mod header;
mod mouse;

#[cfg(test)]
pub(crate) use header::StickyHeader;
pub(crate) use header::{header_jump_data, render_buffer_header};

use crate::{
    BUFFER_HEADER_PADDING, BlockId, ChunkRendererContext, ChunkReplacement, CodeActionSource,
    ConflictsOurs, ConflictsOursMarker, ConflictsOuter, ConflictsTheirs, ConflictsTheirsMarker,
    ContextMenuPlacement, CursorShape, CustomBlockId, DisplayDiffHunk, DisplayPoint, DisplayRow,
    EditDisplayMode, EditPrediction, Editor, EditorMode, EditorSettings, EditorSnapshot,
    EditorStyle, FILE_HEADER_HEIGHT, FocusedBlock, GutterDimensions, HalfPageDown, HalfPageUp,
    HandleInput, HoveredCursor, InlayHintRefreshReason, LineDown, LineHighlight, LineUp,
    MAX_LINE_LEN, MINIMAP_FONT_SIZE, PageDown, PageUp, Point, RowExt, RowRangeExt, Selection,
    SelectionDragState, SizingBehavior, SoftWrap, ToPoint,
    code_context_menus::{CodeActionsMenu, MENU_ASIDE_MAX_WIDTH, MENU_ASIDE_MIN_WIDTH, MENU_GAP},
    column_pixels,
    display_map::{
        Block, BlockContext, BlockStyle, ChunkRendererId, DisplaySnapshot, EditorMargins,
        HighlightKey, HighlightedChunk, ToDisplayPoint,
    },
    editor_settings::{
        CurrentLineHighlight, DocumentColorsRenderMode, Minimap, MinimapThumb, MinimapThumbBorder,
        ScrollBeyondLastLine, ScrollbarAxes, ScrollbarDiagnostics, ShowMinimap,
    },
    git::blame::{BlameRenderer, GitBlame, GlobalBlameRenderer},
    hover_popover::{
        self, HOVER_POPOVER_GAP, MIN_POPOVER_CHARACTER_WIDTH, MIN_POPOVER_LINE_HEIGHT,
        POPOVER_RIGHT_OFFSET,
    },
    inlay_hint_settings,
    scroll::{
        ActiveScrollbarState, ScrollOffset, ScrollPixelOffset, ScrollbarThumbState,
        scroll_amount::ScrollAmount,
    },
};
use buffer_diff::{DiffHunkStatus, DiffHunkStatusKind};
use collections::{BTreeMap, HashMap, HashSet};
use feature_flags::{DiffReviewFeatureFlag, FeatureFlagAppExt as _};
use git::{Oid, blame::BlameEntry, commit::ParsedCommitMessage};
use gpui::{
    Action, Along, AnyElement, App, AppContext, AvailableSpace, Axis as ScrollbarAxis, BorderStyle,
    Bounds, ClipboardItem, ContentMask, Context, Corners, CursorStyle, DispatchPhase, Edges,
    Element, ElementInputHandler, Entity, Focusable as _, Font, FontId, FontWeight,
    GlobalElementId, Hitbox, HitboxBehavior, Hsla, InteractiveElement, IntoElement, IsZero,
    ModifiersChangedEvent, MouseButton, MouseDownEvent, MouseMoveEvent, MouseUpEvent, PaintQuad,
    ParentElement, Pixels, ScrollHandle, ShapedLine, SharedString, Size,
    StatefulInteractiveElement, Style, Styled, StyledText, TaskExt, TextAlign, TextRun,
    TextStyleRefinement, WeakEntity, Window, div, fill, outline, pattern_slash, point, px, quad,
    relative, size, solid_background, transparent_black,
};
use itertools::Itertools;
use language::{
    HighlightedText, IndentGuideSettings, LanguageAwareStyling,
    language_settings::ShowWhitespaceSetting,
};
use markdown::Markdown;
use multi_buffer::{
    Anchor, ExpandExcerptDirection, ExpandInfo, MultiBufferPoint, MultiBufferRow, RowInfo,
};

use project::{
    debugger::breakpoint_store::{Breakpoint, BreakpointSessionState},
    project_settings::ProjectSettings,
};
use settings::{
    GitGutterSetting, GitHunkStyleSetting, IndentGuideBackgroundColoring, IndentGuideColoring,
    Settings,
};
use smallvec::{SmallVec, smallvec};
use std::{
    any::TypeId,
    borrow::Cow,
    cell::Cell,
    cmp::{self, Ordering},
    fmt::{self, Write},
    iter, mem,
    ops::{Deref, Range},
    rc::Rc,
    sync::Arc,
    time::Duration,
};
use sum_tree::Bias;
use text::BufferId;
use theme::{ActiveTheme, Appearance, PlayerColor};
use theme_settings::BufferLineHeight;
use ui::utils::ensure_minimum_contrast;
use ui::{ButtonLike, POPOVER_Y_PADDING, Tooltip, prelude::*, scrollbars::ShowScrollbar};
use unicode_segmentation::UnicodeSegmentation;
use util::{ResultExt, debug_panic};
use workspace::{
    CollaboratorId, ItemHandle, Workspace,
    item::{Item, ItemBufferKind},
};

/// Determines what kinds of highlights should be applied to a lines background.
#[derive(Clone, Copy, Default)]
struct LineHighlightSpec {
    selection: bool,
    breakpoint: bool,
    _active_stack_frame: bool,
}

#[derive(Debug)]
struct SelectionLayout {
    head: DisplayPoint,
    cursor_shape: CursorShape,
    is_newest: bool,
    is_local: bool,
    range: Range<DisplayPoint>,
    active_rows: Range<DisplayRow>,
    user_name: Option<SharedString>,
}

struct InlineBlameLayout {
    element: AnyElement,
    bounds: Bounds<Pixels>,
    buffer_id: BufferId,
    entry: BlameEntry,
}

impl SelectionLayout {
    fn new<T: ToPoint + ToDisplayPoint + Clone>(
        selection: Selection<T>,
        line_mode: bool,
        cursor_offset: bool,
        cursor_shape: CursorShape,
        map: &DisplaySnapshot,
        is_newest: bool,
        is_local: bool,
        user_name: Option<SharedString>,
    ) -> Self {
        let point_selection = selection.map(|p| p.to_point(map.buffer_snapshot()));
        let display_selection = point_selection.map(|p| p.to_display_point(map));
        let mut range = display_selection.range();
        let mut head = display_selection.head();
        let mut active_rows = map.prev_line_boundary(point_selection.start).1.row()
            ..map.next_line_boundary(point_selection.end).1.row();

        // vim visual line mode
        if line_mode {
            let point_range = map.expand_to_line(point_selection.range());
            range = point_range.start.to_display_point(map)..point_range.end.to_display_point(map);
        }

        // any vim visual mode (including line mode)
        if cursor_offset && !range.is_empty() && !selection.reversed {
            if head.column() > 0 {
                head = map.clip_point(DisplayPoint::new(head.row(), head.column() - 1), Bias::Left);
            } else if head.row().0 > 0 && head != map.max_point() {
                head = map.clip_point(
                    DisplayPoint::new(
                        head.row().previous_row(),
                        map.line_len(head.row().previous_row()),
                    ),
                    Bias::Left,
                );
                // updating range.end is a no-op unless you're cursor is
                // on the newline containing a multi-buffer divider
                // in which case the clip_point may have moved the head up
                // an additional row.
                range.end = DisplayPoint::new(head.row().next_row(), 0);
                active_rows.end = head.row();
            }
        }

        Self {
            head,
            cursor_shape,
            is_newest,
            is_local,
            range,
            active_rows,
            user_name,
        }
    }
}

#[derive(Default)]
struct RenderBlocksOutput {
    // We store spacer blocks separately because they paint in a different order
    // (spacers -> indent guides -> non-spacers)
    non_spacer_blocks: Vec<BlockLayout>,
    spacer_blocks: Vec<BlockLayout>,
    row_block_types: HashMap<DisplayRow, bool>,
    resized_blocks: Option<HashMap<CustomBlockId, u32>>,
}

pub struct EditorElement {
    editor: Entity<Editor>,
    style: EditorStyle,
    split_side: Option<SplitSide>,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum SplitSide {
    Left,
    Right,
}

impl EditorElement {
    pub(crate) const SCROLLBAR_WIDTH: Pixels = ui::EDITOR_SCROLLBAR_WIDTH;

    pub fn new(editor: &Entity<Editor>, style: EditorStyle) -> Self {
        Self {
            editor: editor.clone(),
            style,
            split_side: None,
        }
    }

    pub fn set_split_side(&mut self, side: SplitSide) {
        self.split_side = Some(side);
    }

    fn register_actions(&self, window: &mut Window, cx: &mut App) {
        let editor = &self.editor;
        editor.update(cx, |editor, cx| {
            for action in editor.editor_actions.borrow().values() {
                (action)(editor, window, cx)
            }
        });

        crate::rust_analyzer_ext::apply_related_actions(editor, window, cx);
        crate::clangd_ext::apply_related_actions(editor, window, cx);

        register_action(editor, window, Editor::open_context_menu);
        register_action(editor, window, Editor::move_left);
        register_action(editor, window, Editor::move_right);
        register_action(editor, window, Editor::move_down);
        register_action(editor, window, Editor::move_down_by_lines);
        register_action(editor, window, Editor::select_down_by_lines);
        register_action(editor, window, Editor::move_up);
        register_action(editor, window, Editor::move_up_by_lines);
        register_action(editor, window, Editor::select_up_by_lines);
        register_action(editor, window, Editor::select_page_down);
        register_action(editor, window, Editor::select_page_up);
        register_action(editor, window, Editor::cancel);
        register_action(editor, window, Editor::blame_hover);
        register_action(editor, window, Editor::next_snippet_tabstop);
        register_action(editor, window, Editor::previous_snippet_tabstop);
        register_action(editor, window, Editor::copy);
        register_action(editor, window, Editor::copy_and_trim);
        register_action(editor, window, Editor::diff_clipboard_with_selection);
        register_action(editor, window, Editor::move_page_up);
        register_action(editor, window, Editor::move_page_down);
        register_action(editor, window, Editor::next_screen);
        register_action(editor, window, Editor::scroll_cursor_top);
        register_action(editor, window, Editor::scroll_cursor_center);
        register_action(editor, window, Editor::scroll_cursor_bottom);
        register_action(editor, window, Editor::scroll_cursor_center_top_bottom);
        register_action(editor, window, |editor, _: &LineDown, window, cx| {
            editor.scroll_screen(&ScrollAmount::Line(1.), window, cx)
        });
        register_action(editor, window, |editor, _: &LineUp, window, cx| {
            editor.scroll_screen(&ScrollAmount::Line(-1.), window, cx)
        });
        register_action(editor, window, |editor, _: &HalfPageDown, window, cx| {
            editor.scroll_screen(&ScrollAmount::Page(0.5), window, cx)
        });
        register_action(editor, window, |editor, _: &HalfPageUp, window, cx| {
            editor.scroll_screen(&ScrollAmount::Page(-0.5), window, cx)
        });
        register_action(editor, window, |editor, _: &PageDown, window, cx| {
            editor.scroll_screen(&ScrollAmount::Page(1.), window, cx)
        });
        register_action(editor, window, |editor, _: &PageUp, window, cx| {
            editor.scroll_screen(&ScrollAmount::Page(-1.), window, cx)
        });
        register_action(editor, window, Editor::move_to_previous_word_start);
        register_action(editor, window, Editor::move_to_previous_subword_start);
        register_action(editor, window, Editor::move_to_next_word_end);
        register_action(editor, window, Editor::move_to_next_subword_end);
        register_action(editor, window, Editor::move_to_beginning_of_line);
        register_action(editor, window, Editor::move_to_end_of_line);
        register_action(editor, window, Editor::move_to_start_of_paragraph);
        register_action(editor, window, Editor::move_to_end_of_paragraph);
        register_action(editor, window, Editor::move_to_beginning);
        register_action(editor, window, Editor::move_to_end);
        register_action(editor, window, Editor::move_to_start_of_excerpt);
        register_action(editor, window, Editor::move_to_start_of_next_excerpt);
        register_action(editor, window, Editor::move_to_end_of_excerpt);
        register_action(editor, window, Editor::move_to_end_of_previous_excerpt);
        register_action(editor, window, Editor::select_up);
        register_action(editor, window, Editor::select_down);
        register_action(editor, window, Editor::select_left);
        register_action(editor, window, Editor::select_right);
        register_action(editor, window, Editor::select_to_previous_word_start);
        register_action(editor, window, Editor::select_to_previous_subword_start);
        register_action(editor, window, Editor::select_to_next_word_end);
        register_action(editor, window, Editor::select_to_next_subword_end);
        register_action(editor, window, Editor::select_to_beginning_of_line);
        register_action(editor, window, Editor::select_to_end_of_line);
        register_action(editor, window, Editor::select_to_start_of_paragraph);
        register_action(editor, window, Editor::select_to_end_of_paragraph);
        register_action(editor, window, Editor::select_to_start_of_excerpt);
        register_action(editor, window, Editor::select_to_start_of_next_excerpt);
        register_action(editor, window, Editor::select_to_end_of_excerpt);
        register_action(editor, window, Editor::select_to_end_of_previous_excerpt);
        register_action(editor, window, Editor::select_to_beginning);
        register_action(editor, window, Editor::select_to_end);
        register_action(editor, window, Editor::select_all);
        register_action(editor, window, |editor, action, window, cx| {
            editor.select_all_matches(action, window, cx).log_err();
        });
        register_action(editor, window, Editor::select_line);
        register_action(editor, window, Editor::split_selection_into_lines);
        register_action(editor, window, Editor::add_selection_above);
        register_action(editor, window, Editor::add_selection_below);
        register_action(editor, window, Editor::insert_snippet_at_selections);
        register_action(editor, window, |editor, action, window, cx| {
            editor.select_next(action, window, cx).log_err();
        });
        register_action(editor, window, |editor, action, window, cx| {
            editor.select_previous(action, window, cx).log_err();
        });
        register_action(editor, window, |editor, action, window, cx| {
            editor.find_next_match(action, window, cx).log_err();
        });
        register_action(editor, window, |editor, action, window, cx| {
            editor.find_previous_match(action, window, cx).log_err();
        });
        register_action(editor, window, Editor::select_larger_syntax_node);
        register_action(editor, window, Editor::select_smaller_syntax_node);
        register_action(editor, window, Editor::select_next_syntax_node);
        register_action(editor, window, Editor::select_prev_syntax_node);
        register_action(
            editor,
            window,
            Editor::select_to_start_of_larger_syntax_node,
        );
        register_action(editor, window, Editor::select_to_end_of_larger_syntax_node);
        register_action(editor, window, Editor::move_to_start_of_larger_syntax_node);
        register_action(editor, window, Editor::move_to_end_of_larger_syntax_node);
        register_action(editor, window, Editor::select_enclosing_symbol);
        register_action(editor, window, Editor::move_to_enclosing_bracket);
        register_action(editor, window, Editor::undo_selection);
        register_action(editor, window, Editor::redo_selection);
        if editor.read(cx).buffer_kind(cx) == ItemBufferKind::Multibuffer {
            register_action(editor, window, Editor::expand_excerpts);
            register_action(editor, window, Editor::expand_excerpts_up);
            register_action(editor, window, Editor::expand_excerpts_down);
        }
        register_action(editor, window, Editor::go_to_diagnostic);
        register_action(editor, window, Editor::go_to_prev_diagnostic);
        register_action(editor, window, Editor::go_to_next_hunk);
        register_action(editor, window, Editor::go_to_prev_hunk);
        register_action(editor, window, Editor::go_to_next_document_highlight);
        register_action(editor, window, Editor::go_to_prev_document_highlight);
        register_action(editor, window, |editor, action, window, cx| {
            editor
                .go_to_definition(action, window, cx)
                .detach_and_log_err(cx);
        });
        register_action(editor, window, |editor, action, window, cx| {
            editor
                .go_to_definition_split(action, window, cx)
                .detach_and_log_err(cx);
        });
        register_action(editor, window, |editor, action, window, cx| {
            editor
                .go_to_declaration(action, window, cx)
                .detach_and_log_err(cx);
        });
        register_action(editor, window, |editor, action, window, cx| {
            editor
                .go_to_declaration_split(action, window, cx)
                .detach_and_log_err(cx);
        });
        register_action(editor, window, |editor, action, window, cx| {
            editor
                .go_to_implementation(action, window, cx)
                .detach_and_log_err(cx);
        });
        register_action(editor, window, |editor, action, window, cx| {
            editor
                .go_to_implementation_split(action, window, cx)
                .detach_and_log_err(cx);
        });
        register_action(editor, window, |editor, action, window, cx| {
            editor
                .go_to_type_definition(action, window, cx)
                .detach_and_log_err(cx);
        });
        register_action(editor, window, |editor, action, window, cx| {
            editor
                .go_to_type_definition_split(action, window, cx)
                .detach_and_log_err(cx);
        });
        register_action(editor, window, Editor::open_url);
        register_action(editor, window, Editor::open_selected_filename);
        register_action(editor, window, Editor::fold);
        register_action(editor, window, Editor::fold_at_level);
        register_action(editor, window, Editor::fold_at_level_1);
        register_action(editor, window, Editor::fold_at_level_2);
        register_action(editor, window, Editor::fold_at_level_3);
        register_action(editor, window, Editor::fold_at_level_4);
        register_action(editor, window, Editor::fold_at_level_5);
        register_action(editor, window, Editor::fold_at_level_6);
        register_action(editor, window, Editor::fold_at_level_7);
        register_action(editor, window, Editor::fold_at_level_8);
        register_action(editor, window, Editor::fold_at_level_9);
        register_action(editor, window, Editor::fold_all);
        register_action(editor, window, Editor::fold_function_bodies);
        register_action(editor, window, Editor::fold_recursive);
        register_action(editor, window, Editor::toggle_fold);
        register_action(editor, window, Editor::toggle_fold_recursive);
        register_action(editor, window, Editor::toggle_fold_all);
        register_action(editor, window, Editor::unfold_lines);
        register_action(editor, window, Editor::unfold_recursive);
        register_action(editor, window, Editor::unfold_all);
        register_action(editor, window, Editor::fold_selected_ranges);
        register_action(editor, window, Editor::set_mark);
        register_action(editor, window, Editor::save_location);
        register_action(editor, window, Editor::swap_selection_ends);
        register_action(editor, window, Editor::show_completions);
        register_action(editor, window, Editor::show_word_completions);
        register_action(editor, window, Editor::toggle_code_actions);
        register_action(editor, window, Editor::open_excerpts);
        register_action(editor, window, Editor::open_excerpts_in_split);
        register_action(editor, window, Editor::toggle_soft_wrap);
        register_action(editor, window, Editor::toggle_tab_bar);
        register_action(editor, window, Editor::toggle_line_numbers);
        register_action(editor, window, Editor::toggle_relative_line_numbers);
        register_action(editor, window, Editor::toggle_indent_guides);
        register_action(editor, window, Editor::toggle_inlay_hints);
        register_action(editor, window, Editor::toggle_code_lens_action);
        register_action(editor, window, Editor::toggle_semantic_highlights);
        register_action(editor, window, Editor::toggle_edit_predictions);
        if editor.read(cx).diagnostics_enabled() {
            register_action(editor, window, Editor::toggle_diagnostics);
        }
        if editor.read(cx).inline_diagnostics_enabled() {
            register_action(editor, window, Editor::toggle_inline_diagnostics);
        }
        if editor.read(cx).supports_minimap(cx) {
            register_action(editor, window, Editor::toggle_minimap);
        }
        register_action(editor, window, hover_popover::hover);
        register_action(editor, window, Editor::reveal_in_finder);
        register_action(editor, window, Editor::copy_path);
        register_action(editor, window, Editor::copy_relative_path);
        register_action(editor, window, Editor::copy_file_name);
        register_action(editor, window, Editor::copy_file_name_without_extension);
        register_action(editor, window, Editor::copy_highlight_json);
        register_action(editor, window, Editor::copy_permalink_to_line);
        register_action(editor, window, Editor::open_permalink_to_line);
        register_action(editor, window, Editor::copy_file_location);
        register_action(editor, window, Editor::toggle_git_blame);
        register_action(editor, window, Editor::toggle_git_blame_inline);
        register_action(editor, window, Editor::open_git_blame_commit);
        register_action(editor, window, Editor::toggle_selected_diff_hunks);
        register_action(editor, window, Editor::toggle_staged_selected_diff_hunks);
        register_action(editor, window, Editor::stage_and_next);
        register_action(editor, window, Editor::unstage_and_next);
        register_action(editor, window, Editor::expand_all_diff_hunks);
        register_action(editor, window, Editor::collapse_all_diff_hunks);
        register_action(editor, window, Editor::toggle_all_diff_hunks);
        register_action(editor, window, Editor::toggle_review_comments_expanded);
        register_action(editor, window, Editor::submit_diff_review_comment_action);
        register_action(editor, window, Editor::edit_review_comment);
        register_action(editor, window, Editor::delete_review_comment);
        register_action(editor, window, Editor::confirm_edit_review_comment_action);
        register_action(editor, window, Editor::cancel_edit_review_comment_action);
        register_action(editor, window, Editor::go_to_previous_change);
        register_action(editor, window, Editor::go_to_next_change);
        register_action(editor, window, Editor::go_to_prev_reference);
        register_action(editor, window, Editor::go_to_next_reference);
        register_action(editor, window, Editor::go_to_previous_symbol);
        register_action(editor, window, Editor::go_to_next_symbol);
        register_action(editor, window, Editor::restart_language_server);
        register_action(editor, window, Editor::stop_language_server);
        register_action(editor, window, Editor::show_character_palette);
        register_action(editor, window, |editor, action, window, cx| {
            if let Some(task) = editor.compose_completion(action, window, cx) {
                editor.detach_and_notify_err(task, window, cx);
            } else {
                cx.propagate();
            }
        });
        register_action(editor, window, |editor, action, window, cx| {
            if let Some(task) = editor.find_all_references(action, window, cx) {
                task.detach_and_log_err(cx);
            } else {
                cx.propagate();
            }
        });
        register_action(editor, window, Editor::show_signature_help);
        register_action(editor, window, Editor::signature_help_prev);
        register_action(editor, window, Editor::signature_help_next);
        register_action(editor, window, Editor::show_edit_prediction);
        register_action(editor, window, Editor::context_menu_first);
        register_action(editor, window, Editor::context_menu_prev);
        register_action(editor, window, Editor::context_menu_next);
        register_action(editor, window, Editor::context_menu_last);
        register_action(editor, window, Editor::display_cursor_names);
        register_action(editor, window, Editor::open_active_item_in_terminal);
        register_action(editor, window, Editor::spawn_nearest_task);
        register_action(editor, window, Editor::open_selections_in_multibuffer);
        register_action(editor, window, Editor::toggle_bookmark);
        register_action(editor, window, Editor::go_to_next_bookmark);
        register_action(editor, window, Editor::go_to_previous_bookmark);
        register_action(editor, window, Editor::toggle_breakpoint);
        register_action(editor, window, Editor::edit_log_breakpoint);
        register_action(editor, window, Editor::enable_breakpoint);
        register_action(editor, window, Editor::disable_breakpoint);
        register_action(editor, window, Editor::toggle_read_only);
        register_action(editor, window, Editor::reload_file);

        if !editor.read(cx).read_only(cx) {
            register_action(editor, window, Editor::newline);
            register_action(editor, window, Editor::newline_above);
            register_action(editor, window, Editor::newline_below);
            register_action(editor, window, Editor::backspace);
            register_action(editor, window, Editor::delete);
            register_action(editor, window, Editor::tab);
            register_action(editor, window, Editor::backtab);
            register_action(editor, window, Editor::indent);
            register_action(editor, window, Editor::outdent);
            register_action(editor, window, Editor::autoindent);
            register_action(editor, window, Editor::delete_line);
            register_action(editor, window, Editor::join_lines);
            register_action(editor, window, Editor::sort_lines_by_length);
            register_action(editor, window, Editor::sort_lines_case_sensitive);
            register_action(editor, window, Editor::sort_lines_case_insensitive);
            register_action(editor, window, Editor::unique_lines_case_insensitive);
            register_action(editor, window, Editor::unique_lines_case_sensitive);
            register_action(editor, window, Editor::reverse_lines);
            register_action(editor, window, Editor::shuffle_lines);
            register_action(editor, window, Editor::rotate_selections_forward);
            register_action(editor, window, Editor::rotate_selections_backward);
            register_action(editor, window, Editor::convert_indentation_to_spaces);
            register_action(editor, window, Editor::convert_indentation_to_tabs);
            register_action(editor, window, Editor::convert_to_upper_case);
            register_action(editor, window, Editor::convert_to_lower_case);
            register_action(editor, window, Editor::convert_to_title_case);
            register_action(editor, window, Editor::convert_to_snake_case);
            register_action(editor, window, Editor::convert_to_kebab_case);
            register_action(editor, window, Editor::convert_to_upper_camel_case);
            register_action(editor, window, Editor::convert_to_lower_camel_case);
            register_action(editor, window, Editor::convert_to_opposite_case);
            register_action(editor, window, Editor::convert_to_sentence_case);
            register_action(editor, window, Editor::toggle_case);
            register_action(editor, window, Editor::convert_to_rot13);
            register_action(editor, window, Editor::convert_to_rot47);
            register_action(editor, window, Editor::convert_to_base64);
            register_action(editor, window, Editor::convert_from_base64);
            register_action(editor, window, Editor::delete_to_previous_word_start);
            register_action(editor, window, Editor::delete_to_previous_subword_start);
            register_action(editor, window, Editor::delete_to_next_word_end);
            register_action(editor, window, Editor::delete_to_next_subword_end);
            register_action(editor, window, Editor::delete_to_beginning_of_line);
            register_action(editor, window, Editor::delete_to_end_of_line);
            register_action(editor, window, Editor::cut_to_end_of_line);
            register_action(editor, window, Editor::duplicate_line_up);
            register_action(editor, window, Editor::duplicate_line_down);
            register_action(editor, window, Editor::duplicate_selection);
            register_action(editor, window, Editor::move_line_up);
            register_action(editor, window, Editor::move_line_down);
            register_action(editor, window, Editor::transpose);
            register_action(editor, window, |editor, _: &crate::Rewrap, _, cx| {
                editor.rewrap(crate::RewrapOptions::default(), cx);
            });
            register_action(editor, window, Editor::cut);
            register_action(editor, window, Editor::kill_ring_cut);
            register_action(editor, window, Editor::kill_ring_yank);
            register_action(editor, window, Editor::paste);
            register_action(editor, window, Editor::undo);
            register_action(editor, window, Editor::redo);
            register_action(editor, window, Editor::toggle_comments);
            register_action(editor, window, Editor::toggle_block_comments);
            register_action(editor, window, Editor::unwrap_syntax_node);
            register_action(editor, window, Editor::accept_next_word_edit_prediction);
            register_action(editor, window, Editor::accept_next_line_edit_prediction);
            register_action(editor, window, Editor::accept_edit_prediction);
            register_action(editor, window, Editor::restore_file);
            register_action(editor, window, Editor::git_restore);
            register_action(editor, window, Editor::restore_and_next);
            register_action(editor, window, Editor::apply_all_diff_hunks);
            register_action(editor, window, Editor::apply_selected_diff_hunks);
            register_action(editor, window, Editor::insert_uuid_v4);
            register_action(editor, window, Editor::insert_uuid_v7);
            register_action(editor, window, Editor::align_selections);
            if editor.read(cx).enable_wrap_selections_in_tag(cx) {
                register_action(editor, window, Editor::wrap_selections_in_tag);
            }
            register_action(
                editor,
                window,
                |editor, HandleInput(text): &HandleInput, window, cx| {
                    if text.is_empty() {
                        return;
                    }
                    editor.handle_input(text, window, cx);
                },
            );
            register_action(editor, window, |editor, action, window, cx| {
                if let Some(task) = editor.format(action, window, cx) {
                    editor.detach_and_notify_err(task, window, cx);
                } else {
                    cx.propagate();
                }
            });
            if editor.read(cx).can_format_selections(cx) {
                register_action(editor, window, |editor, action, window, cx| {
                    if let Some(task) = editor.format_selections(action, window, cx) {
                        editor.detach_and_notify_err(task, window, cx);
                    } else {
                        cx.propagate();
                    }
                });
            }
            register_action(editor, window, |editor, action, window, cx| {
                if let Some(task) = editor.organize_imports(action, window, cx) {
                    editor.detach_and_notify_err(task, window, cx);
                } else {
                    cx.propagate();
                }
            });
            register_action(editor, window, |editor, action, window, cx| {
                if let Some(task) = editor.confirm_completion(action, window, cx) {
                    editor.detach_and_notify_err(task, window, cx);
                } else {
                    cx.propagate();
                }
            });
            register_action(editor, window, |editor, action, window, cx| {
                if let Some(task) = editor.confirm_completion_replace(action, window, cx) {
                    editor.detach_and_notify_err(task, window, cx);
                } else {
                    cx.propagate();
                }
            });
            register_action(editor, window, |editor, action, window, cx| {
                if let Some(task) = editor.confirm_completion_insert(action, window, cx) {
                    editor.detach_and_notify_err(task, window, cx);
                } else {
                    cx.propagate();
                }
            });
            register_action(editor, window, |editor, action, window, cx| {
                if let Some(task) = editor.confirm_code_action(action, window, cx) {
                    editor.detach_and_notify_err(task, window, cx);
                } else {
                    cx.propagate();
                }
            });
            register_action(editor, window, |editor, action, window, cx| {
                if let Some(task) = editor.rename(action, window, cx) {
                    editor.detach_and_notify_err(task, window, cx);
                } else {
                    cx.propagate();
                }
            });
            register_action(editor, window, |editor, action, window, cx| {
                if let Some(task) = editor.confirm_rename(action, window, cx) {
                    editor.detach_and_notify_err(task, window, cx);
                } else {
                    cx.propagate();
                }
            });
        }
    }

    fn register_key_listeners(&self, window: &mut Window, _: &mut App, layout: &EditorLayout) {
        let position_map = layout.position_map.clone();
        window.on_key_event({
            let editor = self.editor.clone();
            move |event: &ModifiersChangedEvent, phase, window, cx| {
                if phase != DispatchPhase::Bubble {
                    return;
                }
                editor.update(cx, |editor, cx| {
                    let inlay_hint_settings = inlay_hint_settings(
                        editor.selections.newest_anchor().head(),
                        &editor.buffer.read(cx).snapshot(cx),
                        cx,
                    );

                    if let Some(inlay_modifiers) = inlay_hint_settings
                        .toggle_on_modifiers_press
                        .as_ref()
                        .filter(|modifiers| modifiers.modified())
                    {
                        editor.refresh_inlay_hints(
                            InlayHintRefreshReason::ModifiersChanged(
                                inlay_modifiers == &event.modifiers,
                            ),
                            cx,
                        );
                    }

                    if editor.hover_state.focused(window, cx) {
                        return;
                    }

                    editor.handle_modifiers_changed(event.modifiers, &position_map, window, cx);
                })
            }
        });
    }

    fn layout_selections(
        &self,
        start_anchor: Anchor,
        end_anchor: Anchor,
        local_selections: &[Selection<Point>],
        snapshot: &EditorSnapshot,
        start_row: DisplayRow,
        end_row: DisplayRow,
        window: &mut Window,
        cx: &mut App,
    ) -> (
        Vec<(PlayerColor, Vec<SelectionLayout>)>,
        BTreeMap<DisplayRow, LineHighlightSpec>,
        Option<DisplayPoint>,
    ) {
        let mut selections: Vec<(PlayerColor, Vec<SelectionLayout>)> = Vec::new();
        let mut active_rows = BTreeMap::new();
        let mut newest_selection_head = None;

        let Some(editor_with_selections) = self.editor_with_selections(cx) else {
            return (selections, active_rows, newest_selection_head);
        };

        editor_with_selections.update(cx, |editor, cx| {
            if editor.show_local_selections {
                let mut layouts = Vec::new();
                let newest = editor.selections.newest(&editor.display_snapshot(cx));
                for selection in local_selections.iter().cloned() {
                    let is_empty = selection.start == selection.end;
                    let is_newest = selection == newest;

                    let layout = SelectionLayout::new(
                        selection,
                        editor.selections.line_mode(),
                        editor.cursor_offset_on_selection,
                        editor.cursor_shape,
                        &snapshot.display_snapshot,
                        is_newest,
                        editor.leader_id.is_none(),
                        None,
                    );
                    if is_newest {
                        newest_selection_head = Some(layout.head);
                    }

                    for row in cmp::max(layout.active_rows.start.0, start_row.0)
                        ..=cmp::min(layout.active_rows.end.0, end_row.0)
                    {
                        let contains_non_empty_selection = active_rows
                            .entry(DisplayRow(row))
                            .or_insert_with(LineHighlightSpec::default);
                        contains_non_empty_selection.selection |= !is_empty;
                    }
                    layouts.push(layout);
                }

                let mut player = editor.current_user_player_color(cx);
                if !editor.is_focused(window) {
                    const UNFOCUS_EDITOR_SELECTION_OPACITY: f32 = 0.5;
                    player.selection = player.selection.opacity(UNFOCUS_EDITOR_SELECTION_OPACITY);
                }
                selections.push((player, layouts));

                if let SelectionDragState::Dragging {
                    ref selection,
                    ref drop_cursor,
                    ref hide_drop_cursor,
                } = editor.selection_drag_state
                    && !hide_drop_cursor
                    && (drop_cursor
                        .start
                        .cmp(&selection.start, &snapshot.buffer_snapshot())
                        .eq(&Ordering::Less)
                        || drop_cursor
                            .end
                            .cmp(&selection.end, &snapshot.buffer_snapshot())
                            .eq(&Ordering::Greater))
                {
                    let drag_cursor_layout = SelectionLayout::new(
                        drop_cursor.clone(),
                        false,
                        editor.cursor_offset_on_selection,
                        CursorShape::Bar,
                        &snapshot.display_snapshot,
                        false,
                        false,
                        None,
                    );
                    let absent_color = cx.theme().players().absent();
                    selections.push((absent_color, vec![drag_cursor_layout]));
                }
            }

            if let Some(collaboration_hub) = &editor.collaboration_hub {
                // When following someone, render the local selections in their color.
                if let Some(leader_id) = editor.leader_id {
                    match leader_id {
                        CollaboratorId::PeerId(peer_id) => {
                            if let Some(collaborator) =
                                collaboration_hub.collaborators(cx).get(&peer_id)
                                && let Some(participant_index) = collaboration_hub
                                    .user_participant_indices(cx)
                                    .get(&collaborator.user_id)
                                && let Some((local_selection_style, _)) = selections.first_mut()
                            {
                                *local_selection_style = cx
                                    .theme()
                                    .players()
                                    .color_for_participant(participant_index.0);
                            }
                        }
                        CollaboratorId::Agent => {
                            if let Some((local_selection_style, _)) = selections.first_mut() {
                                *local_selection_style = cx.theme().players().agent();
                            }
                        }
                    }
                }

                let mut remote_selections = HashMap::default();
                for selection in snapshot.remote_selections_in_range(
                    &(start_anchor..end_anchor),
                    collaboration_hub.as_ref(),
                    cx,
                ) {
                    // Don't re-render the leader's selections, since the local selections
                    // match theirs.
                    if Some(selection.collaborator_id) == editor.leader_id {
                        continue;
                    }
                    let key = HoveredCursor {
                        replica_id: selection.replica_id,
                        selection_id: selection.selection.id,
                    };

                    let is_shown =
                        editor.show_cursor_names || editor.hovered_cursors.contains_key(&key);

                    remote_selections
                        .entry(selection.replica_id)
                        .or_insert((selection.color, Vec::new()))
                        .1
                        .push(SelectionLayout::new(
                            selection.selection,
                            selection.line_mode,
                            editor.cursor_offset_on_selection,
                            selection.cursor_shape,
                            &snapshot.display_snapshot,
                            false,
                            false,
                            if is_shown { selection.user_name } else { None },
                        ));
                }

                selections.extend(remote_selections.into_values());
            } else if !editor.is_focused(window) && editor.show_cursor_when_unfocused {
                let cursor_offset_on_selection = editor.cursor_offset_on_selection;

                let layouts = snapshot
                    .buffer_snapshot()
                    .selections_in_range(&(start_anchor..end_anchor), true)
                    .map(move |(_, line_mode, cursor_shape, selection)| {
                        SelectionLayout::new(
                            selection,
                            line_mode,
                            cursor_offset_on_selection,
                            cursor_shape,
                            &snapshot.display_snapshot,
                            false,
                            false,
                            None,
                        )
                    })
                    .collect::<Vec<_>>();
                let player = editor.current_user_player_color(cx);
                selections.push((player, layouts));
            }
        });

        #[cfg(debug_assertions)]
        Self::layout_debug_ranges(
            &mut selections,
            start_anchor..end_anchor,
            &snapshot.display_snapshot,
            cx,
        );

        (selections, active_rows, newest_selection_head)
    }

    fn collect_cursors(
        &self,
        snapshot: &EditorSnapshot,
        cx: &mut App,
    ) -> Vec<(DisplayPoint, Hsla)> {
        let editor = self.editor.read(cx);
        let mut cursors = Vec::new();
        let mut skip_local = false;
        let mut add_cursor = |anchor: Anchor, color| {
            cursors.push((anchor.to_display_point(&snapshot.display_snapshot), color));
        };
        // Remote cursors
        if let Some(collaboration_hub) = &editor.collaboration_hub {
            for remote_selection in snapshot.remote_selections_in_range(
                &(Anchor::Min..Anchor::Max),
                collaboration_hub.deref(),
                cx,
            ) {
                add_cursor(
                    remote_selection.selection.head(),
                    remote_selection.color.cursor,
                );
                if Some(remote_selection.collaborator_id) == editor.leader_id {
                    skip_local = true;
                }
            }
        }
        // Local cursors
        if !skip_local {
            let color = cx.theme().players().local().cursor;
            editor
                .selections
                .disjoint_anchors()
                .iter()
                .for_each(|selection| {
                    add_cursor(selection.head(), color);
                });
            if let Some(ref selection) = editor.selections.pending_anchor() {
                add_cursor(selection.head(), color);
            }
        }
        cursors
    }

    fn layout_visible_cursors(
        &self,
        snapshot: &EditorSnapshot,
        selections: &[(PlayerColor, Vec<SelectionLayout>)],
        row_block_types: &HashMap<DisplayRow, bool>,
        visible_display_row_range: Range<DisplayRow>,
        line_layouts: &[LineWithInvisibles],
        text_hitbox: &Hitbox,
        content_origin: gpui::Point<Pixels>,
        scroll_position: gpui::Point<ScrollOffset>,
        scroll_pixel_position: gpui::Point<ScrollPixelOffset>,
        line_height: Pixels,
        em_width: Pixels,
        em_advance: Pixels,
        autoscroll_containing_element: bool,
        redacted_ranges: &[Range<DisplayPoint>],
        window: &mut Window,
        cx: &mut App,
    ) -> Vec<CursorLayout> {
        let mut autoscroll_bounds = None;
        let cursor_layouts = self.editor.update(cx, |editor, cx| {
            let mut cursors = Vec::new();

            let show_local_cursors = editor.show_local_cursors(window, cx);

            for (player_color, selections) in selections {
                for selection in selections {
                    let cursor_position = selection.head;

                    let in_range = visible_display_row_range.contains(&cursor_position.row());
                    if (selection.is_local && !show_local_cursors)
                        || !in_range
                        || row_block_types.get(&cursor_position.row()) == Some(&true)
                    {
                        continue;
                    }

                    let cursor_row_layout = &line_layouts
                        [cursor_position.row().minus(visible_display_row_range.start) as usize];
                    let cursor_column = cursor_position.column() as usize;

                    let cursor_character_x = cursor_row_layout.x_for_index(cursor_column)
                        + cursor_row_layout
                            .alignment_offset(self.style.text.text_align, text_hitbox.size.width);
                    let cursor_next_x = cursor_row_layout.x_for_index(cursor_column + 1)
                        + cursor_row_layout
                            .alignment_offset(self.style.text.text_align, text_hitbox.size.width);
                    let mut cell_width = cursor_next_x - cursor_character_x;
                    if cell_width == Pixels::ZERO {
                        cell_width = em_advance;
                    }

                    let mut block_width = cell_width;
                    let mut block_text = None;

                    let is_cursor_in_redacted_range = redacted_ranges
                        .iter()
                        .any(|range| range.start <= cursor_position && cursor_position < range.end);

                    if selection.cursor_shape == CursorShape::Block && !is_cursor_in_redacted_range
                    {
                        if let Some(text) = snapshot.grapheme_at(cursor_position).or_else(|| {
                            if snapshot.is_empty() {
                                snapshot.placeholder_text().and_then(|s| {
                                    s.graphemes(true).next().map(|s| s.to_string().into())
                                })
                            } else {
                                None
                            }
                        }) {
                            let is_ascii_whitespace_only =
                                text.as_ref().chars().all(|c| c.is_ascii_whitespace());
                            let len = text.len();

                            let mut font = cursor_row_layout
                                .font_id_for_index(cursor_column)
                                .and_then(|cursor_font_id| {
                                    window.text_system().get_font_for_id(cursor_font_id)
                                })
                                .unwrap_or(self.style.text.font());
                            font.features = self.style.text.font_features.clone();

                            // Invert the text color for the block cursor. Ensure that the text
                            // color is opaque enough to be visible against the background color.
                            //
                            // 0.75 is an arbitrary threshold to determine if the background color is
                            // opaque enough to use as a text color.
                            //
                            // TODO: In the future we should ensure themes have a `text_inverse` color.
                            let color = if cx.theme().colors().editor_background.a < 0.75 {
                                match cx.theme().appearance {
                                    Appearance::Dark => Hsla::black(),
                                    Appearance::Light => Hsla::white(),
                                }
                            } else {
                                cx.theme().colors().editor_background
                            };

                            let shaped = window.text_system().shape_line(
                                text,
                                cursor_row_layout.font_size,
                                &[TextRun {
                                    len,
                                    font,
                                    color,
                                    ..Default::default()
                                }],
                                None,
                            );
                            if !is_ascii_whitespace_only {
                                block_width = block_width.max(shaped.width);
                            }
                            block_text = Some(shaped);
                        }
                    }

                    let x = cursor_character_x - scroll_pixel_position.x.into();
                    let y = ((cursor_position.row().as_f64() - scroll_position.y)
                        * ScrollPixelOffset::from(line_height))
                    .into();
                    if selection.is_newest {
                        editor.pixel_position_of_newest_cursor = Some(point(
                            text_hitbox.origin.x + x + block_width / 2.,
                            text_hitbox.origin.y + y + line_height / 2.,
                        ));

                        if autoscroll_containing_element {
                            let top = text_hitbox.origin.y
                                + ((cursor_position.row().as_f64() - scroll_position.y - 3.)
                                    .max(0.)
                                    * ScrollPixelOffset::from(line_height))
                                .into();
                            let left = text_hitbox.origin.x
                                + ((cursor_position.column() as ScrollOffset
                                    - scroll_position.x
                                    - 3.)
                                    .max(0.)
                                    * ScrollPixelOffset::from(em_width))
                                .into();

                            let bottom = text_hitbox.origin.y
                                + ((cursor_position.row().as_f64() - scroll_position.y + 4.)
                                    * ScrollPixelOffset::from(line_height))
                                .into();
                            let right = text_hitbox.origin.x
                                + ((cursor_position.column() as ScrollOffset - scroll_position.x
                                    + 4.)
                                    * ScrollPixelOffset::from(em_width))
                                .into();

                            autoscroll_bounds =
                                Some(Bounds::from_corners(point(left, top), point(right, bottom)))
                        }
                    }

                    let mut cursor = CursorLayout {
                        color: player_color.cursor,
                        block_width,
                        origin: point(x, y),
                        line_height,
                        shape: selection.cursor_shape,
                        block_text,
                        cursor_name: None,
                    };
                    let cursor_name = selection.user_name.clone().map(|name| CursorName {
                        string: name,
                        color: self.style.background,
                        is_top_row: cursor_position.row().0 == 0,
                    });
                    cursor.layout(content_origin, cursor_name, window, cx);
                    cursors.push(cursor);
                }
            }

            cursors
        });

        if let Some(bounds) = autoscroll_bounds {
            window.request_autoscroll(bounds);
        }

        cursor_layouts
    }

    fn layout_navigation_overlays(
        &self,
        snapshot: &EditorSnapshot,
        visible_display_row_range: Range<DisplayRow>,
        line_layouts: &[LineWithInvisibles],
        text_hitbox: &Hitbox,
        content_origin: gpui::Point<Pixels>,
        scroll_position: gpui::Point<ScrollOffset>,
        scroll_pixel_position: gpui::Point<ScrollPixelOffset>,
        line_height: Pixels,
        window: &mut Window,
        cx: &mut App,
    ) -> Vec<NavigationOverlayPaintCommand> {
        let mut overlay_sets = self
            .editor
            .read(cx)
            .navigation_overlay_sets()
            .iter()
            .map(|(key, overlays)| (*key, overlays.clone()))
            .collect::<Vec<_>>();
        if overlay_sets.is_empty() {
            return Vec::new();
        }
        overlay_sets.sort_by_key(|(key, _)| *key);

        let layout_context = NavigationOverlayLayoutContext {
            display_snapshot: &snapshot.display_snapshot,
            visible_display_row_range: &visible_display_row_range,
            line_layouts,
            text_align: self.style.text.text_align,
            content_width: text_hitbox.size.width,
            content_origin,
            scroll_position,
            scroll_pixel_position,
            line_height,
            editor_font: self.style.text.font(),
            editor_font_size: self.style.text.font_size.to_pixels(window.rem_size()),
        };
        let mut navigation_overlay_paint_commands = Vec::new();

        for (_, overlays) in overlay_sets {
            for overlay in overlays.as_ref() {
                Self::layout_navigation_label(
                    overlay,
                    &layout_context,
                    window,
                    cx,
                    &mut navigation_overlay_paint_commands,
                );
            }
        }

        navigation_overlay_paint_commands
    }

    fn layout_navigation_label(
        overlay: &crate::NavigationTargetOverlay,
        context: &NavigationOverlayLayoutContext<'_>,
        window: &mut Window,
        cx: &mut App,
        paint_commands: &mut Vec<NavigationOverlayPaintCommand>,
    ) {
        let label = &overlay.label;
        let label_display_point = overlay
            .target_range
            .start
            .to_display_point(context.display_snapshot);
        let label_row = label_display_point.row();
        if !context.visible_display_row_range.contains(&label_row) {
            return;
        }

        let row_index = label_row.minus(context.visible_display_row_range.start) as usize;
        let row_layout = &context.line_layouts[row_index];
        let label_column = label_display_point.column().min(row_layout.len as u32) as usize;
        let label_x = row_layout.x_for_index(label_column)
            + row_layout.alignment_offset(context.text_align, context.content_width)
            - context.scroll_pixel_position.x.into()
            + label.x_offset;
        let label_y = ((label_row.as_f64() - context.scroll_position.y)
            * ScrollPixelOffset::from(context.line_height))
        .into();
        let label_text_size = (context.editor_font_size * label.scale_factor.max(0.0)).max(px(1.0));
        let origin = context.content_origin + point(label_x, label_y);

        let mut element = div()
            .block_mouse_except_scroll()
            .font(context.editor_font.clone())
            .text_size(label_text_size)
            .text_color(label.text_color)
            .line_height(context.line_height)
            .child(label.text.clone())
            .into_any_element();
        element.prepaint_as_root(origin, AvailableSpace::min_size(), window, cx);

        paint_commands.push(NavigationOverlayPaintCommand::Label(
            NavigationLabelLayout { element, origin },
        ));
    }

    fn layout_scrollbars(
        &self,
        snapshot: &EditorSnapshot,
        scrollbar_layout_information: &ScrollbarLayoutInformation,
        content_offset: gpui::Point<Pixels>,
        scroll_position: gpui::Point<ScrollOffset>,
        non_visible_cursors: bool,
        right_margin: Pixels,
        editor_width: Pixels,
        window: &mut Window,
        cx: &mut App,
    ) -> Option<EditorScrollbars> {
        let show_scrollbars = self.editor.read(cx).show_scrollbars;
        if (!show_scrollbars.horizontal && !show_scrollbars.vertical)
            || self.style.scrollbar_width.is_zero()
        {
            return None;
        }

        // If a drag took place after we started dragging the scrollbar,
        // cancel the scrollbar drag.
        if cx.has_active_drag() {
            self.editor.update(cx, |editor, cx| {
                editor.scroll_manager.reset_scrollbar_state(cx)
            });
        }

        let editor_settings = EditorSettings::get_global(cx);
        let scrollbar_settings = editor_settings.scrollbar;
        let show_scrollbars = match scrollbar_settings.show {
            ShowScrollbar::Auto => {
                let editor = self.editor.read(cx);
                let is_singleton = editor.buffer_kind(cx) == ItemBufferKind::Singleton;
                // Git
                (is_singleton && scrollbar_settings.git_diff && snapshot.buffer_snapshot().has_diff_hunks())
                ||
                // Buffer Search Results
                (is_singleton && scrollbar_settings.search_results && editor.has_background_highlights(HighlightKey::BufferSearchHighlights))
                ||
                // Selected Text Occurrences
                (is_singleton && scrollbar_settings.selected_text && editor.has_background_highlights(HighlightKey::SelectedTextHighlight))
                ||
                // Selected Symbol Occurrences
                (is_singleton && scrollbar_settings.selected_symbol && (editor.has_background_highlights(HighlightKey::DocumentHighlightRead) || editor.has_background_highlights(HighlightKey::DocumentHighlightWrite)))
                ||
                // Diagnostics
                (is_singleton && scrollbar_settings.diagnostics != ScrollbarDiagnostics::None && snapshot.buffer_snapshot().has_diagnostics())
                ||
                // Cursors out of sight
                non_visible_cursors
                ||
                // Scrollmanager
                editor.scroll_manager.scrollbars_visible()
            }
            ShowScrollbar::System => self.editor.read(cx).scroll_manager.scrollbars_visible(),
            ShowScrollbar::Always => true,
            ShowScrollbar::Never => return None,
        };

        // The horizontal scrollbar is usually slightly offset to align nicely with
        // indent guides. However, this offset is not needed if indent guides are
        // disabled for the current editor.
        let content_offset = self
            .editor
            .read(cx)
            .show_indent_guides
            .is_none_or(|should_show| should_show)
            .then_some(content_offset)
            .unwrap_or_default();

        Some(EditorScrollbars::from_scrollbar_axes(
            ScrollbarAxes {
                horizontal: scrollbar_settings.axes.horizontal
                    && self.editor.read(cx).show_scrollbars.horizontal,
                vertical: scrollbar_settings.axes.vertical
                    && self.editor.read(cx).show_scrollbars.vertical,
            },
            scrollbar_layout_information,
            content_offset,
            scroll_position,
            self.style.scrollbar_width,
            right_margin,
            editor_width,
            show_scrollbars,
            self.editor.read(cx).scroll_manager.active_scrollbar_state(),
            window,
        ))
    }

    fn layout_minimap(
        &self,
        snapshot: &EditorSnapshot,
        minimap_width: Pixels,
        scroll_position: gpui::Point<f64>,
        scrollbar_layout_information: &ScrollbarLayoutInformation,
        scrollbar_layout: Option<&EditorScrollbars>,
        window: &mut Window,
        cx: &mut App,
    ) -> Option<MinimapLayout> {
        let minimap_editor = self.editor.read(cx).minimap().cloned()?;

        let minimap_settings = EditorSettings::get_global(cx).minimap;

        if minimap_settings.on_active_editor() {
            let active_editor = self.editor.read(cx).workspace().and_then(|ws| {
                ws.read(cx)
                    .active_pane()
                    .read(cx)
                    .active_item()
                    .and_then(|i| i.act_as::<Editor>(cx))
            });
            if active_editor.is_some_and(|e| e != self.editor) {
                return None;
            }
        }

        if !snapshot.mode.is_full()
            || minimap_width.is_zero()
            || matches!(
                minimap_settings.show,
                ShowMinimap::Auto if scrollbar_layout.is_none_or(|layout| !layout.visible)
            )
        {
            return None;
        }

        const MINIMAP_AXIS: ScrollbarAxis = ScrollbarAxis::Vertical;

        let ScrollbarLayoutInformation {
            editor_bounds,
            scroll_range,
            glyph_grid_cell,
        } = scrollbar_layout_information;

        let line_height = glyph_grid_cell.height;
        let scroll_position = scroll_position.along(MINIMAP_AXIS);

        let top_right_anchor = scrollbar_layout
            .and_then(|layout| layout.vertical.as_ref())
            .map(|vertical_scrollbar| vertical_scrollbar.hitbox.origin)
            .unwrap_or_else(|| editor_bounds.top_right());

        let thumb_state = self
            .editor
            .read_with(cx, |editor, _| editor.scroll_manager.minimap_thumb_state());

        let show_thumb = match minimap_settings.thumb {
            MinimapThumb::Always => true,
            MinimapThumb::Hover => thumb_state.is_some(),
        };

        let minimap_bounds = Bounds::from_anchor_and_size(
            gpui::Anchor::TopRight,
            top_right_anchor,
            size(minimap_width, editor_bounds.size.height),
        );
        let minimap_line_height = self.get_minimap_line_height(
            minimap_editor
                .read(cx)
                .text_style_refinement
                .as_ref()
                .and_then(|refinement| refinement.font_size)
                .unwrap_or(MINIMAP_FONT_SIZE),
            window,
            cx,
        );
        let minimap_height = minimap_bounds.size.height;

        let visible_editor_lines = (editor_bounds.size.height / line_height) as f64;
        let total_editor_lines = (scroll_range.height / line_height) as f64;
        let minimap_lines = (minimap_height / minimap_line_height) as f64;

        let minimap_scroll_top = MinimapLayout::calculate_minimap_top_offset(
            total_editor_lines,
            visible_editor_lines,
            minimap_lines,
            scroll_position,
        );

        let layout = ScrollbarLayout::for_minimap(
            window.insert_hitbox(minimap_bounds, HitboxBehavior::Normal),
            visible_editor_lines,
            total_editor_lines,
            minimap_line_height,
            scroll_position,
            minimap_scroll_top,
            show_thumb,
        )
        .with_thumb_state(thumb_state);

        minimap_editor.update(cx, |editor, cx| {
            editor.set_scroll_position(point(0., minimap_scroll_top), window, cx)
        });

        // Required for the drop shadow to be visible
        const PADDING_OFFSET: Pixels = px(4.);

        let mut minimap = div()
            .size_full()
            .shadow_xs()
            .px(PADDING_OFFSET)
            .child(minimap_editor)
            .into_any_element();

        let extended_bounds = minimap_bounds.extend(Edges {
            right: PADDING_OFFSET,
            left: PADDING_OFFSET,
            ..Default::default()
        });
        minimap.layout_as_root(extended_bounds.size.into(), window, cx);
        window.with_absolute_element_offset(extended_bounds.origin, |window| {
            minimap.prepaint(window, cx)
        });

        Some(MinimapLayout {
            minimap,
            thumb_layout: layout,
            thumb_border_style: minimap_settings.thumb_border,
            minimap_line_height,
            minimap_scroll_top,
            max_scroll_top: total_editor_lines,
        })
    }

    fn get_minimap_line_height(
        &self,
        font_size: AbsoluteLength,
        window: &mut Window,
        cx: &mut App,
    ) -> Pixels {
        let rem_size = self.rem_size(cx).unwrap_or(window.rem_size());
        let mut text_style = self.style.text.clone();
        text_style.font_size = font_size;
        text_style.line_height_in_pixels(rem_size)
    }

    fn get_minimap_width(
        &self,
        minimap_settings: &Minimap,
        scrollbars_shown: bool,
        text_width: Pixels,
        em_width: Pixels,
        font_size: Pixels,
        rem_size: Pixels,
        cx: &App,
    ) -> Option<Pixels> {
        if minimap_settings.show == ShowMinimap::Auto && !scrollbars_shown {
            return None;
        }

        let minimap_font_size = self.editor.read_with(cx, |editor, cx| {
            editor.minimap().map(|minimap_editor| {
                minimap_editor
                    .read(cx)
                    .text_style_refinement
                    .as_ref()
                    .and_then(|refinement| refinement.font_size)
                    .unwrap_or(MINIMAP_FONT_SIZE)
            })
        })?;

        let minimap_em_width = em_width * (minimap_font_size.to_pixels(rem_size) / font_size);

        let minimap_width = (text_width * MinimapLayout::MINIMAP_WIDTH_PCT)
            .min(minimap_em_width * minimap_settings.max_width_columns.get() as f32);

        (minimap_width >= minimap_em_width * MinimapLayout::MINIMAP_MIN_WIDTH_COLUMNS)
            .then_some(minimap_width)
    }

    fn prepaint_crease_toggles(
        &self,
        crease_toggles: &mut [Option<AnyElement>],
        line_height: Pixels,
        gutter_dimensions: &GutterDimensions,
        gutter_settings: crate::editor_settings::Gutter,
        scroll_position: gpui::Point<ScrollOffset>,
        start_row: DisplayRow,
        gutter_hitbox: &Hitbox,
        window: &mut Window,
        cx: &mut App,
    ) {
        for (ix, crease_toggle) in crease_toggles.iter_mut().enumerate() {
            if let Some(crease_toggle) = crease_toggle {
                debug_assert!(gutter_settings.folds);
                let available_space = size(
                    AvailableSpace::MinContent,
                    AvailableSpace::Definite(line_height * 0.55),
                );
                let crease_toggle_size = crease_toggle.layout_as_root(available_space, window, cx);

                let display_row = DisplayRow(start_row.0 + ix as u32);
                let position = point(
                    gutter_dimensions.width - gutter_dimensions.right_padding,
                    line_height * (display_row.as_f64() - scroll_position.y) as f32,
                );
                let centering_offset = point(
                    (gutter_dimensions.fold_area_width() - crease_toggle_size.width) / 2.,
                    (line_height - crease_toggle_size.height) / 2.,
                );
                let origin = gutter_hitbox.origin + position + centering_offset;
                crease_toggle.prepaint_as_root(origin, available_space, window, cx);
            }
        }
    }

    fn prepaint_expand_toggles(
        &self,
        expand_toggles: &mut [Option<(AnyElement, gpui::Point<Pixels>)>],
        window: &mut Window,
        cx: &mut App,
    ) {
        for (expand_toggle, origin) in expand_toggles.iter_mut().flatten() {
            let available_space = size(AvailableSpace::MinContent, AvailableSpace::MinContent);
            expand_toggle.layout_as_root(available_space, window, cx);
            expand_toggle.prepaint_as_root(*origin, available_space, window, cx);
        }
    }

    fn prepaint_crease_trailers(
        &self,
        trailers: Vec<Option<AnyElement>>,
        lines: &[LineWithInvisibles],
        line_height: Pixels,
        content_origin: gpui::Point<Pixels>,
        scroll_pixel_position: gpui::Point<ScrollPixelOffset>,
        scroll_position: gpui::Point<ScrollOffset>,
        start_row: DisplayRow,
        em_width: Pixels,
        window: &mut Window,
        cx: &mut App,
    ) -> Vec<Option<CreaseTrailerLayout>> {
        trailers
            .into_iter()
            .enumerate()
            .map(|(ix, element)| {
                let mut element = element?;
                let available_space = size(
                    AvailableSpace::MinContent,
                    AvailableSpace::Definite(line_height),
                );
                let size = element.layout_as_root(available_space, window, cx);

                let line = &lines[ix];
                let padding = if line.width == Pixels::ZERO {
                    Pixels::ZERO
                } else {
                    4. * em_width
                };
                let position = point(
                    Pixels::from(scroll_pixel_position.x) + line.width + padding,
                    line_height
                        * (DisplayRow(start_row.0 + ix as u32).as_f64() - scroll_position.y) as f32,
                );
                let centering_offset = point(px(0.), (line_height - size.height) / 2.);
                let origin = content_origin + position + centering_offset;
                element.prepaint_as_root(origin, available_space, window, cx);
                Some(CreaseTrailerLayout {
                    element,
                    bounds: Bounds::new(origin, size),
                })
            })
            .collect()
    }

    // Folds contained in a hunk are ignored apart from shrinking visual size
    // If a fold contains any hunks then that fold line is marked as modified
    fn layout_gutter_diff_hunks(
        &self,
        line_height: Pixels,
        gutter_hitbox: &Hitbox,
        display_rows: Range<DisplayRow>,
        snapshot: &EditorSnapshot,
        scroll_position: gpui::Point<ScrollOffset>,
        window: &mut Window,
        cx: &mut App,
    ) -> Vec<(DisplayDiffHunk, Option<Hitbox>)> {
        let folded_buffers = self.editor.read(cx).folded_buffers(cx);
        let mut display_hunks = snapshot
            .display_diff_hunks_for_rows(display_rows, folded_buffers)
            .map(|hunk| (hunk, None))
            .collect::<Vec<_>>();
        let git_gutter_setting = ProjectSettings::get_global(cx).git.git_gutter;
        if let GitGutterSetting::TrackedFiles = git_gutter_setting {
            for (hunk, hitbox) in &mut display_hunks {
                if matches!(hunk, DisplayDiffHunk::Unfolded { .. }) {
                    let hunk_bounds = Self::diff_hunk_bounds(
                        scroll_position,
                        line_height,
                        gutter_hitbox.bounds,
                        hunk,
                        snapshot,
                    );
                    *hitbox = Some(window.insert_hitbox(hunk_bounds, HitboxBehavior::BlockMouse));
                }
            }
        }

        display_hunks
    }

    fn layout_inline_diagnostics(
        &self,
        line_layouts: &[LineWithInvisibles],
        crease_trailers: &[Option<CreaseTrailerLayout>],
        row_block_types: &HashMap<DisplayRow, bool>,
        content_origin: gpui::Point<Pixels>,
        scroll_position: gpui::Point<ScrollOffset>,
        scroll_pixel_position: gpui::Point<ScrollPixelOffset>,
        edit_prediction_popover_origin: Option<gpui::Point<Pixels>>,
        start_row: DisplayRow,
        end_row: DisplayRow,
        line_height: Pixels,
        em_width: Pixels,
        style: &EditorStyle,
        window: &mut Window,
        cx: &mut App,
    ) -> HashMap<DisplayRow, AnyElement> {
        let max_severity = match self
            .editor
            .read(cx)
            .inline_diagnostics_enabled()
            .then(|| {
                ProjectSettings::get_global(cx)
                    .diagnostics
                    .inline
                    .max_severity
                    .unwrap_or_else(|| self.editor.read(cx).diagnostics_max_severity)
                    .into_lsp()
            })
            .flatten()
        {
            Some(max_severity) => max_severity,
            None => return HashMap::default(),
        };

        let active_diagnostics_group = self.editor.read(cx).active_diagnostic_group_id();

        let diagnostics_by_rows = self.editor.update(cx, |editor, cx| {
            let snapshot = editor.snapshot(window, cx);
            editor
                .inline_diagnostics
                .iter()
                .filter(|(_, diagnostic)| diagnostic.severity <= max_severity)
                .filter(|(_, diagnostic)| match active_diagnostics_group {
                    Some(active_diagnostics_group) => {
                        // Active diagnostics are all shown in the editor already, no need to display them inline
                        diagnostic.group_id != active_diagnostics_group
                    }
                    None => true,
                })
                .map(|(point, diag)| (point.to_display_point(&snapshot), diag.clone()))
                .skip_while(|(point, _)| point.row() < start_row)
                .take_while(|(point, _)| point.row() < end_row)
                .filter(|(point, _)| !row_block_types.contains_key(&point.row()))
                .fold(HashMap::default(), |mut acc, (point, diagnostic)| {
                    acc.entry(point.row())
                        .or_insert_with(Vec::new)
                        .push(diagnostic);
                    acc
                })
        });

        if diagnostics_by_rows.is_empty() {
            return HashMap::default();
        }

        let severity_to_color = |sev: &lsp::DiagnosticSeverity| match sev {
            &lsp::DiagnosticSeverity::ERROR => Color::Error,
            &lsp::DiagnosticSeverity::WARNING => Color::Warning,
            &lsp::DiagnosticSeverity::INFORMATION => Color::Info,
            &lsp::DiagnosticSeverity::HINT => Color::Hint,
            _ => Color::Error,
        };

        let padding = ProjectSettings::get_global(cx).diagnostics.inline.padding as f32 * em_width;
        let min_x = column_pixels(
            &self.style,
            ProjectSettings::get_global(cx)
                .diagnostics
                .inline
                .min_column as usize,
            window,
        );

        let mut elements = HashMap::default();
        for (row, mut diagnostics) in diagnostics_by_rows {
            diagnostics.sort_by_key(|diagnostic| {
                (
                    diagnostic.severity,
                    std::cmp::Reverse(diagnostic.is_primary),
                    diagnostic.start.row,
                    diagnostic.start.column,
                )
            });

            let Some(diagnostic_to_render) = diagnostics
                .iter()
                .find(|diagnostic| diagnostic.is_primary)
                .or_else(|| diagnostics.first())
            else {
                continue;
            };

            let pos_y = content_origin.y + line_height * (row.0 as f64 - scroll_position.y) as f32;

            let window_ix = row.0.saturating_sub(start_row.0) as usize;
            let pos_x = {
                let crease_trailer_layout = &crease_trailers[window_ix];
                let line_layout = &line_layouts[window_ix];

                let line_end = if let Some(crease_trailer) = crease_trailer_layout {
                    crease_trailer.bounds.right()
                } else {
                    Pixels::from(
                        ScrollPixelOffset::from(content_origin.x + line_layout.width)
                            - scroll_pixel_position.x,
                    )
                };

                let padded_line = line_end + padding;
                let min_start = Pixels::from(
                    ScrollPixelOffset::from(content_origin.x + min_x) - scroll_pixel_position.x,
                );

                cmp::max(padded_line, min_start)
            };

            let behind_edit_prediction_popover = edit_prediction_popover_origin
                .as_ref()
                .is_some_and(|edit_prediction_popover_origin| {
                    (pos_y..pos_y + line_height).contains(&edit_prediction_popover_origin.y)
                });
            let opacity = if behind_edit_prediction_popover {
                0.5
            } else {
                1.0
            };

            let mut element = h_flex()
                .id(("diagnostic", row.0))
                .h(line_height)
                .w_full()
                .px_1()
                .rounded_xs()
                .opacity(opacity)
                .bg(severity_to_color(&diagnostic_to_render.severity)
                    .color(cx)
                    .opacity(0.05))
                .text_color(severity_to_color(&diagnostic_to_render.severity).color(cx))
                .text_sm()
                .font(style.text.font())
                .child(diagnostic_to_render.message.clone())
                .into_any();

            element.prepaint_as_root(point(pos_x, pos_y), AvailableSpace::min_size(), window, cx);

            elements.insert(row, element);
        }

        elements
    }

    fn layout_inline_code_actions(
        &self,
        display_point: DisplayPoint,
        content_origin: gpui::Point<Pixels>,
        scroll_position: gpui::Point<ScrollOffset>,
        scroll_pixel_position: gpui::Point<ScrollPixelOffset>,
        line_height: Pixels,
        snapshot: &EditorSnapshot,
        window: &mut Window,
        cx: &mut App,
    ) -> Option<AnyElement> {
        // Don't show code actions in split diff view
        if self.split_side.is_some() {
            return None;
        }

        if !snapshot
            .show_code_actions
            .unwrap_or(EditorSettings::get_global(cx).inline_code_actions)
        {
            return None;
        }

        let icon_size = ui::IconSize::XSmall;
        let mut button = self.editor.update(cx, |editor, cx| {
            if !editor.has_available_code_actions_for_selection() {
                return None;
            }
            let active = editor
                .context_menu
                .borrow()
                .as_ref()
                .and_then(|menu| {
                    if let crate::CodeContextMenu::CodeActions(CodeActionsMenu {
                        deployed_from,
                        ..
                    }) = menu
                    {
                        deployed_from.as_ref()
                    } else {
                        None
                    }
                })
                .is_some_and(|source| matches!(source, CodeActionSource::Indicator(..)));
            Some(editor.render_inline_code_actions(icon_size, display_point.row(), active, cx))
        })?;

        let buffer_point = display_point.to_point(&snapshot.display_snapshot);

        // do not show code action for folded line
        if snapshot.is_line_folded(MultiBufferRow(buffer_point.row)) {
            return None;
        }

        // do not show code action for blank line with cursor
        let line_indent = snapshot
            .display_snapshot
            .buffer_snapshot()
            .line_indent_for_row(MultiBufferRow(buffer_point.row));
        if line_indent.is_line_blank() {
            return None;
        }

        const INLINE_SLOT_CHAR_LIMIT: u32 = 4;
        const MAX_ALTERNATE_DISTANCE: u32 = 8;

        let is_valid_row = |row_candidate: u32| -> bool {
            // move to other row if folded row
            if snapshot.is_line_folded(MultiBufferRow(row_candidate)) {
                return false;
            }
            if buffer_point.row == row_candidate {
                // move to other row if cursor is in slot
                if buffer_point.column < INLINE_SLOT_CHAR_LIMIT {
                    return false;
                }
            } else {
                let candidate_point = MultiBufferPoint {
                    row: row_candidate,
                    column: 0,
                };
                // move to other row if different excerpt
                let range = if candidate_point < buffer_point {
                    candidate_point..buffer_point
                } else {
                    buffer_point..candidate_point
                };
                if snapshot
                    .display_snapshot
                    .buffer_snapshot()
                    .excerpt_containing(range)
                    .is_none()
                {
                    return false;
                }
            }
            let line_indent = snapshot
                .display_snapshot
                .buffer_snapshot()
                .line_indent_for_row(MultiBufferRow(row_candidate));
            // use this row if it's blank
            if line_indent.is_line_blank() {
                true
            } else {
                // use this row if code starts after slot
                let indent_size = snapshot
                    .display_snapshot
                    .buffer_snapshot()
                    .indent_size_for_line(MultiBufferRow(row_candidate));
                indent_size.len >= INLINE_SLOT_CHAR_LIMIT
            }
        };

        let new_buffer_row = if is_valid_row(buffer_point.row) {
            Some(buffer_point.row)
        } else {
            let max_row = snapshot.display_snapshot.buffer_snapshot().max_point().row;
            (1..=MAX_ALTERNATE_DISTANCE).find_map(|offset| {
                let row_above = buffer_point.row.saturating_sub(offset);
                let row_below = buffer_point.row + offset;
                if row_above != buffer_point.row && is_valid_row(row_above) {
                    Some(row_above)
                } else if row_below <= max_row && is_valid_row(row_below) {
                    Some(row_below)
                } else {
                    None
                }
            })
        }?;

        let new_display_row = snapshot
            .display_snapshot
            .point_to_display_point(
                Point {
                    row: new_buffer_row,
                    column: buffer_point.column,
                },
                text::Bias::Left,
            )
            .row();

        let start_y = content_origin.y
            + (((new_display_row.as_f64() - scroll_position.y) as f32) * line_height)
            + (line_height / 2.0)
            - (icon_size.square(window, cx) / 2.);
        let start_x = (ScrollPixelOffset::from(content_origin.x) - scroll_pixel_position.x
            + ScrollPixelOffset::from(window.rem_size() * 0.1))
        .into();

        let absolute_offset = gpui::point(start_x, start_y);
        button.layout_as_root(gpui::AvailableSpace::min_size(), window, cx);
        button.prepaint_as_root(
            absolute_offset,
            gpui::AvailableSpace::min_size(),
            window,
            cx,
        );
        Some(button)
    }

    fn layout_inline_blame(
        &self,
        display_row: DisplayRow,
        row_info: &RowInfo,
        line_layout: &LineWithInvisibles,
        crease_trailer: Option<&CreaseTrailerLayout>,
        em_width: Pixels,
        content_origin: gpui::Point<Pixels>,
        scroll_position: gpui::Point<ScrollOffset>,
        scroll_pixel_position: gpui::Point<ScrollPixelOffset>,
        line_height: Pixels,
        window: &mut Window,
        cx: &mut App,
    ) -> Option<InlineBlameLayout> {
        if !self
            .editor
            .update(cx, |editor, cx| editor.render_git_blame_inline(window, cx))
        {
            return None;
        }

        let editor = self.editor.read(cx);
        let blame = editor.blame.clone()?;
        let padding = {
            const INLINE_ACCEPT_SUGGESTION_EM_WIDTHS: f32 = 14.;

            let mut padding = ProjectSettings::get_global(cx).git.inline_blame.padding as f32;

            if let Some(edit_prediction) = editor.active_edit_prediction.as_ref()
                && let EditPrediction::Edit {
                    display_mode: EditDisplayMode::TabAccept,
                    ..
                } = &edit_prediction.completion
            {
                padding += INLINE_ACCEPT_SUGGESTION_EM_WIDTHS
            }

            padding * em_width
        };

        let (buffer_id, entry) = blame
            .update(cx, |blame, cx| {
                blame.blame_for_rows(&[*row_info], cx).next()
            })
            .flatten()?;

        let mut element = render_inline_blame_entry(entry.clone(), &self.style, cx)?;

        let start_y =
            content_origin.y + line_height * ((display_row.as_f64() - scroll_position.y) as f32);

        let start_x = {
            let line_end = if let Some(crease_trailer) = crease_trailer {
                crease_trailer.bounds.right()
            } else {
                Pixels::from(
                    ScrollPixelOffset::from(content_origin.x + line_layout.width)
                        - scroll_pixel_position.x,
                )
            };

            let padded_line_end = line_end + padding;

            let min_column_in_pixels = column_pixels(
                &self.style,
                ProjectSettings::get_global(cx).git.inline_blame.min_column as usize,
                window,
            );
            let min_start = Pixels::from(
                ScrollPixelOffset::from(content_origin.x + min_column_in_pixels)
                    - scroll_pixel_position.x,
            );

            cmp::max(padded_line_end, min_start)
        };

        let absolute_offset = point(start_x, start_y);
        let size = element.layout_as_root(AvailableSpace::min_size(), window, cx);
        let bounds = Bounds::new(absolute_offset, size);

        element.prepaint_as_root(absolute_offset, AvailableSpace::min_size(), window, cx);

        Some(InlineBlameLayout {
            element,
            bounds,
            buffer_id,
            entry,
        })
    }

    fn layout_blame_popover(
        &self,
        editor_snapshot: &EditorSnapshot,
        text_hitbox: &Hitbox,
        line_height: Pixels,
        window: &mut Window,
        cx: &mut App,
    ) {
        if !self.editor.read(cx).inline_blame_popover.is_some() {
            return;
        }

        let Some(blame) = self.editor.read(cx).blame.clone() else {
            return;
        };
        let cursor_point = self
            .editor
            .read(cx)
            .selections
            .newest::<language::Point>(&editor_snapshot.display_snapshot)
            .head();

        let Some((buffer, buffer_point)) = editor_snapshot
            .buffer_snapshot()
            .point_to_buffer_point(cursor_point)
        else {
            return;
        };

        let row_info = RowInfo {
            buffer_id: Some(buffer.remote_id()),
            buffer_row: Some(buffer_point.row),
            ..Default::default()
        };

        let Some((buffer_id, blame_entry)) = blame
            .update(cx, |blame, cx| blame.blame_for_rows(&[row_info], cx).next())
            .flatten()
        else {
            return;
        };

        let Some((popover_state, target_point)) = self.editor.read_with(cx, |editor, _| {
            editor
                .inline_blame_popover
                .as_ref()
                .map(|state| (state.popover_state.clone(), state.position))
        }) else {
            return;
        };

        let workspace = self
            .editor
            .read_with(cx, |editor, _| editor.workspace().map(|w| w.downgrade()));

        let maybe_element = workspace.and_then(|workspace| {
            render_blame_entry_popover(
                blame_entry,
                popover_state.scroll_handle,
                popover_state.commit_message,
                popover_state.markdown,
                workspace,
                &blame,
                buffer_id,
                window,
                cx,
            )
        });

        if let Some(mut element) = maybe_element {
            let size = element.layout_as_root(AvailableSpace::min_size(), window, cx);
            let overall_height = size.height + HOVER_POPOVER_GAP;
            let popover_origin = if target_point.y > overall_height {
                point(target_point.x, target_point.y - size.height)
            } else {
                point(
                    target_point.x,
                    target_point.y + line_height + HOVER_POPOVER_GAP,
                )
            };

            let horizontal_offset = (text_hitbox.top_right().x
                - POPOVER_RIGHT_OFFSET
                - (popover_origin.x + size.width))
                .min(Pixels::ZERO);

            let origin = point(popover_origin.x + horizontal_offset, popover_origin.y);
            let popover_bounds = Bounds::new(origin, size);

            self.editor.update(cx, |editor, _| {
                if let Some(state) = &mut editor.inline_blame_popover {
                    state.popover_bounds = Some(popover_bounds);
                }
            });

            window.defer_draw(element, origin, 2, None);
        }
    }

    fn layout_blame_entries(
        &self,
        buffer_rows: &[RowInfo],
        em_width: Pixels,
        scroll_position: gpui::Point<ScrollOffset>,
        start_row: DisplayRow,
        line_height: Pixels,
        gutter_hitbox: &Hitbox,
        max_width: Option<Pixels>,
        window: &mut Window,
        cx: &mut App,
    ) -> Option<Vec<AnyElement>> {
        if !self
            .editor
            .update(cx, |editor, cx| editor.render_git_blame_gutter(cx))
        {
            return None;
        }

        let blame = self.editor.read(cx).blame.clone()?;
        let workspace = self.editor.read(cx).workspace()?;
        let blamed_rows: Vec<_> = blame.update(cx, |blame, cx| {
            blame.blame_for_rows(buffer_rows, cx).collect()
        });

        let width = if let Some(max_width) = max_width {
            AvailableSpace::Definite(max_width)
        } else {
            AvailableSpace::MaxContent
        };
        let start_x = em_width;

        let mut last_used_color: Option<(Hsla, Oid)> = None;
        let blame_renderer = cx.global::<GlobalBlameRenderer>().0.clone();

        let shaped_lines = blamed_rows
            .into_iter()
            .enumerate()
            .flat_map(|(ix, blame_entry)| {
                let (buffer_id, blame_entry) = blame_entry?;
                let mut element = render_blame_entry(
                    ix,
                    &blame,
                    blame_entry,
                    &self.style,
                    &mut last_used_color,
                    self.editor.clone(),
                    workspace.clone(),
                    buffer_id,
                    &*blame_renderer,
                    window,
                    cx,
                )?;

                let start_y = line_height
                    * (DisplayRow(start_row.0 + ix as u32).as_f64() - scroll_position.y) as f32;
                let absolute_offset = gutter_hitbox.origin + point(start_x, start_y);

                element.prepaint_as_root(
                    absolute_offset,
                    size(width, AvailableSpace::MinContent),
                    window,
                    cx,
                );

                Some(element)
            })
            .collect();

        Some(shaped_lines)
    }

    fn layout_indent_guides(
        &self,
        content_origin: gpui::Point<Pixels>,
        text_origin: gpui::Point<Pixels>,
        visible_buffer_range: Range<MultiBufferRow>,
        scroll_pixel_position: gpui::Point<ScrollPixelOffset>,
        line_height: Pixels,
        snapshot: &DisplaySnapshot,
        window: &mut Window,
        cx: &mut App,
    ) -> Option<Vec<IndentGuideLayout>> {
        let indent_guides = self.editor.update(cx, |editor, cx| {
            editor.indent_guides(visible_buffer_range, snapshot, cx)
        })?;

        let active_indent_guide_indices = self.editor.update(cx, |editor, cx| {
            editor
                .find_active_indent_guide_indices(&indent_guides, snapshot, window, cx)
                .unwrap_or_default()
        });

        Some(
            indent_guides
                .into_iter()
                .enumerate()
                .filter_map(|(i, indent_guide)| {
                    let single_indent_width =
                        column_pixels(&self.style, indent_guide.tab_size as usize, window);
                    let total_width = single_indent_width * indent_guide.depth as f32;
                    let start_x = Pixels::from(
                        ScrollOffset::from(content_origin.x + total_width)
                            - scroll_pixel_position.x,
                    );
                    if start_x >= text_origin.x {
                        let (offset_y, length, display_row_range) =
                            Self::calculate_indent_guide_bounds(
                                indent_guide.start_row..indent_guide.end_row,
                                line_height,
                                snapshot,
                            );

                        let start_y = Pixels::from(
                            ScrollOffset::from(content_origin.y) + offset_y
                                - scroll_pixel_position.y,
                        );

                        Some(IndentGuideLayout {
                            origin: point(start_x, start_y),
                            length,
                            single_indent_width,
                            display_row_range,
                            depth: indent_guide.depth,
                            active: active_indent_guide_indices.contains(&i),
                            settings: indent_guide.settings,
                        })
                    } else {
                        None
                    }
                })
                .collect(),
        )
    }

    fn depth_zero_indent_guide_padding_for_row(
        indent_guides: &[IndentGuideLayout],
        row: DisplayRow,
    ) -> Pixels {
        indent_guides
            .iter()
            .find(|guide| guide.depth == 0 && guide.display_row_range.contains(&row))
            .and_then(|guide| {
                guide
                    .settings
                    .visible_line_width(guide.active)
                    .map(|width| px(width as f32 * 2.0))
            })
            .unwrap_or(px(0.0))
    }

    fn layout_wrap_guides(
        &self,
        em_advance: Pixels,
        scroll_position: gpui::Point<f64>,
        content_origin: gpui::Point<Pixels>,
        scrollbar_layout: Option<&EditorScrollbars>,
        vertical_scrollbar_width: Pixels,
        hitbox: &Hitbox,
        window: &Window,
        cx: &App,
    ) -> SmallVec<[(Pixels, bool); 2]> {
        let scroll_left = scroll_position.x as f32 * em_advance;
        let content_origin = content_origin.x;
        let horizontal_offset = content_origin - scroll_left;
        let vertical_scrollbar_width = scrollbar_layout
            .and_then(|layout| layout.visible.then_some(vertical_scrollbar_width))
            .unwrap_or_default();

        self.editor
            .read(cx)
            .wrap_guides(cx)
            .into_iter()
            .flat_map(|(guide, active)| {
                let wrap_position = column_pixels(&self.style, guide, window);
                let wrap_guide_x = wrap_position + horizontal_offset;
                let display_wrap_guide = wrap_guide_x >= content_origin
                    && wrap_guide_x <= hitbox.bounds.right() - vertical_scrollbar_width;

                display_wrap_guide.then_some((wrap_guide_x, active))
            })
            .collect()
    }

    fn calculate_indent_guide_bounds(
        row_range: Range<MultiBufferRow>,
        line_height: Pixels,
        snapshot: &DisplaySnapshot,
    ) -> (f64, gpui::Pixels, Range<DisplayRow>) {
        let start_point = Point::new(row_range.start.0, 0);
        let end_point = Point::new(row_range.end.0, 0);

        let mut row_range = start_point.to_display_point(snapshot).row()
            ..end_point.to_display_point(snapshot).row();

        let mut prev_line = start_point;
        prev_line.row = prev_line.row.saturating_sub(1);
        let prev_line = prev_line.to_display_point(snapshot).row();

        let mut cons_line = end_point;
        cons_line.row += 1;
        let cons_line = cons_line.to_display_point(snapshot).row();

        let mut offset_y = row_range.start.as_f64() * f64::from(line_height);
        let mut length = (cons_line.0.saturating_sub(row_range.start.0)) as f32 * line_height;

        // If we are at the end of the buffer, ensure that the indent guide extends to the end of the line.
        if row_range.end == cons_line {
            length += line_height;
        }

        // If there is a block (e.g. diagnostic) in between the start of the indent guide and the line above,
        // we want to extend the indent guide to the start of the block.
        let mut block_height = 0;
        let mut block_offset = 0;
        let mut found_excerpt_header = false;
        for (_, block) in snapshot.blocks_in_range(prev_line..row_range.start) {
            if matches!(
                block,
                Block::ExcerptBoundary { .. } | Block::BufferHeader { .. }
            ) {
                found_excerpt_header = true;
                break;
            }
            block_offset += block.height();
            block_height += block.height();
        }
        if !found_excerpt_header {
            offset_y -= block_offset as f64 * f64::from(line_height);
            length += block_height as f32 * line_height;
            row_range = DisplayRow(row_range.start.0.saturating_sub(block_offset))..row_range.end;
        }

        // If there is a block (e.g. diagnostic) at the end of an multibuffer excerpt,
        // we want to ensure that the indent guide stops before the excerpt header.
        let mut block_height = 0;
        let mut found_excerpt_header = false;
        for (_, block) in snapshot.blocks_in_range(row_range.end..cons_line) {
            if matches!(
                block,
                Block::ExcerptBoundary { .. } | Block::BufferHeader { .. }
            ) {
                found_excerpt_header = true;
            }
            block_height += block.height();
        }
        if found_excerpt_header {
            length -= block_height as f32 * line_height;
        } else {
            row_range = row_range.start..cons_line;
        }

        (offset_y, length, row_range)
    }

    fn layout_bookmarks(
        &self,
        gutter: &Gutter<'_>,
        bookmarks: &HashSet<DisplayRow>,
        window: &mut Window,
        cx: &mut App,
    ) -> Vec<AnyElement> {
        if self.split_side == Some(SplitSide::Left) {
            return Vec::new();
        }

        self.editor.update(cx, |editor, cx| {
            bookmarks
                .iter()
                .filter_map(|row| {
                    gutter.layout_item_skipping_folds(
                        *row,
                        |cx, _| editor.render_bookmark(*row, cx).into_any_element(),
                        window,
                        cx,
                    )
                })
                .collect_vec()
        })
    }

    fn layout_gutter_hover_button(
        &self,
        gutter: &Gutter,
        position: Anchor,
        row: DisplayRow,
        window: &mut Window,
        cx: &mut App,
    ) -> Option<AnyElement> {
        if self.split_side == Some(SplitSide::Left) {
            return None;
        }

        self.editor.update(cx, |editor, cx| {
            gutter.layout_item_skipping_folds(
                row,
                |cx, window| {
                    editor
                        .render_gutter_hover_button(position, row, window, cx)
                        .into_any_element()
                },
                window,
                cx,
            )
        })
    }

    fn layout_breakpoints(
        &self,
        gutter: &Gutter,
        breakpoints: &HashMap<DisplayRow, (Anchor, Breakpoint, Option<BreakpointSessionState>)>,
        window: &mut Window,
        cx: &mut App,
    ) -> Vec<AnyElement> {
        if self.split_side == Some(SplitSide::Left) {
            return Vec::new();
        }

        self.editor.update(cx, |editor, cx| {
            breakpoints
                .iter()
                .filter_map(|(row, (text_anchor, bp, state))| {
                    gutter.layout_item_skipping_folds(
                        *row,
                        |cx, _| {
                            editor
                                .render_breakpoint(*text_anchor, *row, &bp, *state, cx)
                                .into_any_element()
                        },
                        window,
                        cx,
                    )
                })
                .collect_vec()
        })
    }

    fn should_render_diff_review_button(
        &self,
        range: Range<DisplayRow>,
        row_infos: &[RowInfo],
        snapshot: &EditorSnapshot,
        cx: &App,
    ) -> Option<(DisplayRow, Option<u32>)> {
        if !cx.has_flag::<DiffReviewFeatureFlag>() {
            return None;
        }

        let show_diff_review_button = self.editor.read(cx).show_diff_review_button();
        if !show_diff_review_button {
            return None;
        }

        let indicator = self.editor.read(cx).gutter_diff_review_indicator.0?;
        if !indicator.is_active {
            return None;
        }

        let display_row = indicator
            .start
            .to_display_point(&snapshot.display_snapshot)
            .row();
        let row_index = (display_row.0.saturating_sub(range.start.0)) as usize;

        let row_info = row_infos.get(row_index);
        if row_info.is_some_and(|row_info| row_info.expand_info.is_some()) {
            return None;
        }

        let buffer_id = row_info.and_then(|info| info.buffer_id);
        if buffer_id.is_none() {
            return None;
        }

        let editor = self.editor.read(cx);
        if buffer_id.is_some_and(|buffer_id| editor.is_buffer_folded(buffer_id, cx)) {
            return None;
        }

        let buffer_row = row_info.and_then(|info| info.buffer_row);
        Some((display_row, buffer_row))
    }

    fn layout_run_indicators(
        &self,
        gutter: &Gutter,
        run_indicators: &HashSet<DisplayRow>,
        breakpoints: &HashMap<DisplayRow, (Anchor, Breakpoint, Option<BreakpointSessionState>)>,
        window: &mut Window,
        cx: &mut App,
    ) -> Vec<AnyElement> {
        if self.split_side == Some(SplitSide::Left) {
            return Vec::new();
        }

        self.editor.update(cx, |editor, cx| {
            let active_task_indicator_row =
                // TODO: add edit button on the right side of each row in the context menu
                if let Some(crate::CodeContextMenu::CodeActions(CodeActionsMenu {
                    deployed_from,
                    actions,
                    ..
                })) = editor.context_menu.borrow().as_ref()
                {
                    actions
                        .tasks()
                        .map(|tasks| tasks.position.to_display_point(gutter.snapshot).row())
                        .or_else(|| match deployed_from {
                            Some(CodeActionSource::Indicator(row)) => Some(*row),
                            _ => None,
                        })
                } else {
                    None
                };

            run_indicators
                .iter()
                .filter_map(|display_row| {
                    gutter.layout_item(
                        *display_row,
                        |cx, _| {
                            editor
                                .render_run_indicator(
                                    &self.style,
                                    Some(*display_row) == active_task_indicator_row,
                                    breakpoints.get(&display_row).map(|(anchor, _, _)| *anchor),
                                    *display_row,
                                    cx,
                                )
                                .into_any_element()
                        },
                        window,
                        cx,
                    )
                })
                .collect_vec()
        })
    }

    fn layout_expand_toggles(
        &self,
        gutter_hitbox: &Hitbox,
        gutter_dimensions: GutterDimensions,
        em_width: Pixels,
        line_height: Pixels,
        scroll_position: gpui::Point<ScrollOffset>,
        start_row: DisplayRow,
        buffer_rows: &[RowInfo],
        window: &mut Window,
        cx: &mut App,
    ) -> Vec<Option<(AnyElement, gpui::Point<Pixels>)>> {
        if self.editor.read(cx).disable_expand_excerpt_buttons {
            return vec![];
        }

        let editor_font_size = self.style.text.font_size.to_pixels(window.rem_size()) * 1.2;

        let max_line_number_length = self
            .editor
            .read(cx)
            .buffer()
            .read(cx)
            .snapshot(cx)
            .widest_line_number()
            .ilog10()
            + 1;

        let git_gutter_width = Self::gutter_strip_width(line_height)
            + gutter_dimensions
                .git_blame_entries_width
                .unwrap_or_default();
        let available_width = gutter_dimensions.left_padding - git_gutter_width;

        buffer_rows
            .iter()
            .enumerate()
            .map(|(ix, row_info)| {
                let ExpandInfo {
                    direction,
                    start_anchor,
                } = row_info.expand_info?;

                let icon_name = match direction {
                    ExpandExcerptDirection::Up => IconName::ExpandUp,
                    ExpandExcerptDirection::Down => IconName::ExpandDown,
                    ExpandExcerptDirection::UpAndDown => IconName::ExpandVertical,
                };

                let editor = self.editor.clone();
                let is_wide = max_line_number_length
                    >= EditorSettings::get_global(cx).gutter.min_line_number_digits as u32
                    && row_info
                        .buffer_row
                        .is_some_and(|row| (row + 1).ilog10() + 1 == max_line_number_length)
                    || gutter_dimensions.right_padding == px(0.);

                let width = if is_wide {
                    available_width - px(5.)
                } else {
                    available_width + em_width - px(5.)
                };

                let toggle = IconButton::new(("expand", ix), icon_name)
                    .icon_color(Color::Custom(cx.theme().colors().editor_line_number))
                    .icon_size(IconSize::Custom(rems(editor_font_size / window.rem_size())))
                    .width(width)
                    .on_click(move |_, window, cx| {
                        editor.update(cx, |editor, cx| {
                            editor.expand_excerpt(start_anchor, direction, window, cx);
                        });
                    })
                    .tooltip(Tooltip::for_action_title(
                        "Expand Excerpt",
                        &crate::actions::ExpandExcerpts::default(),
                    ))
                    .into_any_element();

                let position = point(
                    git_gutter_width + px(1.),
                    line_height
                        * (DisplayRow(start_row.0 + ix as u32).as_f64() - scroll_position.y) as f32
                        + px(1.),
                );
                let origin = gutter_hitbox.origin + position;

                Some((toggle, origin))
            })
            .collect()
    }

    fn layout_line_numbers(
        &self,
        gutter: &Gutter<'_>,
        active_rows: &BTreeMap<DisplayRow, LineHighlightSpec>,
        current_selection_head: Option<DisplayRow>,
        window: &mut Window,
        cx: &mut App,
    ) -> Arc<HashMap<MultiBufferRow, LineNumberLayout>> {
        let include_line_numbers = gutter
            .snapshot
            .show_line_numbers
            .unwrap_or_else(|| EditorSettings::get_global(cx).gutter.line_numbers);
        if !include_line_numbers {
            return Arc::default();
        }

        let relative = self.editor.read(cx).relative_line_numbers(cx);

        let relative_line_numbers_enabled = relative.enabled();
        let relative_rows = if relative_line_numbers_enabled
            && let Some(current_selection_head) = current_selection_head
        {
            gutter.snapshot.calculate_relative_line_numbers(
                &gutter.range,
                current_selection_head,
                relative.wrapped(),
            )
        } else {
            Default::default()
        };

        let mut line_number = String::new();
        let segments = gutter
            .row_infos
            .iter()
            .enumerate()
            .flat_map(|(ix, row_info)| {
                let display_row = DisplayRow(gutter.range.start.0 + ix as u32);
                line_number.clear();
                let non_relative_number = if relative.wrapped() {
                    row_info.buffer_row.or(row_info.wrapped_buffer_row)? + 1
                } else {
                    row_info.buffer_row? + 1
                };
                let relative_number = relative_rows.get(&display_row);
                if !(relative_line_numbers_enabled && relative_number.is_some())
                    && !gutter.snapshot.number_deleted_lines
                    && row_info
                        .diff_status
                        .is_some_and(|status| status.is_deleted())
                {
                    return None;
                }

                let number = relative_number.unwrap_or(&non_relative_number);
                write!(&mut line_number, "{number}").unwrap();

                let color = active_rows
                    .get(&display_row)
                    .map(|spec| {
                        if spec.breakpoint {
                            cx.theme().colors().debugger_accent
                        } else {
                            cx.theme().colors().editor_active_line_number
                        }
                    })
                    .unwrap_or_else(|| cx.theme().colors().editor_line_number);
                let shaped_line =
                    self.shape_line_number(SharedString::from(&line_number), color, window);
                let scroll_top =
                    gutter.scroll_position.y * ScrollPixelOffset::from(gutter.line_height);
                let line_origin = gutter.hitbox.origin
                    + point(
                        gutter.hitbox.size.width
                            - shaped_line.width
                            - gutter.dimensions.right_padding,
                        ix as f32 * gutter.line_height
                            - Pixels::from(
                                scroll_top % ScrollPixelOffset::from(gutter.line_height),
                            ),
                    );

                #[cfg(not(test))]
                let hitbox = Some(window.insert_hitbox(
                    Bounds::new(line_origin, size(shaped_line.width, gutter.line_height)),
                    HitboxBehavior::Normal,
                ));
                #[cfg(test)]
                let hitbox = {
                    let _ = line_origin;
                    None
                };

                let segment = LineNumberSegment {
                    shaped_line,
                    hitbox,
                };

                let buffer_row = DisplayPoint::new(display_row, 0)
                    .to_point(gutter.snapshot)
                    .row;
                let multi_buffer_row = MultiBufferRow(buffer_row);

                Some((multi_buffer_row, segment))
            });

        let mut line_numbers: HashMap<MultiBufferRow, LineNumberLayout> = HashMap::default();
        for (buffer_row, segment) in segments {
            line_numbers
                .entry(buffer_row)
                .or_insert_with(|| LineNumberLayout {
                    segments: Default::default(),
                })
                .segments
                .push(segment);
        }
        Arc::new(line_numbers)
    }

    fn layout_crease_toggles(
        &self,
        rows: Range<DisplayRow>,
        row_infos: &[RowInfo],
        active_rows: &BTreeMap<DisplayRow, LineHighlightSpec>,
        snapshot: &EditorSnapshot,
        window: &mut Window,
        cx: &mut App,
    ) -> Vec<Option<AnyElement>> {
        let include_fold_statuses = EditorSettings::get_global(cx).gutter.folds
            && snapshot.mode.is_full()
            && self.editor.read(cx).buffer_kind(cx) == ItemBufferKind::Singleton;
        if include_fold_statuses {
            row_infos
                .iter()
                .enumerate()
                .map(|(ix, info)| {
                    if info.expand_info.is_some() {
                        return None;
                    }
                    let row = info.multibuffer_row?;
                    let display_row = DisplayRow(rows.start.0 + ix as u32);
                    let active = active_rows.contains_key(&display_row);

                    snapshot.render_crease_toggle(row, active, self.editor.clone(), window, cx)
                })
                .collect()
        } else {
            Vec::new()
        }
    }

    fn layout_crease_trailers(
        &self,
        buffer_rows: impl IntoIterator<Item = RowInfo>,
        snapshot: &EditorSnapshot,
        window: &mut Window,
        cx: &mut App,
    ) -> Vec<Option<AnyElement>> {
        buffer_rows
            .into_iter()
            .map(|row_info| {
                if row_info.expand_info.is_some() {
                    return None;
                }
                if let Some(row) = row_info.multibuffer_row {
                    snapshot.render_crease_trailer(row, window, cx)
                } else {
                    None
                }
            })
            .collect()
    }

    fn bg_segments_per_row(
        rows: Range<DisplayRow>,
        selections: &[(PlayerColor, Vec<SelectionLayout>)],
        highlight_ranges: impl IntoIterator<Item = (Range<DisplayPoint>, Hsla)>,
        base_background: Hsla,
    ) -> Vec<Vec<(Range<DisplayPoint>, Hsla)>> {
        if rows.start >= rows.end {
            return Vec::new();
        }
        if !base_background.is_opaque() {
            // We don't actually know what color is behind this editor.
            return Vec::new();
        }
        let highlight_iter = highlight_ranges.into_iter();
        let selection_iter = selections.iter().flat_map(|(player_color, layouts)| {
            let color = player_color.selection;
            layouts.iter().filter_map(move |selection_layout| {
                if selection_layout.range.start != selection_layout.range.end {
                    Some((selection_layout.range.clone(), color))
                } else {
                    None
                }
            })
        });
        let mut per_row_map = vec![Vec::new(); rows.len()];
        for (range, color) in highlight_iter.chain(selection_iter) {
            let covered_rows = if range.end.column() == 0 {
                cmp::max(range.start.row(), rows.start)..cmp::min(range.end.row(), rows.end)
            } else {
                cmp::max(range.start.row(), rows.start)
                    ..cmp::min(range.end.row().next_row(), rows.end)
            };
            for row in covered_rows.iter_rows() {
                let seg_start = if row == range.start.row() {
                    range.start
                } else {
                    DisplayPoint::new(row, 0)
                };
                let seg_end = if row == range.end.row() && range.end.column() != 0 {
                    range.end
                } else {
                    DisplayPoint::new(row, u32::MAX)
                };
                let ix = row.minus(rows.start) as usize;
                debug_assert!(row >= rows.start && row < rows.end);
                debug_assert!(ix < per_row_map.len());
                per_row_map[ix].push((seg_start..seg_end, color));
            }
        }
        for row_segments in per_row_map.iter_mut() {
            if row_segments.is_empty() {
                continue;
            }
            let segments = mem::take(row_segments);
            let merged = Self::merge_overlapping_ranges(segments, base_background);
            *row_segments = merged;
        }
        per_row_map
    }

    /// Merge overlapping ranges by splitting at all range boundaries and blending colors where
    /// multiple ranges overlap. The result contains non-overlapping ranges ordered from left to right.
    ///
    /// Expects `start.row() == end.row()` for each range.
    fn merge_overlapping_ranges(
        ranges: Vec<(Range<DisplayPoint>, Hsla)>,
        base_background: Hsla,
    ) -> Vec<(Range<DisplayPoint>, Hsla)> {
        struct Boundary {
            pos: DisplayPoint,
            is_start: bool,
            index: usize,
            color: Hsla,
        }

        let mut boundaries: SmallVec<[Boundary; 16]> = SmallVec::with_capacity(ranges.len() * 2);
        for (index, (range, color)) in ranges.iter().enumerate() {
            debug_assert!(
                range.start.row() == range.end.row(),
                "expects single-row ranges"
            );
            if range.start < range.end {
                boundaries.push(Boundary {
                    pos: range.start,
                    is_start: true,
                    index,
                    color: *color,
                });
                boundaries.push(Boundary {
                    pos: range.end,
                    is_start: false,
                    index,
                    color: *color,
                });
            }
        }

        if boundaries.is_empty() {
            return Vec::new();
        }

        boundaries
            .sort_unstable_by(|a, b| a.pos.cmp(&b.pos).then_with(|| a.is_start.cmp(&b.is_start)));

        let mut processed_ranges: Vec<(Range<DisplayPoint>, Hsla)> = Vec::new();
        let mut active_ranges: SmallVec<[(usize, Hsla); 8]> = SmallVec::new();

        let mut i = 0;
        let mut start_pos = boundaries[0].pos;

        let boundaries_len = boundaries.len();
        while i < boundaries_len {
            let current_boundary_pos = boundaries[i].pos;
            if start_pos < current_boundary_pos {
                if !active_ranges.is_empty() {
                    let mut color = base_background;
                    for &(_, c) in &active_ranges {
                        color = Hsla::blend(color, c);
                    }
                    if let Some((last_range, last_color)) = processed_ranges.last_mut() {
                        if *last_color == color && last_range.end == start_pos {
                            last_range.end = current_boundary_pos;
                        } else {
                            processed_ranges.push((start_pos..current_boundary_pos, color));
                        }
                    } else {
                        processed_ranges.push((start_pos..current_boundary_pos, color));
                    }
                }
            }
            while i < boundaries_len && boundaries[i].pos == current_boundary_pos {
                let active_range = &boundaries[i];
                if active_range.is_start {
                    let idx = active_range.index;
                    let pos = active_ranges
                        .binary_search_by_key(&idx, |(i, _)| *i)
                        .unwrap_or_else(|p| p);
                    active_ranges.insert(pos, (idx, active_range.color));
                } else {
                    let idx = active_range.index;
                    if let Ok(pos) = active_ranges.binary_search_by_key(&idx, |(i, _)| *i) {
                        active_ranges.remove(pos);
                    }
                }
                i += 1;
            }
            start_pos = current_boundary_pos;
        }

        processed_ranges
    }

    fn layout_lines(
        rows: Range<DisplayRow>,
        snapshot: &EditorSnapshot,
        style: &EditorStyle,
        editor_width: Pixels,
        is_row_soft_wrapped: impl Copy + Fn(usize) -> bool,
        bg_segments_per_row: &[Vec<(Range<DisplayPoint>, Hsla)>],
        window: &mut Window,
        cx: &mut App,
    ) -> Vec<LineWithInvisibles> {
        if rows.start >= rows.end {
            return Vec::new();
        }

        // Show the placeholder when the editor is empty
        if snapshot.is_empty() {
            let font_size = style.text.font_size.to_pixels(window.rem_size());
            let placeholder_color = cx.theme().colors().text_placeholder;
            let placeholder_text = snapshot.placeholder_text();

            let placeholder_lines = placeholder_text
                .as_ref()
                .map_or(Vec::new(), |text| text.split('\n').collect::<Vec<_>>());

            let placeholder_line_count = placeholder_lines.len();

            placeholder_lines
                .into_iter()
                .skip(rows.start.0 as usize)
                .chain(iter::repeat(""))
                .take(cmp::max(rows.len(), placeholder_line_count))
                .map(move |line| {
                    let run = TextRun {
                        len: line.len(),
                        font: style.text.font(),
                        color: placeholder_color,
                        ..Default::default()
                    };
                    let line = window.text_system().shape_line(
                        line.to_string().into(),
                        font_size,
                        &[run],
                        None,
                    );
                    LineWithInvisibles {
                        width: line.width,
                        len: line.len,
                        fragments: smallvec![LineFragment::Text(line)],
                        invisibles: Vec::new(),
                        font_size,
                    }
                })
                .collect()
        } else {
            let use_tree_sitter = !snapshot.semantic_tokens_enabled
                || snapshot.use_tree_sitter_for_syntax(rows.start, cx);
            let language_aware = LanguageAwareStyling {
                tree_sitter: use_tree_sitter,
                diagnostics: true,
            };
            let chunks = snapshot.highlighted_chunks(rows.clone(), language_aware, style);
            LineWithInvisibles::from_chunks(
                chunks,
                style,
                MAX_LINE_LEN,
                rows.len(),
                &snapshot.mode,
                editor_width,
                is_row_soft_wrapped,
                bg_segments_per_row,
                window,
                cx,
            )
        }
    }

    fn prepaint_lines(
        &self,
        start_row: DisplayRow,
        line_layouts: &mut [LineWithInvisibles],
        line_height: Pixels,
        scroll_position: gpui::Point<ScrollOffset>,
        scroll_pixel_position: gpui::Point<ScrollPixelOffset>,
        content_origin: gpui::Point<Pixels>,
        window: &mut Window,
        cx: &mut App,
    ) -> SmallVec<[AnyElement; 1]> {
        let mut line_elements = SmallVec::new();
        for (ix, line) in line_layouts.iter_mut().enumerate() {
            let row = start_row + DisplayRow(ix as u32);
            line.prepaint(
                line_height,
                scroll_position,
                scroll_pixel_position,
                row,
                content_origin,
                &mut line_elements,
                window,
                cx,
            );
        }
        line_elements
    }

    fn render_block(
        &self,
        block: &Block,
        available_width: AvailableSpace,
        block_id: BlockId,
        block_row_start: DisplayRow,
        snapshot: &EditorSnapshot,
        text_x: Pixels,
        rows: &Range<DisplayRow>,
        line_layouts: &[LineWithInvisibles],
        editor_margins: &EditorMargins,
        line_height: Pixels,
        em_width: Pixels,
        text_hitbox: &Hitbox,
        editor_width: Pixels,
        scroll_width: &mut Pixels,
        resized_blocks: &mut HashMap<CustomBlockId, u32>,
        row_block_types: &mut HashMap<DisplayRow, bool>,
        selections: &[Selection<Point>],
        selected_buffer_ids: &Vec<BufferId>,
        latest_selection_anchors: &HashMap<BufferId, Anchor>,
        is_row_soft_wrapped: impl Copy + Fn(usize) -> bool,
        sticky_header_excerpt_id: Option<BufferId>,
        indent_guides: &Option<Vec<IndentGuideLayout>>,
        block_resize_offset: &mut i32,
        window: &mut Window,
        cx: &mut App,
    ) -> Option<(AnyElement, Size<Pixels>, DisplayRow, Pixels)> {
        let mut x_position = None;
        let mut element = match block {
            Block::Custom(custom) => {
                let block_start = custom.start().to_point(&snapshot.buffer_snapshot());
                let block_end = custom.end().to_point(&snapshot.buffer_snapshot());
                if block.place_near() && snapshot.is_line_folded(MultiBufferRow(block_start.row)) {
                    return None;
                }
                let align_to = block_start.to_display_point(snapshot);
                let x_and_width = |layout: &LineWithInvisibles| {
                    Some((
                        text_x + layout.x_for_index(align_to.column() as usize),
                        text_x + layout.width,
                    ))
                };
                let line_ix = align_to.row().0.checked_sub(rows.start.0);
                x_position =
                    if let Some(layout) = line_ix.and_then(|ix| line_layouts.get(ix as usize)) {
                        x_and_width(layout)
                    } else {
                        x_and_width(&layout_line(
                            align_to.row(),
                            snapshot,
                            &self.style,
                            editor_width,
                            is_row_soft_wrapped,
                            window,
                            cx,
                        ))
                    };

                let anchor_x = x_position.unwrap().0;

                let selected = selections
                    .binary_search_by(|selection| {
                        if selection.end <= block_start {
                            Ordering::Less
                        } else if selection.start >= block_end {
                            Ordering::Greater
                        } else {
                            Ordering::Equal
                        }
                    })
                    .is_ok();

                div()
                    .size_full()
                    .child(
                        custom.render(&mut BlockContext {
                            window,
                            app: cx,
                            anchor_x,
                            margins: editor_margins,
                            line_height,
                            em_width,
                            block_id,
                            height: custom.height.unwrap_or(1),
                            selected,
                            max_width: text_hitbox.size.width.max(*scroll_width),
                            editor_style: &self.style,
                            indent_guide_padding: indent_guides
                                .as_ref()
                                .map(|guides| {
                                    Self::depth_zero_indent_guide_padding_for_row(
                                        guides,
                                        block_row_start,
                                    )
                                })
                                .unwrap_or(px(0.0)),
                        }),
                    )
                    .into_any()
            }

            Block::FoldedBuffer {
                first_excerpt,
                height,
                ..
            } => {
                let mut result = v_flex().id(block_id).w_full().pr(editor_margins.right);

                if self.should_show_buffer_headers() {
                    let selected = selected_buffer_ids.contains(&first_excerpt.buffer_id());
                    let jump_data = header::header_jump_data(
                        snapshot,
                        block_row_start,
                        *height,
                        first_excerpt,
                        latest_selection_anchors,
                    );
                    result = result.child(header::render_buffer_header(
                        &self.editor,
                        first_excerpt,
                        true,
                        selected,
                        false,
                        jump_data,
                        window,
                        cx,
                    ));
                } else {
                    result =
                        result.child(div().h(FILE_HEADER_HEIGHT as f32 * window.line_height()));
                }

                result.into_any_element()
            }

            Block::ExcerptBoundary { .. } => {
                let color = cx.theme().colors().clone();
                let mut result = v_flex().id(block_id).w_full();

                result = result.child(
                    h_flex().relative().child(
                        div()
                            .top(line_height / 2.)
                            .absolute()
                            .w_full()
                            .h_px()
                            .bg(color.border_variant),
                    ),
                );

                result.into_any()
            }

            Block::BufferHeader { excerpt, height } => {
                let mut result = v_flex().id(block_id).w_full();

                if self.should_show_buffer_headers() {
                    let jump_data = header::header_jump_data(
                        snapshot,
                        block_row_start,
                        *height,
                        excerpt,
                        latest_selection_anchors,
                    );

                    if sticky_header_excerpt_id != Some(excerpt.buffer_id()) {
                        let selected = selected_buffer_ids.contains(&excerpt.buffer_id());

                        result = result.child(div().pr(editor_margins.right).child(
                            header::render_buffer_header(
                                &self.editor,
                                excerpt,
                                false,
                                selected,
                                false,
                                jump_data,
                                window,
                                cx,
                            ),
                        ));
                    } else {
                        result =
                            result.child(div().h(FILE_HEADER_HEIGHT as f32 * window.line_height()));
                    }
                } else {
                    result =
                        result.child(div().h(FILE_HEADER_HEIGHT as f32 * window.line_height()));
                }

                result.into_any()
            }

            Block::Spacer { height, .. } => {
                let indent_guide_padding = indent_guides
                    .as_ref()
                    .map(|guides| {
                        Self::depth_zero_indent_guide_padding_for_row(guides, block_row_start)
                    })
                    .unwrap_or(px(0.0));
                Self::render_spacer_block(
                    block_id,
                    *height,
                    line_height,
                    indent_guide_padding,
                    window,
                    cx,
                )
            }
        };

        // Discover the element's content height, then round up to the nearest multiple of line height.
        let preliminary_size = element.layout_as_root(
            size(available_width, AvailableSpace::MinContent),
            window,
            cx,
        );
        let quantized_height = (preliminary_size.height / line_height).ceil() * line_height;
        let final_size = if preliminary_size.height == quantized_height {
            preliminary_size
        } else {
            element.layout_as_root(size(available_width, quantized_height.into()), window, cx)
        };
        let mut element_height_in_lines = ((final_size.height / line_height).ceil() as u32).max(1);

        let effective_row_start = block_row_start.0 as i32 + *block_resize_offset;
        debug_assert!(effective_row_start >= 0);
        let mut row = DisplayRow(effective_row_start.max(0) as u32);

        let mut x_offset = px(0.);
        let mut is_block = true;

        if let BlockId::Custom(custom_block_id) = block_id
            && block.has_height()
        {
            if block.place_near()
                && let Some((x_target, line_width)) = x_position
            {
                let margin = em_width * 2;
                if line_width + final_size.width + margin
                    < editor_width + editor_margins.gutter.full_width()
                    && !row_block_types.contains_key(&(row - 1))
                    && element_height_in_lines == 1
                {
                    // Render inline at end of line (for diagnostic blocks that fit)
                    x_offset = line_width + margin;
                    row = row - 1;
                    is_block = false;
                    element_height_in_lines = 0;
                    row_block_types.insert(row, is_block);
                } else {
                    let max_offset =
                        editor_width + editor_margins.gutter.full_width() - final_size.width;
                    let min_offset = (x_target + em_width - final_size.width)
                        .max(editor_margins.gutter.full_width());
                    x_offset = x_target.min(max_offset).max(min_offset);
                }
            };
            if element_height_in_lines != block.height() {
                *block_resize_offset += element_height_in_lines as i32 - block.height() as i32;
                resized_blocks.insert(custom_block_id, element_height_in_lines);
            }
        }
        for i in 0..element_height_in_lines {
            row_block_types.insert(row + i, is_block);
        }

        Some((element, final_size, row, x_offset))
    }

    /// The spacer pattern period must be an even factor of the line height, so
    /// that two consecutive spacer blocks can render contiguously without an
    /// obvious break in the pattern.
    ///
    /// Two consecutive spacers can appear when the other side has a diff hunk
    /// and a custom block next to each other (e.g. merge conflict buttons).
    fn spacer_pattern_period(line_height: f32, target_height: f32) -> f32 {
        let k_approx = line_height / (2.0 * target_height);
        let k_floor = (k_approx.floor() as u32).max(1);
        let k_ceil = (k_approx.ceil() as u32).max(1);

        let size_floor = line_height / (2 * k_floor) as f32;
        let size_ceil = line_height / (2 * k_ceil) as f32;

        if (size_floor - target_height).abs() <= (size_ceil - target_height).abs() {
            size_floor
        } else {
            size_ceil
        }
    }

    pub fn render_spacer_block(
        block_id: BlockId,
        block_height: u32,
        line_height: Pixels,
        indent_guide_padding: Pixels,
        window: &mut Window,
        cx: &App,
    ) -> AnyElement {
        let target_size = 16.0;
        let scale = window.scale_factor();
        let pattern_size =
            Self::spacer_pattern_period(f32::from(line_height) * scale, target_size * scale);
        let color = cx.theme().colors().panel_background;
        let background = pattern_slash(color, 2.0, pattern_size - 2.0);

        div()
            .id(block_id)
            .cursor(CursorStyle::Arrow)
            .w_full()
            .h((block_height as f32) * line_height)
            .flex()
            .flex_row()
            .child(div().flex_shrink_0().w(indent_guide_padding).h_full())
            .child(
                div()
                    .flex_1()
                    .h_full()
                    .relative()
                    .overflow_x_hidden()
                    .child(
                        div()
                            .absolute()
                            .top_0()
                            .bottom_0()
                            .right_0()
                            .left(-indent_guide_padding)
                            .bg(background),
                    ),
            )
            .into_any()
    }

    fn render_blocks(
        &self,
        rows: Range<DisplayRow>,
        snapshot: &EditorSnapshot,
        hitbox: &Hitbox,
        text_hitbox: &Hitbox,
        editor_width: Pixels,
        scroll_width: &mut Pixels,
        editor_margins: &EditorMargins,
        em_width: Pixels,
        text_x: Pixels,
        line_height: Pixels,
        line_layouts: &mut [LineWithInvisibles],
        selections: &[Selection<Point>],
        selected_buffer_ids: &Vec<BufferId>,
        latest_selection_anchors: &HashMap<BufferId, Anchor>,
        is_row_soft_wrapped: impl Copy + Fn(usize) -> bool,
        sticky_header_excerpt_id: Option<BufferId>,
        indent_guides: &Option<Vec<IndentGuideLayout>>,
        window: &mut Window,
        cx: &mut App,
    ) -> RenderBlocksOutput {
        let (fixed_blocks, non_fixed_blocks) = snapshot
            .blocks_in_range(rows.clone())
            .partition::<Vec<_>, _>(|(_, block)| block.style() == BlockStyle::Fixed);

        let mut focused_block = self
            .editor
            .update(cx, |editor, _| editor.take_focused_block());
        let mut fixed_block_max_width = Pixels::ZERO;
        let mut blocks = Vec::new();
        let mut spacer_blocks = Vec::new();
        let mut resized_blocks = HashMap::default();
        let mut row_block_types = HashMap::default();
        let mut block_resize_offset: i32 = 0;

        for (row, block) in fixed_blocks {
            let block_id = block.id();

            if focused_block.as_ref().is_some_and(|b| b.id == block_id) {
                focused_block = None;
            }

            if let Some((element, element_size, row, x_offset)) = self.render_block(
                block,
                AvailableSpace::MinContent,
                block_id,
                row,
                snapshot,
                text_x,
                &rows,
                line_layouts,
                editor_margins,
                line_height,
                em_width,
                text_hitbox,
                editor_width,
                scroll_width,
                &mut resized_blocks,
                &mut row_block_types,
                selections,
                selected_buffer_ids,
                latest_selection_anchors,
                is_row_soft_wrapped,
                sticky_header_excerpt_id,
                indent_guides,
                &mut block_resize_offset,
                window,
                cx,
            ) {
                fixed_block_max_width = fixed_block_max_width.max(element_size.width + em_width);
                blocks.push(BlockLayout {
                    id: block_id,
                    x_offset,
                    row: Some(row),
                    element,
                    available_space: size(AvailableSpace::MinContent, element_size.height.into()),
                    style: BlockStyle::Fixed,
                    overlaps_gutter: true,
                    is_buffer_header: block.is_buffer_header(),
                });
            }
        }

        for (row, block) in non_fixed_blocks {
            let style = block.style();
            let width = match (style, block.place_near()) {
                (_, true) => AvailableSpace::MinContent,
                (BlockStyle::Sticky, _) => hitbox.size.width.into(),
                (BlockStyle::Flex, _) => hitbox
                    .size
                    .width
                    .max(fixed_block_max_width)
                    .max(
                        editor_margins.gutter.width + *scroll_width + editor_margins.extended_right,
                    )
                    .into(),
                (BlockStyle::Spacer, _) => hitbox
                    .size
                    .width
                    .max(fixed_block_max_width)
                    .max(*scroll_width + editor_margins.extended_right)
                    .into(),
                (BlockStyle::Fixed, _) => unreachable!(),
            };
            let block_id = block.id();

            if focused_block.as_ref().is_some_and(|b| b.id == block_id) {
                focused_block = None;
            }

            if let Some((element, element_size, row, x_offset)) = self.render_block(
                block,
                width,
                block_id,
                row,
                snapshot,
                text_x,
                &rows,
                line_layouts,
                editor_margins,
                line_height,
                em_width,
                text_hitbox,
                editor_width,
                scroll_width,
                &mut resized_blocks,
                &mut row_block_types,
                selections,
                selected_buffer_ids,
                latest_selection_anchors,
                is_row_soft_wrapped,
                sticky_header_excerpt_id,
                indent_guides,
                &mut block_resize_offset,
                window,
                cx,
            ) {
                let layout = BlockLayout {
                    id: block_id,
                    x_offset,
                    row: Some(row),
                    element,
                    available_space: size(width, element_size.height.into()),
                    style,
                    overlaps_gutter: !block.place_near() && style != BlockStyle::Spacer,
                    is_buffer_header: block.is_buffer_header(),
                };
                if style == BlockStyle::Spacer {
                    spacer_blocks.push(layout);
                } else {
                    blocks.push(layout);
                }
            }
        }

        if let Some(focused_block) = focused_block
            && let Some(focus_handle) = focused_block.focus_handle.upgrade()
            && focus_handle.is_focused(window)
            && let Some(block) = snapshot.block_for_id(focused_block.id)
        {
            let style = block.style();
            let width = match style {
                BlockStyle::Fixed => AvailableSpace::MinContent,
                BlockStyle::Flex => {
                    AvailableSpace::Definite(hitbox.size.width.max(fixed_block_max_width).max(
                        editor_margins.gutter.width + *scroll_width + editor_margins.extended_right,
                    ))
                }
                BlockStyle::Spacer => AvailableSpace::Definite(
                    hitbox
                        .size
                        .width
                        .max(fixed_block_max_width)
                        .max(*scroll_width + editor_margins.extended_right),
                ),
                BlockStyle::Sticky => AvailableSpace::Definite(hitbox.size.width),
            };

            if let Some((element, element_size, _, x_offset)) = self.render_block(
                &block,
                width,
                focused_block.id,
                rows.end,
                snapshot,
                text_x,
                &rows,
                line_layouts,
                editor_margins,
                line_height,
                em_width,
                text_hitbox,
                editor_width,
                scroll_width,
                &mut resized_blocks,
                &mut row_block_types,
                selections,
                selected_buffer_ids,
                latest_selection_anchors,
                is_row_soft_wrapped,
                sticky_header_excerpt_id,
                indent_guides,
                &mut block_resize_offset,
                window,
                cx,
            ) {
                blocks.push(BlockLayout {
                    id: block.id(),
                    x_offset,
                    row: None,
                    element,
                    available_space: size(width, element_size.height.into()),
                    style,
                    overlaps_gutter: true,
                    is_buffer_header: block.is_buffer_header(),
                });
            }
        }

        if resized_blocks.is_empty() {
            *scroll_width =
                (*scroll_width).max(fixed_block_max_width - editor_margins.gutter.width);
        }

        RenderBlocksOutput {
            non_spacer_blocks: blocks,
            spacer_blocks,
            row_block_types,
            resized_blocks: (!resized_blocks.is_empty()).then_some(resized_blocks),
        }
    }

    fn layout_blocks(
        &self,
        blocks: &mut Vec<BlockLayout>,
        hitbox: &Hitbox,
        gutter_hitbox: &Hitbox,
        line_height: Pixels,
        scroll_position: gpui::Point<ScrollOffset>,
        scroll_pixel_position: gpui::Point<ScrollPixelOffset>,
        editor_margins: &EditorMargins,
        window: &mut Window,
        cx: &mut App,
    ) {
        for block in blocks {
            let mut origin = if let Some(row) = block.row {
                hitbox.origin
                    + point(
                        block.x_offset,
                        Pixels::from(
                            (row.as_f64() - scroll_position.y)
                                * ScrollPixelOffset::from(line_height),
                        ),
                    )
            } else {
                // Position the block outside the visible area
                hitbox.origin + point(Pixels::ZERO, hitbox.size.height)
            };

            if block.style == BlockStyle::Spacer {
                origin += point(
                    gutter_hitbox.size.width + editor_margins.gutter.margin,
                    Pixels::ZERO,
                );
            }

            if !matches!(block.style, BlockStyle::Sticky) {
                origin += point(Pixels::from(-scroll_pixel_position.x), Pixels::ZERO);
            }

            let focus_handle =
                block
                    .element
                    .prepaint_as_root(origin, block.available_space, window, cx);

            if let Some(focus_handle) = focus_handle {
                self.editor.update(cx, |editor, _cx| {
                    editor.set_focused_block(FocusedBlock {
                        id: block.id,
                        focus_handle: focus_handle.downgrade(),
                    });
                });
            }
        }
    }

    fn layout_cursor_popovers(
        &self,
        line_height: Pixels,
        text_hitbox: &Hitbox,
        content_origin: gpui::Point<Pixels>,
        right_margin: Pixels,
        start_row: DisplayRow,
        scroll_pixel_position: gpui::Point<ScrollPixelOffset>,
        line_layouts: &[LineWithInvisibles],
        cursor: DisplayPoint,
        cursor_point: Point,
        style: &EditorStyle,
        window: &mut Window,
        cx: &mut App,
    ) -> Option<ContextMenuLayout> {
        let mut min_menu_height = Pixels::ZERO;
        let mut max_menu_height = Pixels::ZERO;
        let mut height_above_menu = Pixels::ZERO;
        let height_below_menu = Pixels::ZERO;
        let mut edit_prediction_popover_visible = false;
        let mut context_menu_visible = false;
        let context_menu_placement;

        {
            let editor = self.editor.read(cx);
            if editor.edit_prediction_visible_in_cursor_popover(editor.has_active_edit_prediction())
            {
                height_above_menu +=
                    editor.edit_prediction_cursor_popover_height() + POPOVER_Y_PADDING;
                edit_prediction_popover_visible = true;
            }

            if editor.context_menu_visible()
                && let Some(crate::ContextMenuOrigin::Cursor) = editor.context_menu_origin()
            {
                let (min_height_in_lines, max_height_in_lines) = editor
                    .context_menu_options
                    .as_ref()
                    .map_or((3, 12), |options| {
                        (options.min_entries_visible, options.max_entries_visible)
                    });

                min_menu_height += line_height * min_height_in_lines as f32 + POPOVER_Y_PADDING;
                max_menu_height += line_height * max_height_in_lines as f32 + POPOVER_Y_PADDING;
                context_menu_visible = true;
            }
            context_menu_placement = editor
                .context_menu_options
                .as_ref()
                .and_then(|options| options.placement.clone());
        }

        let visible = edit_prediction_popover_visible || context_menu_visible;
        if !visible {
            return None;
        }

        let cursor_row_layout = &line_layouts[cursor.row().minus(start_row) as usize];
        let target_position = content_origin
            + gpui::Point {
                x: cmp::max(
                    px(0.),
                    Pixels::from(
                        ScrollPixelOffset::from(
                            cursor_row_layout.x_for_index(cursor.column() as usize),
                        ) - scroll_pixel_position.x,
                    ),
                ),
                y: cmp::max(
                    px(0.),
                    Pixels::from(
                        cursor.row().next_row().as_f64() * ScrollPixelOffset::from(line_height)
                            - scroll_pixel_position.y,
                    ),
                ),
            };

        let viewport_bounds =
            Bounds::new(Default::default(), window.viewport_size()).extend(Edges {
                right: -right_margin - MENU_GAP,
                ..Default::default()
            });

        let min_height = height_above_menu + min_menu_height + height_below_menu;
        let max_height = height_above_menu + max_menu_height + height_below_menu;
        let (laid_out_popovers, y_flipped) = self.layout_popovers_above_or_below_line(
            target_position,
            line_height,
            min_height,
            max_height,
            context_menu_placement,
            text_hitbox,
            viewport_bounds,
            window,
            cx,
            |height, max_width_for_stable_x, y_flipped, window, cx| {
                // First layout the menu to get its size - others can be at least this wide.
                let context_menu = if context_menu_visible {
                    let menu_height = if y_flipped {
                        height - height_below_menu
                    } else {
                        height - height_above_menu
                    };
                    let mut element = self
                        .render_context_menu(line_height, menu_height, window, cx)
                        .expect("Visible context menu should always render.");
                    let size = element.layout_as_root(AvailableSpace::min_size(), window, cx);
                    Some((CursorPopoverType::CodeContextMenu, element, size))
                } else {
                    None
                };
                let min_width = context_menu
                    .as_ref()
                    .map_or(px(0.), |(_, _, size)| size.width);
                let max_width = max_width_for_stable_x.max(
                    context_menu
                        .as_ref()
                        .map_or(px(0.), |(_, _, size)| size.width),
                );

                let edit_prediction = if edit_prediction_popover_visible {
                    self.editor.update(cx, move |editor, cx| {
                        let mut element = editor.render_edit_prediction_cursor_popover(
                            min_width,
                            max_width,
                            cursor_point,
                            style,
                            window,
                            cx,
                        )?;
                        let size = element.layout_as_root(AvailableSpace::min_size(), window, cx);
                        Some((CursorPopoverType::EditPrediction, element, size))
                    })
                } else {
                    None
                };
                vec![edit_prediction, context_menu]
                    .into_iter()
                    .flatten()
                    .collect::<Vec<_>>()
            },
        )?;

        let (menu_ix, (_, menu_bounds)) = laid_out_popovers
            .iter()
            .find_position(|(x, _)| matches!(x, CursorPopoverType::CodeContextMenu))?;
        let last_ix = laid_out_popovers.len() - 1;
        let menu_is_last = menu_ix == last_ix;
        let first_popover_bounds = laid_out_popovers[0].1;
        let last_popover_bounds = laid_out_popovers[last_ix].1;

        // Bounds to layout the aside around. When y_flipped, the aside goes either above or to the
        // right, and otherwise it goes below or to the right.
        let mut target_bounds = Bounds::from_corners(
            first_popover_bounds.origin,
            last_popover_bounds.bottom_right(),
        );
        target_bounds.size.width = menu_bounds.size.width;

        // Like `target_bounds`, but with the max height it could occupy. Choosing an aside position
        // based on this is preferred for layout stability.
        let mut max_target_bounds = target_bounds;
        max_target_bounds.size.height = max_height;
        if y_flipped {
            max_target_bounds.origin.y -= max_height - target_bounds.size.height;
        }

        // Add spacing around `target_bounds` and `max_target_bounds`.
        let mut extend_amount = Edges::all(MENU_GAP);
        if y_flipped {
            extend_amount.bottom = line_height;
        } else {
            extend_amount.top = line_height;
        }
        let target_bounds = target_bounds.extend(extend_amount);
        let max_target_bounds = max_target_bounds.extend(extend_amount);

        let must_place_above_or_below =
            if y_flipped && !menu_is_last && menu_bounds.size.height < max_menu_height {
                laid_out_popovers[menu_ix + 1..]
                    .iter()
                    .any(|(_, popover_bounds)| popover_bounds.size.width > menu_bounds.size.width)
            } else {
                false
            };

        let aside_bounds = self.layout_context_menu_aside(
            y_flipped,
            *menu_bounds,
            target_bounds,
            max_target_bounds,
            max_menu_height,
            must_place_above_or_below,
            text_hitbox,
            viewport_bounds,
            window,
            cx,
        );

        if let Some(menu_bounds) = laid_out_popovers.iter().find_map(|(popover_type, bounds)| {
            if matches!(popover_type, CursorPopoverType::CodeContextMenu) {
                Some(*bounds)
            } else {
                None
            }
        }) {
            let bounds = if let Some(aside_bounds) = aside_bounds {
                menu_bounds.union(&aside_bounds)
            } else {
                menu_bounds
            };
            return Some(ContextMenuLayout { y_flipped, bounds });
        }

        None
    }

    fn layout_gutter_menu(
        &self,
        line_height: Pixels,
        text_hitbox: &Hitbox,
        content_origin: gpui::Point<Pixels>,
        right_margin: Pixels,
        scroll_pixel_position: gpui::Point<ScrollPixelOffset>,
        gutter_overshoot: Pixels,
        window: &mut Window,
        cx: &mut App,
    ) {
        let editor = self.editor.read(cx);
        if !editor.context_menu_visible() {
            return;
        }
        let Some(crate::ContextMenuOrigin::GutterIndicator(gutter_row)) =
            editor.context_menu_origin()
        else {
            return;
        };
        // Context menu was spawned via a click on a gutter. Ensure it's a bit closer to the
        // indicator than just a plain first column of the text field.
        let target_position = content_origin
            + gpui::Point {
                x: -gutter_overshoot,
                y: Pixels::from(
                    gutter_row.next_row().as_f64() * ScrollPixelOffset::from(line_height)
                        - scroll_pixel_position.y,
                ),
            };

        let (min_height_in_lines, max_height_in_lines) = editor
            .context_menu_options
            .as_ref()
            .map_or((3, 12), |options| {
                (options.min_entries_visible, options.max_entries_visible)
            });

        let min_height = line_height * min_height_in_lines as f32 + POPOVER_Y_PADDING;
        let max_height = line_height * max_height_in_lines as f32 + POPOVER_Y_PADDING;
        let viewport_bounds =
            Bounds::new(Default::default(), window.viewport_size()).extend(Edges {
                right: -right_margin - MENU_GAP,
                ..Default::default()
            });
        self.layout_popovers_above_or_below_line(
            target_position,
            line_height,
            min_height,
            max_height,
            editor
                .context_menu_options
                .as_ref()
                .and_then(|options| options.placement.clone()),
            text_hitbox,
            viewport_bounds,
            window,
            cx,
            move |height, _max_width_for_stable_x, _, window, cx| {
                let mut element = self
                    .render_context_menu(line_height, height, window, cx)
                    .expect("Visible context menu should always render.");
                let size = element.layout_as_root(AvailableSpace::min_size(), window, cx);
                vec![(CursorPopoverType::CodeContextMenu, element, size)]
            },
        );
    }

    fn layout_popovers_above_or_below_line(
        &self,
        target_position: gpui::Point<Pixels>,
        line_height: Pixels,
        min_height: Pixels,
        max_height: Pixels,
        placement: Option<ContextMenuPlacement>,
        text_hitbox: &Hitbox,
        viewport_bounds: Bounds<Pixels>,
        window: &mut Window,
        cx: &mut App,
        make_sized_popovers: impl FnOnce(
            Pixels,
            Pixels,
            bool,
            &mut Window,
            &mut App,
        ) -> Vec<(CursorPopoverType, AnyElement, Size<Pixels>)>,
    ) -> Option<(Vec<(CursorPopoverType, Bounds<Pixels>)>, bool)> {
        let text_style = TextStyleRefinement {
            line_height: Some(DefiniteLength::Fraction(
                BufferLineHeight::Comfortable.value(),
            )),
            ..Default::default()
        };
        window.with_text_style(Some(text_style), |window| {
            // If the max height won't fit below and there is more space above, put it above the line.
            let bottom_y_when_flipped = target_position.y - line_height;
            let available_above = bottom_y_when_flipped - text_hitbox.top();
            let available_below = text_hitbox.bottom() - target_position.y;
            let y_overflows_below = max_height > available_below;
            let mut y_flipped = match placement {
                Some(ContextMenuPlacement::Above) => true,
                Some(ContextMenuPlacement::Below) => false,
                None => y_overflows_below && available_above > available_below,
            };
            let mut height = cmp::min(
                max_height,
                if y_flipped {
                    available_above
                } else {
                    available_below
                },
            );

            // If the min height doesn't fit within text bounds, instead fit within the window.
            if height < min_height {
                let available_above = bottom_y_when_flipped;
                let available_below = viewport_bounds.bottom() - target_position.y;
                let (y_flipped_override, height_override) = match placement {
                    Some(ContextMenuPlacement::Above) => {
                        (true, cmp::min(available_above, min_height))
                    }
                    Some(ContextMenuPlacement::Below) => {
                        (false, cmp::min(available_below, min_height))
                    }
                    None => {
                        if available_below > min_height {
                            (false, min_height)
                        } else if available_above > min_height {
                            (true, min_height)
                        } else if available_above > available_below {
                            (true, available_above)
                        } else {
                            (false, available_below)
                        }
                    }
                };
                y_flipped = y_flipped_override;
                height = height_override;
            }

            let max_width_for_stable_x = viewport_bounds.right() - target_position.x;

            // TODO: Use viewport_bounds.width as a max width so that it doesn't get clipped on the left
            // for very narrow windows.
            let popovers =
                make_sized_popovers(height, max_width_for_stable_x, y_flipped, window, cx);
            if popovers.is_empty() {
                return None;
            }

            let max_width = popovers
                .iter()
                .map(|(_, _, size)| size.width)
                .max()
                .unwrap_or_default();

            let mut current_position = gpui::Point {
                // Snap the right edge of the list to the right edge of the window if its horizontal bounds
                // overflow. Include space for the scrollbar.
                x: target_position
                    .x
                    .min((viewport_bounds.right() - max_width).max(Pixels::ZERO)),
                y: if y_flipped {
                    bottom_y_when_flipped
                } else {
                    target_position.y
                },
            };

            let mut laid_out_popovers = popovers
                .into_iter()
                .map(|(popover_type, element, size)| {
                    if y_flipped {
                        current_position.y -= size.height;
                    }
                    let position = current_position;
                    window.defer_draw(element, current_position, 1, None);
                    if !y_flipped {
                        current_position.y += size.height + MENU_GAP;
                    } else {
                        current_position.y -= MENU_GAP;
                    }
                    (popover_type, Bounds::new(position, size))
                })
                .collect::<Vec<_>>();

            if y_flipped {
                laid_out_popovers.reverse();
            }

            Some((laid_out_popovers, y_flipped))
        })
    }

    fn layout_context_menu_aside(
        &self,
        y_flipped: bool,
        menu_bounds: Bounds<Pixels>,
        target_bounds: Bounds<Pixels>,
        max_target_bounds: Bounds<Pixels>,
        max_height: Pixels,
        must_place_above_or_below: bool,
        text_hitbox: &Hitbox,
        viewport_bounds: Bounds<Pixels>,
        window: &mut Window,
        cx: &mut App,
    ) -> Option<Bounds<Pixels>> {
        let available_within_viewport = target_bounds.space_within(&viewport_bounds);
        let positioned_aside = if available_within_viewport.right >= MENU_ASIDE_MIN_WIDTH
            && !must_place_above_or_below
        {
            let max_width = cmp::min(
                available_within_viewport.right - px(1.),
                MENU_ASIDE_MAX_WIDTH,
            );
            let mut aside = self.render_context_menu_aside(
                size(max_width, max_height - POPOVER_Y_PADDING),
                window,
                cx,
            )?;
            let size = aside.layout_as_root(AvailableSpace::min_size(), window, cx);
            let right_position = point(target_bounds.right(), menu_bounds.origin.y);
            Some((aside, right_position, size))
        } else {
            let max_size = size(
                // TODO(mgsloan): Once the menu is bounded by viewport width the bound on viewport
                // won't be needed here.
                cmp::min(
                    cmp::max(menu_bounds.size.width - px(2.), MENU_ASIDE_MIN_WIDTH),
                    viewport_bounds.right(),
                ),
                cmp::min(
                    max_height,
                    cmp::max(
                        available_within_viewport.top,
                        available_within_viewport.bottom,
                    ),
                ) - POPOVER_Y_PADDING,
            );
            let mut aside = self.render_context_menu_aside(max_size, window, cx)?;
            let actual_size = aside.layout_as_root(AvailableSpace::min_size(), window, cx);

            let top_position = point(
                menu_bounds.origin.x,
                target_bounds.top() - actual_size.height,
            );
            let bottom_position = point(menu_bounds.origin.x, target_bounds.bottom());

            let fit_within = |available: Edges<Pixels>, wanted: Size<Pixels>| {
                // Prefer to fit on the same side of the line as the menu, then on the other side of
                // the line.
                if !y_flipped && wanted.height < available.bottom {
                    Some(bottom_position)
                } else if !y_flipped && wanted.height < available.top {
                    Some(top_position)
                } else if y_flipped && wanted.height < available.top {
                    Some(top_position)
                } else if y_flipped && wanted.height < available.bottom {
                    Some(bottom_position)
                } else {
                    None
                }
            };

            // Prefer choosing a direction using max sizes rather than actual size for stability.
            let available_within_text = max_target_bounds.space_within(&text_hitbox.bounds);
            let wanted = size(MENU_ASIDE_MAX_WIDTH, max_height);
            let aside_position = fit_within(available_within_text, wanted)
                // Fallback: fit max size in window.
                .or_else(|| fit_within(max_target_bounds.space_within(&viewport_bounds), wanted))
                // Fallback: fit actual size in window.
                .or_else(|| fit_within(available_within_viewport, actual_size));

            aside_position.map(|position| (aside, position, actual_size))
        };

        // Skip drawing if it doesn't fit anywhere.
        if let Some((aside, position, size)) = positioned_aside {
            let aside_bounds = Bounds::new(position, size);
            window.defer_draw(aside, position, 2, None);
            return Some(aside_bounds);
        }

        None
    }

    fn render_context_menu(
        &self,
        line_height: Pixels,
        height: Pixels,
        window: &mut Window,
        cx: &mut App,
    ) -> Option<AnyElement> {
        let max_height_in_lines = ((height - POPOVER_Y_PADDING) / line_height).floor() as u32;
        self.editor.update(cx, |editor, cx| {
            editor.render_context_menu(max_height_in_lines, window, cx)
        })
    }

    fn render_context_menu_aside(
        &self,
        max_size: Size<Pixels>,
        window: &mut Window,
        cx: &mut App,
    ) -> Option<AnyElement> {
        if max_size.width < px(100.) || max_size.height < px(12.) {
            None
        } else {
            self.editor.update(cx, |editor, cx| {
                editor.render_context_menu_aside(max_size, window, cx)
            })
        }
    }

    fn layout_hover_popovers(
        &self,
        snapshot: &EditorSnapshot,
        hitbox: &Hitbox,
        visible_display_row_range: Range<DisplayRow>,
        content_origin: gpui::Point<Pixels>,
        scroll_pixel_position: gpui::Point<ScrollPixelOffset>,
        line_layouts: &[LineWithInvisibles],
        line_height: Pixels,
        em_width: Pixels,
        context_menu_layout: Option<ContextMenuLayout>,
        window: &mut Window,
        cx: &mut App,
    ) {
        struct MeasuredHoverPopover {
            element: AnyElement,
            size: Size<Pixels>,
            horizontal_offset: Pixels,
        }

        let max_size = size(
            (120. * em_width) // Default size
                .min(hitbox.size.width / 2.) // Shrink to half of the editor width
                .max(MIN_POPOVER_CHARACTER_WIDTH * em_width), // Apply minimum width of 20 characters
            (16. * line_height) // Default size
                .min(hitbox.size.height / 2.) // Shrink to half of the editor height
                .max(MIN_POPOVER_LINE_HEIGHT * line_height), // Apply minimum height of 4 lines
        );

        // Don't show hover popovers when context menu is open to avoid overlap
        let has_context_menu = self.editor.read(cx).mouse_context_menu.is_some();
        if has_context_menu {
            return;
        }

        let hover_popovers = self.editor.update(cx, |editor, cx| {
            editor.hover_state.render(
                snapshot,
                visible_display_row_range.clone(),
                max_size,
                &editor.text_layout_details(window, cx),
                window,
                cx,
            )
        });
        let Some((popover_position, hover_popovers)) = hover_popovers else {
            return;
        };

        // This is safe because we check on layout whether the required row is available
        let hovered_row_layout = &line_layouts[popover_position
            .row()
            .minus(visible_display_row_range.start)
            as usize];

        // Compute Hovered Point
        let x = hovered_row_layout.x_for_index(popover_position.column() as usize)
            - Pixels::from(scroll_pixel_position.x);
        let y = Pixels::from(
            popover_position.row().as_f64() * ScrollPixelOffset::from(line_height)
                - scroll_pixel_position.y,
        );
        let hovered_point = content_origin + point(x, y);

        let mut overall_height = Pixels::ZERO;
        let mut measured_hover_popovers = Vec::new();
        for (position, mut hover_popover) in hover_popovers.into_iter().with_position() {
            let size = hover_popover.layout_as_root(AvailableSpace::min_size(), window, cx);
            let horizontal_offset =
                (hitbox.top_right().x - POPOVER_RIGHT_OFFSET - (hovered_point.x + size.width))
                    .min(Pixels::ZERO);
            match position {
                itertools::Position::Middle | itertools::Position::Last => {
                    overall_height += HOVER_POPOVER_GAP
                }
                _ => {}
            }
            overall_height += size.height;
            measured_hover_popovers.push(MeasuredHoverPopover {
                element: hover_popover,
                size,
                horizontal_offset,
            });
        }

        fn draw_occluder(
            width: Pixels,
            origin: gpui::Point<Pixels>,
            window: &mut Window,
            cx: &mut App,
        ) {
            let mut occlusion = div()
                .size_full()
                .occlude()
                .on_mouse_move(|_, _, cx| cx.stop_propagation())
                .into_any_element();
            occlusion.layout_as_root(size(width, HOVER_POPOVER_GAP).into(), window, cx);
            window.defer_draw(occlusion, origin, 2, None);
        }

        fn place_popovers_above(
            hovered_point: gpui::Point<Pixels>,
            measured_hover_popovers: Vec<MeasuredHoverPopover>,
            window: &mut Window,
            cx: &mut App,
        ) {
            let mut current_y = hovered_point.y;
            for (position, popover) in measured_hover_popovers.into_iter().with_position() {
                let size = popover.size;
                let popover_origin = point(
                    hovered_point.x + popover.horizontal_offset,
                    current_y - size.height,
                );

                window.defer_draw(popover.element, popover_origin, 2, None);
                if position != itertools::Position::Last {
                    let origin = point(popover_origin.x, popover_origin.y - HOVER_POPOVER_GAP);
                    draw_occluder(size.width, origin, window, cx);
                }

                current_y = popover_origin.y - HOVER_POPOVER_GAP;
            }
        }

        fn place_popovers_below(
            hovered_point: gpui::Point<Pixels>,
            measured_hover_popovers: Vec<MeasuredHoverPopover>,
            line_height: Pixels,
            window: &mut Window,
            cx: &mut App,
        ) {
            let mut current_y = hovered_point.y + line_height;
            for (position, popover) in measured_hover_popovers.into_iter().with_position() {
                let size = popover.size;
                let popover_origin = point(hovered_point.x + popover.horizontal_offset, current_y);

                window.defer_draw(popover.element, popover_origin, 2, None);
                if position != itertools::Position::Last {
                    let origin = point(popover_origin.x, popover_origin.y + size.height);
                    draw_occluder(size.width, origin, window, cx);
                }

                current_y = popover_origin.y + size.height + HOVER_POPOVER_GAP;
            }
        }

        let intersects_menu = |bounds: Bounds<Pixels>| -> bool {
            context_menu_layout
                .as_ref()
                .is_some_and(|menu| bounds.intersects(&menu.bounds))
        };

        let can_place_above = {
            let mut bounds_above = Vec::new();
            let mut current_y = hovered_point.y;
            for popover in &measured_hover_popovers {
                let size = popover.size;
                let popover_origin = point(
                    hovered_point.x + popover.horizontal_offset,
                    current_y - size.height,
                );
                bounds_above.push(Bounds::new(popover_origin, size));
                current_y = popover_origin.y - HOVER_POPOVER_GAP;
            }
            bounds_above
                .iter()
                .all(|b| b.is_contained_within(hitbox) && !intersects_menu(*b))
        };

        let can_place_below = || {
            let mut bounds_below = Vec::new();
            let mut current_y = hovered_point.y + line_height;
            for popover in &measured_hover_popovers {
                let size = popover.size;
                let popover_origin = point(hovered_point.x + popover.horizontal_offset, current_y);
                bounds_below.push(Bounds::new(popover_origin, size));
                current_y = popover_origin.y + size.height + HOVER_POPOVER_GAP;
            }
            bounds_below
                .iter()
                .all(|b| b.is_contained_within(hitbox) && !intersects_menu(*b))
        };

        if can_place_above {
            // try placing above hovered point
            place_popovers_above(hovered_point, measured_hover_popovers, window, cx);
        } else if can_place_below() {
            // try placing below hovered point
            place_popovers_below(
                hovered_point,
                measured_hover_popovers,
                line_height,
                window,
                cx,
            );
        } else {
            // try to place popovers around the context menu
            let origin_surrounding_menu = context_menu_layout.as_ref().and_then(|menu| {
                let total_width = measured_hover_popovers
                    .iter()
                    .map(|p| p.size.width)
                    .max()
                    .unwrap_or(Pixels::ZERO);
                let y_for_horizontal_positioning = if menu.y_flipped {
                    menu.bounds.bottom() - overall_height
                } else {
                    menu.bounds.top()
                };
                let possible_origins = vec![
                    // left of context menu
                    point(
                        menu.bounds.left() - total_width - HOVER_POPOVER_GAP,
                        y_for_horizontal_positioning,
                    ),
                    // right of context menu
                    point(
                        menu.bounds.right() + HOVER_POPOVER_GAP,
                        y_for_horizontal_positioning,
                    ),
                    // top of context menu
                    point(
                        menu.bounds.left(),
                        menu.bounds.top() - overall_height - HOVER_POPOVER_GAP,
                    ),
                    // bottom of context menu
                    point(menu.bounds.left(), menu.bounds.bottom() + HOVER_POPOVER_GAP),
                ];
                possible_origins.into_iter().find(|&origin| {
                    Bounds::new(origin, size(total_width, overall_height))
                        .is_contained_within(hitbox)
                })
            });
            if let Some(origin) = origin_surrounding_menu {
                let mut current_y = origin.y;
                for (position, popover) in measured_hover_popovers.into_iter().with_position() {
                    let size = popover.size;
                    let popover_origin = point(origin.x, current_y);

                    window.defer_draw(popover.element, popover_origin, 2, None);
                    if position != itertools::Position::Last {
                        let origin = point(popover_origin.x, popover_origin.y + size.height);
                        draw_occluder(size.width, origin, window, cx);
                    }

                    current_y = popover_origin.y + size.height + HOVER_POPOVER_GAP;
                }
            } else {
                // fallback to existing above/below cursor logic
                // this might overlap menu or overflow in rare case
                if can_place_above {
                    place_popovers_above(hovered_point, measured_hover_popovers, window, cx);
                } else {
                    place_popovers_below(
                        hovered_point,
                        measured_hover_popovers,
                        line_height,
                        window,
                        cx,
                    );
                }
            }
        }
    }

    fn layout_word_diff_highlights(
        display_hunks: &[(DisplayDiffHunk, Option<Hitbox>)],
        row_infos: &[RowInfo],
        start_row: DisplayRow,
        snapshot: &EditorSnapshot,
        highlighted_ranges: &mut Vec<(Range<DisplayPoint>, Hsla)>,
        cx: &mut App,
    ) {
        let colors = cx.theme().colors();

        let word_highlights = display_hunks
            .into_iter()
            .filter_map(|(hunk, _)| match hunk {
                DisplayDiffHunk::Unfolded {
                    word_diffs, status, ..
                } => Some((word_diffs, status)),
                _ => None,
            })
            .filter(|(_, status)| status.is_modified())
            .flat_map(|(word_diffs, _)| word_diffs)
            .flat_map(|word_diff| {
                let display_ranges = snapshot
                    .display_snapshot
                    .isomorphic_display_point_ranges_for_buffer_range(
                        word_diff.start..word_diff.end,
                    );

                display_ranges.into_iter().filter_map(|range| {
                    let start_row_offset = range.start.row().0.saturating_sub(start_row.0) as usize;

                    let diff_status = row_infos
                        .get(start_row_offset)
                        .and_then(|row_info| row_info.diff_status)?;

                    let background_color = match diff_status.kind {
                        DiffHunkStatusKind::Added => colors.version_control_word_added,
                        DiffHunkStatusKind::Deleted => colors.version_control_word_deleted,
                        DiffHunkStatusKind::Modified => {
                            debug_panic!("modified diff status for row info");
                            return None;
                        }
                    };

                    Some((range, background_color))
                })
            });

        highlighted_ranges.extend(word_highlights);
    }

    fn layout_diff_hunk_controls(
        &self,
        row_range: Range<DisplayRow>,
        row_infos: &[RowInfo],
        text_hitbox: &Hitbox,
        newest_cursor_row: Option<DisplayRow>,
        line_height: Pixels,
        right_margin: Pixels,
        scroll_pixel_position: gpui::Point<ScrollPixelOffset>,
        sticky_header_height: Pixels,
        display_hunks: &[(DisplayDiffHunk, Option<Hitbox>)],
        highlighted_rows: &BTreeMap<DisplayRow, LineHighlight>,
        editor: Entity<Editor>,
        window: &mut Window,
        cx: &mut App,
    ) -> (Vec<AnyElement>, Vec<(DisplayRow, Bounds<Pixels>)>) {
        let render_diff_hunk_controls = editor.read(cx).render_diff_hunk_controls.clone();
        let hovered_diff_hunk_row = editor.read(cx).hovered_diff_hunk_row;
        let sticky_top = text_hitbox.bounds.top() + sticky_header_height;

        let mut controls = vec![];
        let mut control_bounds = vec![];

        let active_rows = [hovered_diff_hunk_row, newest_cursor_row];

        for (hunk, _) in display_hunks {
            if let DisplayDiffHunk::Unfolded {
                display_row_range,
                multi_buffer_range,
                status,
                is_created_file,
                ..
            } = &hunk
            {
                if display_row_range.start >= row_range.end {
                    // hunk is fully below the viewport
                    continue;
                }
                if display_row_range.end <= row_range.start {
                    // hunk is fully above the viewport
                    continue;
                }
                let row_ix = display_row_range.start.0.saturating_sub(row_range.start.0);
                if row_infos
                    .get(row_ix as usize)
                    .and_then(|row_info| row_info.diff_status)
                    .is_none()
                {
                    continue;
                }
                if highlighted_rows
                    .get(&display_row_range.start)
                    .and_then(|highlight| highlight.type_id)
                    .is_some_and(|type_id| {
                        [
                            TypeId::of::<ConflictsOuter>(),
                            TypeId::of::<ConflictsOursMarker>(),
                            TypeId::of::<ConflictsOurs>(),
                            TypeId::of::<ConflictsTheirs>(),
                            TypeId::of::<ConflictsTheirsMarker>(),
                        ]
                        .contains(&type_id)
                    })
                {
                    continue;
                }

                if active_rows
                    .iter()
                    .any(|row| row.is_some_and(|row| display_row_range.contains(&row)))
                {
                    let hunk_start_y: Pixels = (display_row_range.start.as_f64()
                        * ScrollPixelOffset::from(line_height)
                        + ScrollPixelOffset::from(text_hitbox.bounds.top())
                        - scroll_pixel_position.y)
                        .into();

                    let y: Pixels = if hunk_start_y >= sticky_top {
                        hunk_start_y
                    } else {
                        let hunk_end_y: Pixels = hunk_start_y
                            + (display_row_range.len() as f64
                                * ScrollPixelOffset::from(line_height))
                            .into();
                        let max_y = hunk_end_y - line_height;
                        sticky_top.min(max_y)
                    };

                    let mut element = render_diff_hunk_controls(
                        display_row_range.start.0,
                        status,
                        multi_buffer_range.clone(),
                        *is_created_file,
                        line_height,
                        &editor,
                        window,
                        cx,
                    );
                    let size =
                        element.layout_as_root(size(px(100.0), line_height).into(), window, cx);

                    let x = text_hitbox.bounds.right() - right_margin - px(10.) - size.width;

                    if x < text_hitbox.bounds.left() {
                        continue;
                    }

                    let bounds = Bounds::new(gpui::Point::new(x, y), size);
                    control_bounds.push((display_row_range.start, bounds));

                    window.with_absolute_element_offset(gpui::Point::new(x, y), |window| {
                        element.prepaint(window, cx)
                    });
                    controls.push(element);
                }
            }
        }

        (controls, control_bounds)
    }

    fn layout_signature_help(
        &self,
        hitbox: &Hitbox,
        content_origin: gpui::Point<Pixels>,
        scroll_pixel_position: gpui::Point<ScrollPixelOffset>,
        newest_selection_head: Option<DisplayPoint>,
        start_row: DisplayRow,
        line_layouts: &[LineWithInvisibles],
        line_height: Pixels,
        em_width: Pixels,
        context_menu_layout: Option<ContextMenuLayout>,
        window: &mut Window,
        cx: &mut App,
    ) {
        if !self.editor.focus_handle(cx).is_focused(window) {
            return;
        }
        let Some(newest_selection_head) = newest_selection_head else {
            return;
        };

        let max_size = size(
            (120. * em_width) // Default size
                .min(hitbox.size.width / 2.) // Shrink to half of the editor width
                .max(MIN_POPOVER_CHARACTER_WIDTH * em_width), // Apply minimum width of 20 characters
            (16. * line_height) // Default size
                .min(hitbox.size.height / 2.) // Shrink to half of the editor height
                .max(MIN_POPOVER_LINE_HEIGHT * line_height), // Apply minimum height of 4 lines
        );

        let maybe_element = self.editor.update(cx, |editor, cx| {
            if let Some(popover) = editor.signature_help_state.popover_mut() {
                let element = popover.render(max_size, window, cx);
                Some(element)
            } else {
                None
            }
        });
        let Some(mut element) = maybe_element else {
            return;
        };

        let selection_row = newest_selection_head.row();
        let Some(cursor_row_layout) = (selection_row >= start_row)
            .then(|| line_layouts.get(selection_row.minus(start_row) as usize))
            .flatten()
        else {
            return;
        };

        let target_x = cursor_row_layout.x_for_index(newest_selection_head.column() as usize)
            - Pixels::from(scroll_pixel_position.x);
        let target_y = Pixels::from(
            selection_row.as_f64() * ScrollPixelOffset::from(line_height) - scroll_pixel_position.y,
        );
        let target_point = content_origin + point(target_x, target_y);

        let actual_size = element.layout_as_root(Size::<AvailableSpace>::default(), window, cx);

        let (popover_bounds_above, popover_bounds_below) = {
            let horizontal_offset = (hitbox.top_right().x
                - POPOVER_RIGHT_OFFSET
                - (target_point.x + actual_size.width))
                .min(Pixels::ZERO);
            let initial_x = target_point.x + horizontal_offset;
            (
                Bounds::new(
                    point(initial_x, target_point.y - actual_size.height),
                    actual_size,
                ),
                Bounds::new(
                    point(initial_x, target_point.y + line_height + HOVER_POPOVER_GAP),
                    actual_size,
                ),
            )
        };

        let intersects_menu = |bounds: Bounds<Pixels>| -> bool {
            context_menu_layout
                .as_ref()
                .is_some_and(|menu| bounds.intersects(&menu.bounds))
        };

        let final_origin = if popover_bounds_above.is_contained_within(hitbox)
            && !intersects_menu(popover_bounds_above)
        {
            // try placing above cursor
            popover_bounds_above.origin
        } else if popover_bounds_below.is_contained_within(hitbox)
            && !intersects_menu(popover_bounds_below)
        {
            // try placing below cursor
            popover_bounds_below.origin
        } else {
            // try surrounding context menu if exists
            let origin_surrounding_menu = context_menu_layout.as_ref().and_then(|menu| {
                let y_for_horizontal_positioning = if menu.y_flipped {
                    menu.bounds.bottom() - actual_size.height
                } else {
                    menu.bounds.top()
                };
                let possible_origins = vec![
                    // left of context menu
                    point(
                        menu.bounds.left() - actual_size.width - HOVER_POPOVER_GAP,
                        y_for_horizontal_positioning,
                    ),
                    // right of context menu
                    point(
                        menu.bounds.right() + HOVER_POPOVER_GAP,
                        y_for_horizontal_positioning,
                    ),
                    // top of context menu
                    point(
                        menu.bounds.left(),
                        menu.bounds.top() - actual_size.height - HOVER_POPOVER_GAP,
                    ),
                    // bottom of context menu
                    point(menu.bounds.left(), menu.bounds.bottom() + HOVER_POPOVER_GAP),
                ];
                possible_origins
                    .into_iter()
                    .find(|&origin| Bounds::new(origin, actual_size).is_contained_within(hitbox))
            });
            origin_surrounding_menu.unwrap_or_else(|| {
                // fallback to existing above/below cursor logic
                // this might overlap menu or overflow in rare case
                if popover_bounds_above.is_contained_within(hitbox) {
                    popover_bounds_above.origin
                } else {
                    popover_bounds_below.origin
                }
            })
        };

        window.defer_draw(element, final_origin, 2, None);
    }

    fn paint_background(&self, layout: &EditorLayout, window: &mut Window, cx: &mut App) {
        window.paint_layer(layout.hitbox.bounds, |window| {
            let scroll_top = layout.position_map.scroll_position.y;
            let gutter_bg = cx.theme().colors().editor_gutter_background;
            window.paint_quad(fill(layout.gutter_hitbox.bounds, gutter_bg));
            window.paint_quad(fill(
                layout.position_map.text_hitbox.bounds,
                self.style.background,
            ));

            if matches!(
                layout.mode,
                EditorMode::Full { .. } | EditorMode::Minimap { .. }
            ) {
                let show_active_line_background = match layout.mode {
                    EditorMode::Full {
                        show_active_line_background,
                        ..
                    } => show_active_line_background,
                    EditorMode::Minimap { .. } => true,
                    _ => false,
                };
                let mut active_rows = layout.active_rows.iter().peekable();
                while let Some((start_row, contains_non_empty_selection)) = active_rows.next() {
                    let mut end_row = start_row.0;
                    while active_rows
                        .peek()
                        .is_some_and(|(active_row, has_selection)| {
                            active_row.0 == end_row + 1
                                && has_selection.selection == contains_non_empty_selection.selection
                        })
                    {
                        active_rows.next().unwrap();
                        end_row += 1;
                    }

                    if show_active_line_background && !contains_non_empty_selection.selection {
                        let highlight_h_range =
                            match layout.position_map.snapshot.current_line_highlight {
                                CurrentLineHighlight::Gutter => Some(Range {
                                    start: layout.hitbox.left(),
                                    end: layout.gutter_hitbox.right(),
                                }),
                                CurrentLineHighlight::Line => Some(Range {
                                    start: layout.position_map.text_hitbox.bounds.left(),
                                    end: layout.position_map.text_hitbox.bounds.right(),
                                }),
                                CurrentLineHighlight::All => Some(Range {
                                    start: layout.hitbox.left(),
                                    end: layout.hitbox.right(),
                                }),
                                CurrentLineHighlight::None => None,
                            };
                        if let Some(range) = highlight_h_range {
                            let active_line_bg = cx.theme().colors().editor_active_line_background;
                            let bounds = Bounds {
                                origin: point(
                                    range.start,
                                    layout.hitbox.origin.y
                                        + Pixels::from(
                                            (start_row.as_f64() - scroll_top)
                                                * ScrollPixelOffset::from(
                                                    layout.position_map.line_height,
                                                ),
                                        ),
                                ),
                                size: size(
                                    range.end - range.start,
                                    layout.position_map.line_height
                                        * (end_row - start_row.0 + 1) as f32,
                                ),
                            };
                            window.paint_quad(fill(bounds, active_line_bg));
                        }
                    }
                }

                let mut paint_highlight = |highlight_row_start: DisplayRow,
                                           highlight_row_end: DisplayRow,
                                           highlight: crate::LineHighlight,
                                           edges| {
                    let mut origin_x = layout.hitbox.left();
                    let mut width = layout.hitbox.size.width;
                    if !highlight.include_gutter {
                        origin_x += layout.gutter_hitbox.size.width;
                        width -= layout.gutter_hitbox.size.width;
                    }

                    let origin = point(
                        origin_x,
                        layout.hitbox.origin.y
                            + Pixels::from(
                                (highlight_row_start.as_f64() - scroll_top)
                                    * ScrollPixelOffset::from(layout.position_map.line_height),
                            ),
                    );
                    let size = size(
                        width,
                        layout.position_map.line_height
                            * highlight_row_end.next_row().minus(highlight_row_start) as f32,
                    );
                    let mut quad = fill(Bounds { origin, size }, highlight.background);
                    if let Some(border_color) = highlight.border {
                        quad.border_color = border_color;
                        quad.border_widths = edges
                    }
                    window.paint_quad(quad);
                };

                let mut current_paint: Option<(LineHighlight, Range<DisplayRow>, Edges<Pixels>)> =
                    None;
                for (&new_row, &new_background) in &layout.highlighted_rows {
                    match &mut current_paint {
                        &mut Some((current_background, ref mut current_range, mut edges)) => {
                            let new_range_started = current_background != new_background
                                || current_range.end.next_row() != new_row;
                            if new_range_started {
                                if current_range.end.next_row() == new_row {
                                    edges.bottom = px(0.);
                                };
                                paint_highlight(
                                    current_range.start,
                                    current_range.end,
                                    current_background,
                                    edges,
                                );
                                let edges = Edges {
                                    top: if current_range.end.next_row() != new_row {
                                        px(1.)
                                    } else {
                                        px(0.)
                                    },
                                    bottom: px(1.),
                                    ..Default::default()
                                };
                                current_paint = Some((new_background, new_row..new_row, edges));
                                continue;
                            } else {
                                current_range.end = current_range.end.next_row();
                            }
                        }
                        None => {
                            let edges = Edges {
                                top: px(1.),
                                bottom: px(1.),
                                ..Default::default()
                            };
                            current_paint = Some((new_background, new_row..new_row, edges))
                        }
                    };
                }
                if let Some((color, range, edges)) = current_paint {
                    paint_highlight(range.start, range.end, color, edges);
                }

                for (guide_x, active) in layout.wrap_guides.iter() {
                    let color = if *active {
                        cx.theme().colors().editor_active_wrap_guide
                    } else {
                        cx.theme().colors().editor_wrap_guide
                    };
                    window.paint_quad(fill(
                        window.pixel_snap_bounds(Bounds {
                            origin: point(*guide_x, layout.position_map.text_hitbox.origin.y),
                            size: size(px(1.), layout.position_map.text_hitbox.size.height),
                        }),
                        color,
                    ));
                }
            }
        })
    }

    fn paint_indent_guides(
        &mut self,
        layout: &mut EditorLayout,
        window: &mut Window,
        cx: &mut App,
    ) {
        let Some(indent_guides) = &layout.indent_guides else {
            return;
        };

        let faded_color = |color: Hsla, alpha: f32| {
            let mut faded = color;
            faded.a = alpha;
            faded
        };

        for indent_guide in indent_guides {
            let indent_accent_colors = cx.theme().accents().color_for_index(indent_guide.depth);
            let settings = &indent_guide.settings;

            // TODO fixed for now, expose them through themes later
            const INDENT_AWARE_ALPHA: f32 = 0.2;
            const INDENT_AWARE_ACTIVE_ALPHA: f32 = 0.4;
            const INDENT_AWARE_BACKGROUND_ALPHA: f32 = 0.1;
            const INDENT_AWARE_BACKGROUND_ACTIVE_ALPHA: f32 = 0.2;

            let line_color = match (settings.coloring, indent_guide.active) {
                (IndentGuideColoring::Disabled, _) => None,
                (IndentGuideColoring::Fixed, false) => {
                    Some(cx.theme().colors().editor_indent_guide)
                }
                (IndentGuideColoring::Fixed, true) => {
                    Some(cx.theme().colors().editor_indent_guide_active)
                }
                (IndentGuideColoring::IndentAware, false) => {
                    Some(faded_color(indent_accent_colors, INDENT_AWARE_ALPHA))
                }
                (IndentGuideColoring::IndentAware, true) => {
                    Some(faded_color(indent_accent_colors, INDENT_AWARE_ACTIVE_ALPHA))
                }
            };

            let background_color = match (settings.background_coloring, indent_guide.active) {
                (IndentGuideBackgroundColoring::Disabled, _) => None,
                (IndentGuideBackgroundColoring::IndentAware, false) => Some(faded_color(
                    indent_accent_colors,
                    INDENT_AWARE_BACKGROUND_ALPHA,
                )),
                (IndentGuideBackgroundColoring::IndentAware, true) => Some(faded_color(
                    indent_accent_colors,
                    INDENT_AWARE_BACKGROUND_ACTIVE_ALPHA,
                )),
            };

            let mut line_indicator_width = 0.;
            if let Some(requested_line_width) = settings.visible_line_width(indent_guide.active) {
                if let Some(color) = line_color {
                    window.paint_quad(fill(
                        window.pixel_snap_bounds(Bounds {
                            origin: indent_guide.origin,
                            size: size(px(requested_line_width as f32), indent_guide.length),
                        }),
                        color,
                    ));
                    line_indicator_width = requested_line_width as f32;
                }
            }

            if let Some(color) = background_color {
                let width = indent_guide.single_indent_width - px(line_indicator_width);
                window.paint_quad(fill(
                    window.pixel_snap_bounds(Bounds {
                        origin: point(
                            indent_guide.origin.x + px(line_indicator_width),
                            indent_guide.origin.y,
                        ),
                        size: size(width, indent_guide.length),
                    }),
                    color,
                ));
            }
        }
    }

    fn paint_line_numbers(&mut self, layout: &mut EditorLayout, window: &mut Window, cx: &mut App) {
        let is_singleton = self.editor.read(cx).buffer_kind(cx) == ItemBufferKind::Singleton;

        let line_height = layout.position_map.line_height;
        window.set_cursor_style(CursorStyle::Arrow, &layout.gutter_hitbox);

        for line_layout in layout.line_numbers.values() {
            for LineNumberSegment {
                shaped_line,
                hitbox,
            } in &line_layout.segments
            {
                let Some(hitbox) = hitbox else {
                    continue;
                };

                let Some(()) = (if !is_singleton && hitbox.is_hovered(window) {
                    let color = cx.theme().colors().editor_hover_line_number;

                    let line = self.shape_line_number(shaped_line.text.clone(), color, window);
                    line.paint(
                        hitbox.origin,
                        line_height,
                        TextAlign::Left,
                        None,
                        window,
                        cx,
                    )
                    .log_err()
                } else {
                    shaped_line
                        .paint(
                            hitbox.origin,
                            line_height,
                            TextAlign::Left,
                            None,
                            window,
                            cx,
                        )
                        .log_err()
                }) else {
                    continue;
                };

                // In singleton buffers, we select corresponding lines on the line number click, so use | -like cursor.
                // In multi buffers, we open file at the line number clicked, so use a pointing hand cursor.
                if is_singleton {
                    window.set_cursor_style(CursorStyle::IBeam, hitbox);
                } else {
                    window.set_cursor_style(CursorStyle::PointingHand, hitbox);
                }
            }
        }
    }

    fn paint_gutter_diff_hunks(
        layout: &mut EditorLayout,
        split_side: Option<SplitSide>,
        window: &mut Window,
        cx: &mut App,
    ) {
        if layout.display_hunks.is_empty() {
            return;
        }

        let line_height = layout.position_map.line_height;
        window.paint_layer(layout.gutter_hitbox.bounds, |window| {
            for (hunk, hitbox) in &layout.display_hunks {
                let hunk_to_paint = match hunk {
                    DisplayDiffHunk::Folded { .. } => {
                        let hunk_bounds = Self::diff_hunk_bounds(
                            layout.position_map.scroll_position,
                            line_height,
                            layout.gutter_hitbox.bounds,
                            hunk,
                            &layout.position_map.snapshot,
                        );
                        Some((
                            hunk_bounds,
                            cx.theme().colors().version_control_modified,
                            Corners::all(px(0.)),
                            DiffHunkStatus::modified_none(),
                        ))
                    }
                    DisplayDiffHunk::Unfolded {
                        status,
                        display_row_range,
                        ..
                    } => hitbox.as_ref().map(|hunk_hitbox| {
                        let color = match split_side {
                            Some(SplitSide::Left) => cx.theme().colors().version_control_deleted,
                            Some(SplitSide::Right) => cx.theme().colors().version_control_added,
                            None => match status.kind {
                                DiffHunkStatusKind::Added => {
                                    cx.theme().colors().version_control_added
                                }
                                DiffHunkStatusKind::Modified => {
                                    cx.theme().colors().version_control_modified
                                }
                                DiffHunkStatusKind::Deleted => {
                                    cx.theme().colors().version_control_deleted
                                }
                            },
                        };
                        match status.kind {
                            DiffHunkStatusKind::Deleted if display_row_range.is_empty() => (
                                Bounds::new(
                                    point(
                                        hunk_hitbox.origin.x - hunk_hitbox.size.width,
                                        hunk_hitbox.origin.y,
                                    ),
                                    size(hunk_hitbox.size.width * 2., hunk_hitbox.size.height),
                                ),
                                color,
                                Corners::all(1. * line_height),
                                *status,
                            ),
                            _ => (hunk_hitbox.bounds, color, Corners::all(px(0.)), *status),
                        }
                    }),
                };

                if let Some((hunk_bounds, background_color, corner_radii, status)) = hunk_to_paint {
                    // Flatten the background color with the editor color to prevent
                    // elements below transparent hunks from showing through
                    let flattened_background_color = cx
                        .theme()
                        .colors()
                        .editor_background
                        .blend(background_color);

                    if !Self::diff_hunk_hollow(status, cx) {
                        window.paint_quad(quad(
                            hunk_bounds,
                            corner_radii,
                            flattened_background_color,
                            Edges::default(),
                            transparent_black(),
                            BorderStyle::default(),
                        ));
                    } else {
                        let flattened_unstaged_background_color = cx
                            .theme()
                            .colors()
                            .editor_background
                            .blend(background_color.opacity(0.3));

                        window.paint_quad(quad(
                            hunk_bounds,
                            corner_radii,
                            flattened_unstaged_background_color,
                            Edges::all(px(1.0)),
                            flattened_background_color,
                            BorderStyle::Solid,
                        ));
                    }
                }
            }
        });
    }

    fn gutter_strip_width(line_height: Pixels) -> Pixels {
        (0.275 * line_height).floor()
    }

    fn diff_hunk_bounds(
        scroll_position: gpui::Point<ScrollOffset>,
        line_height: Pixels,
        gutter_bounds: Bounds<Pixels>,
        hunk: &DisplayDiffHunk,
        snapshot: &EditorSnapshot,
    ) -> Bounds<Pixels> {
        let scroll_top = scroll_position.y * ScrollPixelOffset::from(line_height);
        let gutter_strip_width = Self::gutter_strip_width(line_height);

        match hunk {
            DisplayDiffHunk::Folded { display_row, .. } => {
                let start_y = (display_row.as_f64() * ScrollPixelOffset::from(line_height)
                    - scroll_top)
                    .into();
                let end_y = start_y + line_height;
                let highlight_origin = gutter_bounds.origin + point(px(0.), start_y);
                let highlight_size = size(gutter_strip_width, end_y - start_y);
                Bounds::new(highlight_origin, highlight_size)
            }
            DisplayDiffHunk::Unfolded {
                display_row_range,
                status,
                ..
            } => {
                if status.is_deleted() && display_row_range.is_empty() {
                    let row = display_row_range.start;

                    let offset = ScrollPixelOffset::from(line_height / 2.);
                    let start_y =
                        (row.as_f64() * ScrollPixelOffset::from(line_height) - offset - scroll_top)
                            .into();
                    let end_y = start_y + line_height;

                    let width = (0.35 * line_height).floor();
                    let highlight_origin = gutter_bounds.origin + point(px(0.), start_y);
                    let highlight_size = size(width, end_y - start_y);
                    Bounds::new(highlight_origin, highlight_size)
                } else {
                    let start_row = display_row_range.start;
                    let end_row = display_row_range.end;
                    // If we're in a multibuffer, row range span might include an
                    // excerpt header, so if we were to draw the marker straight away,
                    // the hunk might include the rows of that header.
                    // Making the range inclusive doesn't quite cut it, as we rely on the exclusivity for the soft wrap.
                    // Instead, we simply check whether the range we're dealing with includes
                    // any excerpt headers and if so, we stop painting the diff hunk on the first row of that header.
                    let end_row_in_current_excerpt = snapshot
                        .blocks_in_range(start_row..end_row)
                        .find_map(|(start_row, block)| {
                            if matches!(
                                block,
                                Block::ExcerptBoundary { .. } | Block::BufferHeader { .. }
                            ) {
                                Some(start_row)
                            } else {
                                None
                            }
                        })
                        .unwrap_or(end_row);

                    let start_y = (start_row.as_f64() * ScrollPixelOffset::from(line_height)
                        - scroll_top)
                        .into();
                    let end_y = Pixels::from(
                        end_row_in_current_excerpt.as_f64() * ScrollPixelOffset::from(line_height)
                            - scroll_top,
                    );

                    let highlight_origin = gutter_bounds.origin + point(px(0.), start_y);
                    let highlight_size = size(gutter_strip_width, end_y - start_y);
                    Bounds::new(highlight_origin, highlight_size)
                }
            }
        }
    }

    fn paint_gutter_indicators(
        &self,
        layout: &mut EditorLayout,
        window: &mut Window,
        cx: &mut App,
    ) {
        window.paint_layer(layout.gutter_hitbox.bounds, |window| {
            window.with_element_namespace("crease_toggles", |window| {
                for crease_toggle in layout.crease_toggles.iter_mut().flatten() {
                    crease_toggle.paint(window, cx);
                }
            });

            window.with_element_namespace("expand_toggles", |window| {
                for (expand_toggle, _) in layout.expand_toggles.iter_mut().flatten() {
                    expand_toggle.paint(window, cx);
                }
            });

            for bookmark in layout.bookmarks.iter_mut() {
                bookmark.paint(window, cx);
            }

            for breakpoint in layout.breakpoints.iter_mut() {
                breakpoint.paint(window, cx);
            }

            for test_indicator in layout.test_indicators.iter_mut() {
                test_indicator.paint(window, cx);
            }

            if let Some(diff_review_button) = layout.diff_review_button.as_mut() {
                diff_review_button.paint(window, cx);
            }
        });
    }

    fn paint_gutter_highlights(
        &self,
        layout: &mut EditorLayout,
        window: &mut Window,
        cx: &mut App,
    ) {
        for (_, hunk_hitbox) in &layout.display_hunks {
            if let Some(hunk_hitbox) = hunk_hitbox
                && !self
                    .editor
                    .read(cx)
                    .buffer()
                    .read(cx)
                    .all_diff_hunks_expanded()
            {
                window.set_cursor_style(CursorStyle::PointingHand, hunk_hitbox);
            }
        }

        let show_git_gutter = layout
            .position_map
            .snapshot
            .show_git_diff_gutter
            .unwrap_or_else(|| {
                matches!(
                    ProjectSettings::get_global(cx).git.git_gutter,
                    GitGutterSetting::TrackedFiles
                )
            });
        if show_git_gutter {
            Self::paint_gutter_diff_hunks(layout, self.split_side, window, cx)
        }

        let highlight_width = 0.275 * layout.position_map.line_height;
        let highlight_corner_radii = Corners::all(0.05 * layout.position_map.line_height);
        window.paint_layer(layout.gutter_hitbox.bounds, |window| {
            for (range, color) in &layout.highlighted_gutter_ranges {
                let start_row = if range.start.row() < layout.visible_display_row_range.start {
                    layout.visible_display_row_range.start - DisplayRow(1)
                } else {
                    range.start.row()
                };
                let end_row = if range.end.row() > layout.visible_display_row_range.end {
                    layout.visible_display_row_range.end + DisplayRow(1)
                } else {
                    range.end.row()
                };

                let start_y = layout.gutter_hitbox.top()
                    + Pixels::from(
                        start_row.0 as f64
                            * ScrollPixelOffset::from(layout.position_map.line_height)
                            - layout.position_map.scroll_pixel_position.y,
                    );
                let end_y = layout.gutter_hitbox.top()
                    + Pixels::from(
                        (end_row.0 + 1) as f64
                            * ScrollPixelOffset::from(layout.position_map.line_height)
                            - layout.position_map.scroll_pixel_position.y,
                    );
                let bounds = Bounds::from_corners(
                    point(layout.gutter_hitbox.left(), start_y),
                    point(layout.gutter_hitbox.left() + highlight_width, end_y),
                );
                window.paint_quad(fill(bounds, *color).corner_radii(highlight_corner_radii));
            }
        });
    }

    fn paint_blamed_display_rows(
        &self,
        layout: &mut EditorLayout,
        window: &mut Window,
        cx: &mut App,
    ) {
        let Some(blamed_display_rows) = layout.blamed_display_rows.take() else {
            return;
        };

        window.paint_layer(layout.gutter_hitbox.bounds, |window| {
            for mut blame_element in blamed_display_rows.into_iter() {
                blame_element.paint(window, cx);
            }
        })
    }

    fn paint_text(&mut self, layout: &mut EditorLayout, window: &mut Window, cx: &mut App) {
        window.with_content_mask(
            Some(ContentMask {
                bounds: layout.position_map.text_hitbox.bounds,
            }),
            |window| {
                let editor = self.editor.read(cx);
                if let SelectionDragState::ReadyToDrag {
                    mouse_down_time, ..
                } = &editor.selection_drag_state
                {
                    let drag_and_drop_delay = Duration::from_millis(
                        EditorSettings::get_global(cx)
                            .drag_and_drop_selection
                            .delay
                            .0,
                    );
                    if mouse_down_time.elapsed() >= drag_and_drop_delay {
                        window.set_cursor_style(
                            CursorStyle::DragCopy,
                            &layout.position_map.text_hitbox,
                        );
                    }
                } else if matches!(
                    editor.selection_drag_state,
                    SelectionDragState::Dragging { .. }
                ) {
                    window
                        .set_cursor_style(CursorStyle::DragCopy, &layout.position_map.text_hitbox);
                } else if editor
                    .hovered_link_state
                    .as_ref()
                    .is_some_and(|hovered_link_state| !hovered_link_state.links.is_empty())
                {
                    window.set_cursor_style(
                        CursorStyle::PointingHand,
                        &layout.position_map.text_hitbox,
                    );
                } else {
                    window.set_cursor_style(CursorStyle::IBeam, &layout.position_map.text_hitbox);
                };

                self.paint_lines_background(layout, window, cx);
                let invisible_display_ranges = self.paint_highlights(layout, window, cx);
                self.paint_document_colors(layout, window);
                self.paint_lines(&invisible_display_ranges, layout, window, cx);
                self.paint_redactions(layout, window);
                self.paint_navigation_overlays(layout, window, cx);
                self.paint_cursors(layout, window, cx);
                self.paint_inline_diagnostics(layout, window, cx);
                self.paint_inline_blame(layout, window, cx);
                self.paint_inline_code_actions(layout, window, cx);
                self.paint_diff_hunk_controls(layout, window, cx);
                window.with_element_namespace("crease_trailers", |window| {
                    for trailer in layout.crease_trailers.iter_mut().flatten() {
                        trailer.element.paint(window, cx);
                    }
                });
            },
        )
    }

    fn paint_highlights(
        &mut self,
        layout: &mut EditorLayout,
        window: &mut Window,
        cx: &mut App,
    ) -> SmallVec<[Range<DisplayPoint>; 32]> {
        window.paint_layer(layout.position_map.text_hitbox.bounds, |window| {
            let mut invisible_display_ranges = SmallVec::<[Range<DisplayPoint>; 32]>::new();
            let line_end_overshoot = 0.15 * layout.position_map.line_height;
            for (range, color) in &layout.highlighted_ranges {
                self.paint_highlighted_range(
                    range.clone(),
                    true,
                    *color,
                    Pixels::ZERO,
                    line_end_overshoot,
                    layout,
                    window,
                );
            }

            let corner_radius = if EditorSettings::get_global(cx).rounded_selection {
                0.15 * layout.position_map.line_height
            } else {
                Pixels::ZERO
            };

            for (player_color, selections) in &layout.selections {
                for selection in selections.iter() {
                    self.paint_highlighted_range(
                        selection.range.clone(),
                        true,
                        player_color.selection,
                        corner_radius,
                        corner_radius * 2.,
                        layout,
                        window,
                    );

                    if selection.is_local && !selection.range.is_empty() {
                        invisible_display_ranges.push(selection.range.clone());
                    }
                }
            }
            invisible_display_ranges
        })
    }

    fn paint_lines(
        &mut self,
        invisible_display_ranges: &[Range<DisplayPoint>],
        layout: &mut EditorLayout,
        window: &mut Window,
        cx: &mut App,
    ) {
        let whitespace_setting = self
            .editor
            .read(cx)
            .buffer
            .read(cx)
            .language_settings(cx)
            .show_whitespaces;

        for (ix, line_with_invisibles) in layout.position_map.line_layouts.iter().enumerate() {
            let row = DisplayRow(layout.visible_display_row_range.start.0 + ix as u32);
            line_with_invisibles.draw(
                layout,
                row,
                layout.content_origin,
                whitespace_setting,
                invisible_display_ranges,
                window,
                cx,
            )
        }

        for line_element in &mut layout.line_elements {
            line_element.paint(window, cx);
        }
    }

    fn paint_lines_background(
        &mut self,
        layout: &mut EditorLayout,
        window: &mut Window,
        cx: &mut App,
    ) {
        for (ix, line_with_invisibles) in layout.position_map.line_layouts.iter().enumerate() {
            let row = DisplayRow(layout.visible_display_row_range.start.0 + ix as u32);
            line_with_invisibles.draw_background(layout, row, layout.content_origin, window, cx);
        }
    }

    fn paint_redactions(&mut self, layout: &EditorLayout, window: &mut Window) {
        if layout.redacted_ranges.is_empty() {
            return;
        }

        let line_end_overshoot = layout.line_end_overshoot();

        // A softer than perfect black
        let redaction_color = gpui::rgb(0x0e1111);

        window.paint_layer(layout.position_map.text_hitbox.bounds, |window| {
            for range in layout.redacted_ranges.iter() {
                self.paint_highlighted_range(
                    range.clone(),
                    true,
                    redaction_color.into(),
                    Pixels::ZERO,
                    line_end_overshoot,
                    layout,
                    window,
                );
            }
        });
    }

    fn paint_navigation_overlays(
        &mut self,
        layout: &mut EditorLayout,
        window: &mut Window,
        cx: &mut App,
    ) {
        window.with_element_namespace("navigation_overlays", |window| {
            for command in &mut layout.navigation_overlay_paint_commands {
                let NavigationOverlayPaintCommand::Label(label) = command;
                label.element.paint(window, cx);
            }
        });
    }

    fn paint_document_colors(&self, layout: &mut EditorLayout, window: &mut Window) {
        let Some((colors_render_mode, image_colors)) = &layout.document_colors else {
            return;
        };
        if image_colors.is_empty()
            || colors_render_mode == &DocumentColorsRenderMode::None
            || colors_render_mode == &DocumentColorsRenderMode::Inlay
        {
            return;
        }

        let line_end_overshoot = layout.line_end_overshoot();

        for (range, color) in image_colors {
            match colors_render_mode {
                DocumentColorsRenderMode::Inlay | DocumentColorsRenderMode::None => return,
                DocumentColorsRenderMode::Background => {
                    self.paint_highlighted_range(
                        range.clone(),
                        true,
                        *color,
                        Pixels::ZERO,
                        line_end_overshoot,
                        layout,
                        window,
                    );
                }
                DocumentColorsRenderMode::Border => {
                    self.paint_highlighted_range(
                        range.clone(),
                        false,
                        *color,
                        Pixels::ZERO,
                        line_end_overshoot,
                        layout,
                        window,
                    );
                }
            }
        }
    }

    fn paint_cursors(&mut self, layout: &mut EditorLayout, window: &mut Window, cx: &mut App) {
        for cursor in &mut layout.visible_cursors {
            cursor.paint(layout.content_origin, window, cx);
        }
    }

    fn paint_scrollbars(&mut self, layout: &mut EditorLayout, window: &mut Window, cx: &mut App) {
        let Some(scrollbars_layout) = layout.scrollbars_layout.take() else {
            return;
        };
        let any_scrollbar_dragged = self.editor.read(cx).scroll_manager.any_scrollbar_dragged();

        for (scrollbar_layout, axis) in scrollbars_layout.iter_scrollbars() {
            let hitbox = &scrollbar_layout.hitbox;
            if scrollbars_layout.visible {
                let scrollbar_edges = match axis {
                    ScrollbarAxis::Horizontal => Edges {
                        top: Pixels::ZERO,
                        right: Pixels::ZERO,
                        bottom: Pixels::ZERO,
                        left: Pixels::ZERO,
                    },
                    ScrollbarAxis::Vertical => Edges {
                        top: Pixels::ZERO,
                        right: Pixels::ZERO,
                        bottom: Pixels::ZERO,
                        left: ScrollbarLayout::BORDER_WIDTH,
                    },
                };

                window.paint_layer(hitbox.bounds, |window| {
                    window.paint_quad(quad(
                        hitbox.bounds,
                        Corners::default(),
                        cx.theme().colors().scrollbar_track_background,
                        scrollbar_edges,
                        cx.theme().colors().scrollbar_track_border,
                        BorderStyle::Solid,
                    ));

                    if axis == ScrollbarAxis::Vertical {
                        let fast_markers =
                            self.collect_fast_scrollbar_markers(layout, scrollbar_layout, cx);
                        // Refresh slow scrollbar markers in the background. Below, we
                        // paint whatever markers have already been computed.
                        self.refresh_slow_scrollbar_markers(layout, scrollbar_layout, window, cx);

                        let markers = self.editor.read(cx).scrollbar_marker_state.markers.clone();
                        for marker in markers.iter().chain(&fast_markers) {
                            let mut marker = marker.clone();
                            marker.bounds.origin += hitbox.origin;
                            window.paint_quad(marker);
                        }
                    }

                    if let Some(thumb_bounds) = scrollbar_layout.thumb_bounds {
                        let scrollbar_thumb_color = match scrollbar_layout.thumb_state {
                            ScrollbarThumbState::Dragging => {
                                cx.theme().colors().scrollbar_thumb_active_background
                            }
                            ScrollbarThumbState::Hovered => {
                                cx.theme().colors().scrollbar_thumb_hover_background
                            }
                            ScrollbarThumbState::Idle => {
                                cx.theme().colors().scrollbar_thumb_background
                            }
                        };
                        window.paint_quad(quad(
                            thumb_bounds,
                            Corners::default(),
                            scrollbar_thumb_color,
                            scrollbar_edges,
                            cx.theme().colors().scrollbar_thumb_border,
                            BorderStyle::Solid,
                        ));

                        if any_scrollbar_dragged {
                            window.set_window_cursor_style(CursorStyle::Arrow);
                        } else {
                            window.set_cursor_style(CursorStyle::Arrow, hitbox);
                        }
                    }
                })
            }
        }

        window.on_mouse_event({
            let editor = self.editor.clone();
            let scrollbars_layout = scrollbars_layout.clone();

            let mut mouse_position = window.mouse_position();
            move |event: &MouseMoveEvent, phase, window, cx| {
                if phase == DispatchPhase::Capture {
                    return;
                }

                editor.update(cx, |editor, cx| {
                    if let Some((scrollbar_layout, axis)) = event
                        .pressed_button
                        .filter(|button| *button == MouseButton::Left)
                        .and(editor.scroll_manager.dragging_scrollbar_axis())
                        .and_then(|axis| {
                            scrollbars_layout
                                .iter_scrollbars()
                                .find(|(_, a)| *a == axis)
                        })
                    {
                        let ScrollbarLayout {
                            hitbox,
                            text_unit_size,
                            ..
                        } = scrollbar_layout;

                        let old_position = mouse_position.along(axis);
                        let new_position = event.position.along(axis);
                        if (hitbox.origin.along(axis)..hitbox.bottom_right().along(axis))
                            .contains(&old_position)
                        {
                            let position = editor.scroll_position(cx).apply_along(axis, |p| {
                                (p + ScrollOffset::from(
                                    (new_position - old_position) / *text_unit_size,
                                ))
                                .max(0.)
                            });
                            editor.set_scroll_position(position, window, cx);
                        }

                        editor.scroll_manager.show_scrollbars(window, cx);
                        cx.stop_propagation();
                    } else if let Some((layout, axis)) = scrollbars_layout
                        .get_hovered_axis(window)
                        .filter(|_| !event.dragging())
                    {
                        if layout.thumb_hovered(&event.position) {
                            editor
                                .scroll_manager
                                .set_hovered_scroll_thumb_axis(axis, cx);
                        } else {
                            editor.scroll_manager.reset_scrollbar_state(cx);
                        }

                        editor.scroll_manager.show_scrollbars(window, cx);
                    } else {
                        editor.scroll_manager.reset_scrollbar_state(cx);
                    }

                    mouse_position = event.position;
                })
            }
        });

        if any_scrollbar_dragged {
            window.on_mouse_event({
                let editor = self.editor.clone();
                move |_: &MouseUpEvent, phase, window, cx| {
                    if phase == DispatchPhase::Capture {
                        return;
                    }

                    editor.update(cx, |editor, cx| {
                        if let Some((_, axis)) = scrollbars_layout.get_hovered_axis(window) {
                            editor
                                .scroll_manager
                                .set_hovered_scroll_thumb_axis(axis, cx);
                        } else {
                            editor.scroll_manager.reset_scrollbar_state(cx);
                        }
                        cx.stop_propagation();
                    });
                }
            });
        } else {
            window.on_mouse_event({
                let editor = self.editor.clone();

                move |event: &MouseDownEvent, phase, window, cx| {
                    if phase == DispatchPhase::Capture {
                        return;
                    }
                    let Some((scrollbar_layout, axis)) = scrollbars_layout.get_hovered_axis(window)
                    else {
                        return;
                    };

                    let ScrollbarLayout {
                        hitbox,
                        visible_range,
                        text_unit_size,
                        thumb_bounds,
                        ..
                    } = scrollbar_layout;

                    let Some(thumb_bounds) = thumb_bounds else {
                        return;
                    };

                    editor.update(cx, |editor, cx| {
                        editor
                            .scroll_manager
                            .set_dragged_scroll_thumb_axis(axis, cx);

                        let event_position = event.position.along(axis);

                        if event_position < thumb_bounds.origin.along(axis)
                            || thumb_bounds.bottom_right().along(axis) < event_position
                        {
                            let center_position = ((event_position - hitbox.origin.along(axis))
                                / *text_unit_size)
                                .round() as u32;
                            let start_position = center_position.saturating_sub(
                                (visible_range.end - visible_range.start) as u32 / 2,
                            );

                            let position = editor
                                .scroll_position(cx)
                                .apply_along(axis, |_| start_position as ScrollOffset);

                            editor.set_scroll_position(position, window, cx);
                        } else {
                            editor.scroll_manager.show_scrollbars(window, cx);
                        }

                        cx.stop_propagation();
                    });
                }
            });
        }
    }

    fn collect_fast_scrollbar_markers(
        &self,
        layout: &EditorLayout,
        scrollbar_layout: &ScrollbarLayout,
        cx: &mut App,
    ) -> Vec<PaintQuad> {
        const LIMIT: usize = 100;
        if !EditorSettings::get_global(cx).scrollbar.cursors || layout.cursors.len() > LIMIT {
            return vec![];
        }
        let cursor_ranges = layout
            .cursors
            .iter()
            .map(|(point, color)| ColoredRange {
                start: point.row(),
                end: point.row(),
                color: *color,
            })
            .collect_vec();
        scrollbar_layout.marker_quads_for_ranges(cursor_ranges, None)
    }

    fn refresh_slow_scrollbar_markers(
        &self,
        layout: &EditorLayout,
        scrollbar_layout: &ScrollbarLayout,
        window: &mut Window,
        cx: &mut App,
    ) {
        self.editor.update(cx, |editor, cx| {
            if editor.buffer_kind(cx) != ItemBufferKind::Singleton
                || !editor
                    .scrollbar_marker_state
                    .should_refresh(scrollbar_layout.hitbox.size)
            {
                return;
            }

            let scrollbar_layout = scrollbar_layout.clone();
            let background_highlights = editor.background_highlights.clone();
            let snapshot = layout.position_map.snapshot.clone();
            let theme = cx.theme().clone();
            let scrollbar_settings = EditorSettings::get_global(cx).scrollbar;

            editor.scrollbar_marker_state.dirty = false;
            editor.scrollbar_marker_state.pending_refresh =
                Some(cx.spawn_in(window, async move |editor, cx| {
                    let scrollbar_size = scrollbar_layout.hitbox.size;
                    let scrollbar_markers = cx
                        .background_spawn(async move {
                            let max_point = snapshot.display_snapshot.buffer_snapshot().max_point();
                            let mut marker_quads = Vec::new();
                            if scrollbar_settings.git_diff {
                                let marker_row_ranges =
                                    snapshot.buffer_snapshot().diff_hunks().map(|hunk| {
                                        let start_display_row =
                                            MultiBufferPoint::new(hunk.row_range.start.0, 0)
                                                .to_display_point(&snapshot.display_snapshot)
                                                .row();
                                        let mut end_display_row =
                                            MultiBufferPoint::new(hunk.row_range.end.0, 0)
                                                .to_display_point(&snapshot.display_snapshot)
                                                .row();
                                        if end_display_row != start_display_row {
                                            end_display_row.0 -= 1;
                                        }
                                        let color = match &hunk.status().kind {
                                            DiffHunkStatusKind::Added => {
                                                theme.colors().version_control_added
                                            }
                                            DiffHunkStatusKind::Modified => {
                                                theme.colors().version_control_modified
                                            }
                                            DiffHunkStatusKind::Deleted => {
                                                theme.colors().version_control_deleted
                                            }
                                        };
                                        ColoredRange {
                                            start: start_display_row,
                                            end: end_display_row,
                                            color,
                                        }
                                    });

                                marker_quads.extend(
                                    scrollbar_layout
                                        .marker_quads_for_ranges(marker_row_ranges, Some(0)),
                                );
                            }

                            for (background_highlight_id, (_, background_ranges)) in
                                background_highlights.iter()
                            {
                                let is_search_highlights = *background_highlight_id
                                    == HighlightKey::BufferSearchHighlights;
                                let is_text_highlights =
                                    *background_highlight_id == HighlightKey::SelectedTextHighlight;
                                let is_symbol_occurrences = *background_highlight_id
                                    == HighlightKey::DocumentHighlightRead
                                    || *background_highlight_id
                                        == HighlightKey::DocumentHighlightWrite;
                                if (is_search_highlights && scrollbar_settings.search_results)
                                    || (is_text_highlights && scrollbar_settings.selected_text)
                                    || (is_symbol_occurrences && scrollbar_settings.selected_symbol)
                                {
                                    let mut color = theme.status().info;
                                    if is_symbol_occurrences {
                                        color.fade_out(0.5);
                                    }
                                    let marker_row_ranges = background_ranges.iter().map(|range| {
                                        let display_start = range
                                            .start
                                            .to_display_point(&snapshot.display_snapshot);
                                        let display_end =
                                            range.end.to_display_point(&snapshot.display_snapshot);
                                        ColoredRange {
                                            start: display_start.row(),
                                            end: display_end.row(),
                                            color,
                                        }
                                    });
                                    marker_quads.extend(
                                        scrollbar_layout
                                            .marker_quads_for_ranges(marker_row_ranges, Some(1)),
                                    );
                                }
                            }

                            if scrollbar_settings.diagnostics != ScrollbarDiagnostics::None {
                                let diagnostics = snapshot
                                    .buffer_snapshot()
                                    .diagnostics_in_range::<Point>(Point::zero()..max_point)
                                    // Don't show diagnostics the user doesn't care about
                                    .filter(|diagnostic| {
                                        match (
                                            scrollbar_settings.diagnostics,
                                            diagnostic.diagnostic.severity,
                                        ) {
                                            (ScrollbarDiagnostics::All, _) => true,
                                            (
                                                ScrollbarDiagnostics::Error,
                                                lsp::DiagnosticSeverity::ERROR,
                                            ) => true,
                                            (
                                                ScrollbarDiagnostics::Warning,
                                                lsp::DiagnosticSeverity::ERROR
                                                | lsp::DiagnosticSeverity::WARNING,
                                            ) => true,
                                            (
                                                ScrollbarDiagnostics::Information,
                                                lsp::DiagnosticSeverity::ERROR
                                                | lsp::DiagnosticSeverity::WARNING
                                                | lsp::DiagnosticSeverity::INFORMATION,
                                            ) => true,
                                            (_, _) => false,
                                        }
                                    })
                                    // We want to sort by severity, in order to paint the most severe diagnostics last.
                                    .sorted_by_key(|diagnostic| {
                                        std::cmp::Reverse(diagnostic.diagnostic.severity)
                                    });

                                let marker_row_ranges = diagnostics.into_iter().map(|diagnostic| {
                                    let start_display = diagnostic
                                        .range
                                        .start
                                        .to_display_point(&snapshot.display_snapshot);
                                    let end_display = diagnostic
                                        .range
                                        .end
                                        .to_display_point(&snapshot.display_snapshot);
                                    let color = match diagnostic.diagnostic.severity {
                                        lsp::DiagnosticSeverity::ERROR => theme.status().error,
                                        lsp::DiagnosticSeverity::WARNING => theme.status().warning,
                                        lsp::DiagnosticSeverity::INFORMATION => theme.status().info,
                                        _ => theme.status().hint,
                                    };
                                    ColoredRange {
                                        start: start_display.row(),
                                        end: end_display.row(),
                                        color,
                                    }
                                });
                                marker_quads.extend(
                                    scrollbar_layout
                                        .marker_quads_for_ranges(marker_row_ranges, Some(2)),
                                );
                            }

                            Arc::from(marker_quads)
                        })
                        .await;

                    editor.update(cx, |editor, cx| {
                        editor.scrollbar_marker_state.markers = scrollbar_markers;
                        editor.scrollbar_marker_state.scrollbar_size = scrollbar_size;
                        editor.scrollbar_marker_state.pending_refresh = None;
                        cx.notify();
                    })?;

                    Ok(())
                }));
        });
    }

    fn paint_highlighted_range(
        &self,
        range: Range<DisplayPoint>,
        fill: bool,
        color: Hsla,
        corner_radius: Pixels,
        line_end_overshoot: Pixels,
        layout: &EditorLayout,
        window: &mut Window,
    ) {
        let start_row = layout.visible_display_row_range.start;
        let end_row = layout.visible_display_row_range.end;
        if range.start != range.end {
            let row_range = if range.end.column() == 0 {
                cmp::max(range.start.row(), start_row)..cmp::min(range.end.row(), end_row)
            } else {
                cmp::max(range.start.row(), start_row)
                    ..cmp::min(range.end.row().next_row(), end_row)
            };

            let highlighted_range = HighlightedRange {
                color,
                line_height: layout.position_map.line_height,
                corner_radius,
                start_y: layout.content_origin.y
                    + Pixels::from(
                        (row_range.start.as_f64() - layout.position_map.scroll_position.y)
                            * ScrollOffset::from(layout.position_map.line_height),
                    ),
                lines: row_range
                    .iter_rows()
                    .map(|row| {
                        let line_layout =
                            &layout.position_map.line_layouts[row.minus(start_row) as usize];
                        let alignment_offset =
                            line_layout.alignment_offset(layout.text_align, layout.content_width);
                        HighlightedRangeLine {
                            start_x: if row == range.start.row() {
                                layout.content_origin.x
                                    + Pixels::from(
                                        ScrollPixelOffset::from(
                                            line_layout.x_for_index(range.start.column() as usize)
                                                + alignment_offset,
                                        ) - layout.position_map.scroll_pixel_position.x,
                                    )
                            } else {
                                layout.content_origin.x + alignment_offset
                                    - Pixels::from(layout.position_map.scroll_pixel_position.x)
                            },
                            end_x: if row == range.end.row() {
                                layout.content_origin.x
                                    + Pixels::from(
                                        ScrollPixelOffset::from(
                                            line_layout.x_for_index(range.end.column() as usize)
                                                + alignment_offset,
                                        ) - layout.position_map.scroll_pixel_position.x,
                                    )
                            } else {
                                Pixels::from(
                                    ScrollPixelOffset::from(
                                        layout.content_origin.x
                                            + line_layout.width
                                            + alignment_offset
                                            + line_end_overshoot,
                                    ) - layout.position_map.scroll_pixel_position.x,
                                )
                            },
                        }
                    })
                    .collect(),
            };

            highlighted_range.paint(fill, layout.position_map.text_hitbox.bounds, window);
        }
    }

    fn paint_inline_diagnostics(
        &mut self,
        layout: &mut EditorLayout,
        window: &mut Window,
        cx: &mut App,
    ) {
        for mut inline_diagnostic in layout.inline_diagnostics.drain() {
            inline_diagnostic.1.paint(window, cx);
        }
    }

    fn paint_inline_blame(&mut self, layout: &mut EditorLayout, window: &mut Window, cx: &mut App) {
        if let Some(mut blame_layout) = layout.inline_blame_layout.take() {
            window.paint_layer(layout.position_map.text_hitbox.bounds, |window| {
                blame_layout.element.paint(window, cx);
            })
        }
    }

    fn paint_inline_code_actions(
        &mut self,
        layout: &mut EditorLayout,
        window: &mut Window,
        cx: &mut App,
    ) {
        if let Some(mut inline_code_actions) = layout.inline_code_actions.take() {
            window.paint_layer(layout.position_map.text_hitbox.bounds, |window| {
                inline_code_actions.paint(window, cx);
            })
        }
    }

    fn paint_diff_hunk_controls(
        &mut self,
        layout: &mut EditorLayout,
        window: &mut Window,
        cx: &mut App,
    ) {
        for mut diff_hunk_control in layout.diff_hunk_controls.drain(..) {
            diff_hunk_control.paint(window, cx);
        }
    }

    fn paint_minimap(&self, layout: &mut EditorLayout, window: &mut Window, cx: &mut App) {
        if let Some(mut layout) = layout.minimap.take() {
            let minimap_hitbox = layout.thumb_layout.hitbox.clone();
            let dragging_minimap = self.editor.read(cx).scroll_manager.is_dragging_minimap();

            window.paint_layer(layout.thumb_layout.hitbox.bounds, |window| {
                window.with_element_namespace("minimap", |window| {
                    layout.minimap.paint(window, cx);
                    if let Some(thumb_bounds) = layout.thumb_layout.thumb_bounds {
                        let minimap_thumb_color = match layout.thumb_layout.thumb_state {
                            ScrollbarThumbState::Idle => {
                                cx.theme().colors().minimap_thumb_background
                            }
                            ScrollbarThumbState::Hovered => {
                                cx.theme().colors().minimap_thumb_hover_background
                            }
                            ScrollbarThumbState::Dragging => {
                                cx.theme().colors().minimap_thumb_active_background
                            }
                        };
                        let minimap_thumb_border = match layout.thumb_border_style {
                            MinimapThumbBorder::Full => Edges::all(ScrollbarLayout::BORDER_WIDTH),
                            MinimapThumbBorder::LeftOnly => Edges {
                                left: ScrollbarLayout::BORDER_WIDTH,
                                ..Default::default()
                            },
                            MinimapThumbBorder::LeftOpen => Edges {
                                right: ScrollbarLayout::BORDER_WIDTH,
                                top: ScrollbarLayout::BORDER_WIDTH,
                                bottom: ScrollbarLayout::BORDER_WIDTH,
                                ..Default::default()
                            },
                            MinimapThumbBorder::RightOpen => Edges {
                                left: ScrollbarLayout::BORDER_WIDTH,
                                top: ScrollbarLayout::BORDER_WIDTH,
                                bottom: ScrollbarLayout::BORDER_WIDTH,
                                ..Default::default()
                            },
                            MinimapThumbBorder::None => Default::default(),
                        };

                        window.paint_layer(minimap_hitbox.bounds, |window| {
                            window.paint_quad(quad(
                                thumb_bounds,
                                Corners::default(),
                                minimap_thumb_color,
                                minimap_thumb_border,
                                cx.theme().colors().minimap_thumb_border,
                                BorderStyle::Solid,
                            ));
                        });
                    }
                });
            });

            if dragging_minimap {
                window.set_window_cursor_style(CursorStyle::Arrow);
            } else {
                window.set_cursor_style(CursorStyle::Arrow, &minimap_hitbox);
            }

            let minimap_axis = ScrollbarAxis::Vertical;
            let pixels_per_line = Pixels::from(
                ScrollPixelOffset::from(minimap_hitbox.size.height) / layout.max_scroll_top,
            )
            .min(layout.minimap_line_height);

            let mut mouse_position = window.mouse_position();

            window.on_mouse_event({
                let editor = self.editor.clone();

                let minimap_hitbox = minimap_hitbox.clone();

                move |event: &MouseMoveEvent, phase, window, cx| {
                    if phase == DispatchPhase::Capture {
                        return;
                    }

                    editor.update(cx, |editor, cx| {
                        if event.pressed_button == Some(MouseButton::Left)
                            && editor.scroll_manager.is_dragging_minimap()
                        {
                            let old_position = mouse_position.along(minimap_axis);
                            let new_position = event.position.along(minimap_axis);
                            if (minimap_hitbox.origin.along(minimap_axis)
                                ..minimap_hitbox.bottom_right().along(minimap_axis))
                                .contains(&old_position)
                            {
                                let position =
                                    editor.scroll_position(cx).apply_along(minimap_axis, |p| {
                                        (p + ScrollPixelOffset::from(
                                            (new_position - old_position) / pixels_per_line,
                                        ))
                                        .max(0.)
                                    });

                                editor.set_scroll_position(position, window, cx);
                            }
                            cx.stop_propagation();
                        } else if minimap_hitbox.is_hovered(window) {
                            editor.scroll_manager.set_is_hovering_minimap_thumb(
                                !event.dragging()
                                    && layout
                                        .thumb_layout
                                        .thumb_bounds
                                        .is_some_and(|bounds| bounds.contains(&event.position)),
                                cx,
                            );

                            // Stop hover events from propagating to the
                            // underlying editor if the minimap hitbox is hovered
                            if !event.dragging() {
                                cx.stop_propagation();
                            }
                        } else {
                            editor.scroll_manager.hide_minimap_thumb(cx);
                        }
                        mouse_position = event.position;
                    });
                }
            });

            if dragging_minimap {
                window.on_mouse_event({
                    let editor = self.editor.clone();
                    move |event: &MouseUpEvent, phase, window, cx| {
                        if phase == DispatchPhase::Capture {
                            return;
                        }

                        editor.update(cx, |editor, cx| {
                            if minimap_hitbox.is_hovered(window) {
                                editor.scroll_manager.set_is_hovering_minimap_thumb(
                                    layout
                                        .thumb_layout
                                        .thumb_bounds
                                        .is_some_and(|bounds| bounds.contains(&event.position)),
                                    cx,
                                );
                            } else {
                                editor.scroll_manager.hide_minimap_thumb(cx);
                            }
                            cx.stop_propagation();
                        });
                    }
                });
            } else {
                window.on_mouse_event({
                    let editor = self.editor.clone();

                    move |event: &MouseDownEvent, phase, window, cx| {
                        if phase == DispatchPhase::Capture || !minimap_hitbox.is_hovered(window) {
                            return;
                        }

                        let event_position = event.position;

                        let Some(thumb_bounds) = layout.thumb_layout.thumb_bounds else {
                            return;
                        };

                        editor.update(cx, |editor, cx| {
                            if !thumb_bounds.contains(&event_position) {
                                let click_position =
                                    event_position.relative_to(&minimap_hitbox.origin).y;

                                let top_position = (click_position
                                    - thumb_bounds.size.along(minimap_axis) / 2.0)
                                    .max(Pixels::ZERO);

                                let scroll_offset = (layout.minimap_scroll_top
                                    + ScrollPixelOffset::from(
                                        top_position / layout.minimap_line_height,
                                    ))
                                .min(layout.max_scroll_top);

                                let scroll_position = editor
                                    .scroll_position(cx)
                                    .apply_along(minimap_axis, |_| scroll_offset);
                                editor.set_scroll_position(scroll_position, window, cx);
                            }

                            editor.scroll_manager.set_is_dragging_minimap(cx);
                            cx.stop_propagation();
                        });
                    }
                });
            }
        }
    }

    fn paint_spacer_blocks(
        &mut self,
        layout: &mut EditorLayout,
        window: &mut Window,
        cx: &mut App,
    ) {
        for mut block in layout.spacer_blocks.drain(..) {
            let mut bounds = layout.hitbox.bounds;
            bounds.origin.x += layout.gutter_hitbox.bounds.size.width;
            window.with_content_mask(Some(ContentMask { bounds }), |window| {
                block.element.paint(window, cx);
            })
        }
    }

    fn paint_non_spacer_blocks(
        &mut self,
        layout: &mut EditorLayout,
        window: &mut Window,
        cx: &mut App,
    ) {
        for mut block in layout.blocks.drain(..) {
            if block.overlaps_gutter {
                block.element.paint(window, cx);
            } else {
                let mut bounds = layout.hitbox.bounds;
                bounds.origin.x += layout.gutter_hitbox.bounds.size.width;
                window.with_content_mask(Some(ContentMask { bounds }), |window| {
                    block.element.paint(window, cx);
                })
            }
        }
    }

    fn paint_edit_prediction_popover(
        &mut self,
        layout: &mut EditorLayout,
        window: &mut Window,
        cx: &mut App,
    ) {
        if let Some(edit_prediction_popover) = layout.edit_prediction_popover.as_mut() {
            edit_prediction_popover.paint(window, cx);
        }
    }

    fn paint_mouse_context_menu(
        &mut self,
        layout: &mut EditorLayout,
        window: &mut Window,
        cx: &mut App,
    ) {
        if let Some(mouse_context_menu) = layout.mouse_context_menu.as_mut() {
            mouse_context_menu.paint(window, cx);
        }
    }

    fn shape_line_number(
        &self,
        text: SharedString,
        color: Hsla,
        window: &mut Window,
    ) -> ShapedLine {
        let run = TextRun {
            len: text.len(),
            font: self.style.text.font(),
            color,
            ..Default::default()
        };
        window.text_system().shape_line(
            text,
            self.style.text.font_size.to_pixels(window.rem_size()),
            &[run],
            None,
        )
    }

    fn diff_hunk_hollow(status: DiffHunkStatus, cx: &mut App) -> bool {
        let unstaged = status.has_secondary_hunk();
        let unstaged_hollow = matches!(
            ProjectSettings::get_global(cx).git.hunk_style,
            GitHunkStyleSetting::UnstagedHollow
        );

        unstaged == unstaged_hollow
    }

    #[cfg(debug_assertions)]
    fn layout_debug_ranges(
        selections: &mut Vec<(PlayerColor, Vec<SelectionLayout>)>,
        anchor_range: Range<Anchor>,
        display_snapshot: &DisplaySnapshot,
        cx: &App,
    ) {
        let theme = cx.theme();
        text::debug::GlobalDebugRanges::with_locked(|debug_ranges| {
            if debug_ranges.ranges.is_empty() {
                return;
            }
            let buffer_snapshot = &display_snapshot.buffer_snapshot();
            for (excerpt_buffer_snapshot, buffer_range, _) in
                buffer_snapshot.range_to_buffer_ranges(anchor_range.start..anchor_range.end)
            {
                let buffer_range = excerpt_buffer_snapshot.anchor_after(buffer_range.start)
                    ..excerpt_buffer_snapshot.anchor_before(buffer_range.end);
                selections.extend(debug_ranges.ranges.iter().flat_map(|debug_range| {
                    debug_range.ranges.iter().filter_map(|range| {
                        let player_color = theme
                            .players()
                            .color_for_participant(debug_range.occurrence_index as u32 + 1);
                        if range.start.buffer_id != excerpt_buffer_snapshot.remote_id() {
                            return None;
                        }
                        let clipped_start = range
                            .start
                            .max(&buffer_range.start, &excerpt_buffer_snapshot);
                        let clipped_end =
                            range.end.min(&buffer_range.end, &excerpt_buffer_snapshot);
                        let range = buffer_snapshot
                            .buffer_anchor_range_to_anchor_range(*clipped_start..*clipped_end)?;
                        let start = range.start.to_display_point(display_snapshot);
                        let end = range.end.to_display_point(display_snapshot);
                        let selection_layout = SelectionLayout {
                            head: start,
                            range: start..end,
                            cursor_shape: CursorShape::Bar,
                            is_newest: false,
                            is_local: false,
                            active_rows: start.row()..end.row(),
                            user_name: Some(SharedString::new(debug_range.value.clone())),
                        };
                        Some((player_color, vec![selection_layout]))
                    })
                }));
            }
        });
    }
}

struct Gutter<'a> {
    line_height: Pixels,
    range: Range<DisplayRow>,
    scroll_position: gpui::Point<ScrollOffset>,
    dimensions: &'a GutterDimensions,
    hitbox: &'a Hitbox,
    snapshot: &'a EditorSnapshot,
    row_infos: &'a [RowInfo],
}

impl Gutter<'_> {
    fn layout_item_skipping_folds(
        &self,
        display_row: DisplayRow,
        render_item: impl Fn(&mut Context<'_, Editor>, &mut Window) -> AnyElement,
        window: &mut Window,
        cx: &mut Context<'_, Editor>,
    ) -> Option<AnyElement> {
        let row = MultiBufferRow(
            DisplayPoint::new(display_row, 0)
                .to_point(self.snapshot)
                .row,
        );
        if self.snapshot.is_line_folded(row) {
            return None;
        }

        self.layout_item(display_row, render_item, window, cx)
    }

    fn layout_item(
        &self,
        display_row: DisplayRow,
        render_item: impl Fn(&mut Context<'_, Editor>, &mut Window) -> AnyElement,
        window: &mut Window,
        cx: &mut Context<'_, Editor>,
    ) -> Option<AnyElement> {
        if !self.range.contains(&display_row) {
            return None;
        }

        if self
            .row_infos
            .get((display_row.0.saturating_sub(self.range.start.0)) as usize)
            .is_some_and(|row_info| {
                row_info.expand_info.is_some()
                    || row_info
                        .diff_status
                        .is_some_and(|status| status.is_deleted())
            })
        {
            return None;
        }

        let button = self.prepaint_button(render_item(cx, window), display_row, window, cx);
        Some(button)
    }

    fn prepaint_button(
        &self,
        mut button: AnyElement,
        row: DisplayRow,
        window: &mut Window,
        cx: &mut App,
    ) -> AnyElement {
        let available_space = size(
            AvailableSpace::MinContent,
            AvailableSpace::Definite(self.line_height),
        );
        let indicator_size = button.layout_as_root(available_space, window, cx);
        let git_gutter_width = EditorElement::gutter_strip_width(self.line_height)
            + self.dimensions.git_blame_entries_width.unwrap_or_default();

        let x = git_gutter_width + px(2.);

        let mut y = Pixels::from(
            (row.as_f64() - self.scroll_position.y) * ScrollPixelOffset::from(self.line_height),
        );
        y += (self.line_height - indicator_size.height) / 2.;

        button.prepaint_as_root(
            self.hitbox.origin + point(x, y),
            available_space,
            window,
            cx,
        );
        button
    }
}

pub fn render_breadcrumb_text(
    mut segments: Vec<HighlightedText>,
    breadcrumb_font: Option<Font>,
    prefix: Option<gpui::AnyElement>,
    active_item: &dyn ItemHandle,
    multibuffer_header: bool,
    window: &mut Window,
    cx: &App,
) -> gpui::AnyElement {
    const MAX_SEGMENTS: usize = 12;

    let element = h_flex().flex_grow().text_ui(cx);

    let prefix_end_ix = cmp::min(segments.len(), MAX_SEGMENTS / 2);
    let suffix_start_ix = cmp::max(
        prefix_end_ix,
        segments.len().saturating_sub(MAX_SEGMENTS / 2),
    );

    if suffix_start_ix > prefix_end_ix {
        segments.splice(
            prefix_end_ix..suffix_start_ix,
            Some(HighlightedText {
                text: "⋯".into(),
                highlights: vec![],
            }),
        );
    }

    let highlighted_segments = segments.into_iter().enumerate().map(|(index, segment)| {
        let mut text_style = window.text_style();
        if let Some(font) = &breadcrumb_font {
            text_style.font_family = font.family.clone();
            text_style.font_features = font.features.clone();
            text_style.font_style = font.style;
            text_style.font_weight = font.weight;
        }
        text_style.color = Color::Muted.color(cx);

        if index == 0
            && !workspace::TabBarSettings::get_global(cx).show
            && active_item.is_dirty(cx)
            && let Some(styled_element) = apply_dirty_filename_style(&segment, &text_style, cx)
        {
            return styled_element;
        }

        StyledText::new(segment.text.replace('\n', " "))
            .with_default_highlights(&text_style, segment.highlights)
            .into_any()
    });

    let breadcrumbs = Itertools::intersperse_with(highlighted_segments, || {
        Label::new("›").color(Color::Placeholder).into_any_element()
    });

    let breadcrumbs_stack = h_flex()
        .gap_1()
        .when(multibuffer_header, |this| {
            this.pl_2()
                .border_l_1()
                .border_color(cx.theme().colors().border.opacity(0.6))
        })
        .children(breadcrumbs);

    let breadcrumbs = if let Some(prefix) = prefix {
        h_flex().gap_1p5().child(prefix).child(breadcrumbs_stack)
    } else {
        breadcrumbs_stack
    };

    let editor = active_item
        .downcast::<Editor>()
        .map(|editor| editor.downgrade());

    let has_project_path = active_item.project_path(cx).is_some();

    match editor {
        Some(editor) => element
            .id("breadcrumb_container")
            .when(!multibuffer_header, |this| this.overflow_x_scroll())
            .child(
                ButtonLike::new("toggle outline view")
                    .child(breadcrumbs)
                    .when(multibuffer_header, |this| {
                        this.style(ButtonStyle::Transparent)
                    })
                    .when(!multibuffer_header, |this| {
                        let focus_handle = editor.upgrade().unwrap().focus_handle(&cx);

                        this.tooltip(Tooltip::element(move |_window, cx| {
                            v_flex()
                                .gap_1()
                                .child(
                                    h_flex()
                                        .gap_1()
                                        .justify_between()
                                        .child(Label::new("Show Symbol Outline"))
                                        .child(ui::KeyBinding::for_action_in(
                                            &zed_actions::outline::ToggleOutline,
                                            &focus_handle,
                                            cx,
                                        )),
                                )
                                .when(has_project_path, |this| {
                                    this.child(
                                        h_flex()
                                            .gap_1()
                                            .justify_between()
                                            .pt_1()
                                            .border_t_1()
                                            .border_color(cx.theme().colors().border_variant)
                                            .child(Label::new("Right-Click to Copy Path")),
                                    )
                                })
                                .into_any_element()
                        }))
                        .on_click({
                            let editor = editor.clone();
                            move |_, window, cx| {
                                if let Some((editor, callback)) = editor
                                    .upgrade()
                                    .zip(zed_actions::outline::TOGGLE_OUTLINE.get())
                                {
                                    callback(editor.to_any_view(), window, cx);
                                }
                            }
                        })
                        .when(has_project_path, |this| {
                            this.on_right_click({
                                let editor = editor.clone();
                                move |_, _, cx| {
                                    if let Some(abs_path) = editor.upgrade().and_then(|editor| {
                                        editor.update(cx, |editor, cx| {
                                            editor.target_file_abs_path(cx)
                                        })
                                    }) {
                                        if let Some(path_str) = abs_path.to_str() {
                                            cx.write_to_clipboard(ClipboardItem::new_string(
                                                path_str.to_string(),
                                            ));
                                        }
                                    }
                                }
                            })
                        })
                    }),
            )
            .into_any_element(),
        None => element
            .h(rems_from_px(22.)) // Match the height and padding of the `ButtonLike` in the other arm.
            .pl_1()
            .child(breadcrumbs)
            .into_any_element(),
    }
}

fn apply_dirty_filename_style(
    segment: &HighlightedText,
    text_style: &gpui::TextStyle,
    cx: &App,
) -> Option<gpui::AnyElement> {
    let text = segment.text.replace('\n', " ");

    let filename_position = std::path::Path::new(segment.text.as_ref())
        .file_name()
        .and_then(|f| {
            let filename_str = f.to_string_lossy();
            segment.text.rfind(filename_str.as_ref())
        })?;

    let bold_weight = FontWeight::BOLD;
    let default_color = Color::Default.color(cx);

    if filename_position == 0 {
        let mut filename_style = text_style.clone();
        filename_style.font_weight = bold_weight;
        filename_style.color = default_color;

        return Some(
            StyledText::new(text)
                .with_default_highlights(&filename_style, [])
                .into_any(),
        );
    }

    let highlight_style = gpui::HighlightStyle {
        font_weight: Some(bold_weight),
        color: Some(default_color),
        ..Default::default()
    };

    let highlight = vec![(filename_position..text.len(), highlight_style)];
    Some(
        StyledText::new(text)
            .with_default_highlights(text_style, highlight)
            .into_any(),
    )
}

fn render_inline_blame_entry(
    blame_entry: BlameEntry,
    style: &EditorStyle,
    cx: &mut App,
) -> Option<AnyElement> {
    let renderer = cx.global::<GlobalBlameRenderer>().0.clone();
    renderer.render_inline_blame_entry(&style.text, blame_entry, cx)
}

fn render_blame_entry_popover(
    blame_entry: BlameEntry,
    scroll_handle: ScrollHandle,
    commit_message: Option<ParsedCommitMessage>,
    markdown: Entity<Markdown>,
    workspace: WeakEntity<Workspace>,
    blame: &Entity<GitBlame>,
    buffer: BufferId,
    window: &mut Window,
    cx: &mut App,
) -> Option<AnyElement> {
    if markdown.read(cx).is_parsing() {
        return None;
    }

    let renderer = cx.global::<GlobalBlameRenderer>().0.clone();
    let blame = blame.read(cx);
    let repository = blame.repository(cx, buffer)?;
    renderer.render_blame_entry_popover(
        blame_entry,
        scroll_handle,
        commit_message,
        markdown,
        repository,
        workspace,
        window,
        cx,
    )
}

fn render_blame_entry(
    ix: usize,
    blame: &Entity<GitBlame>,
    blame_entry: BlameEntry,
    style: &EditorStyle,
    last_used_color: &mut Option<(Hsla, Oid)>,
    editor: Entity<Editor>,
    workspace: Entity<Workspace>,
    buffer: BufferId,
    renderer: &dyn BlameRenderer,
    window: &mut Window,
    cx: &mut App,
) -> Option<AnyElement> {
    let index: u32 = blame_entry.sha.into();
    let mut sha_color = cx.theme().players().color_for_participant(index).cursor;

    // If the last color we used is the same as the one we get for this line, but
    // the commit SHAs are different, then we try again to get a different color.
    if let Some((color, sha)) = *last_used_color
        && sha != blame_entry.sha
        && color == sha_color
    {
        sha_color = cx.theme().players().color_for_participant(index + 1).cursor;
    }
    last_used_color.replace((sha_color, blame_entry.sha));

    let blame = blame.read(cx);
    let details = blame.details_for_entry(buffer, &blame_entry);
    let repository = blame.repository(cx, buffer)?;
    renderer.render_blame_entry(
        &style.text,
        blame_entry,
        details,
        repository,
        workspace.downgrade(),
        editor,
        ix,
        sha_color,
        window,
        cx,
    )
}

#[derive(Debug)]
pub(crate) struct LineWithInvisibles {
    fragments: SmallVec<[LineFragment; 1]>,
    invisibles: Vec<Invisible>,
    len: usize,
    pub(crate) width: Pixels,
    font_size: Pixels,
}

enum LineFragment {
    Text(ShapedLine),
    Element {
        id: ChunkRendererId,
        element: Option<AnyElement>,
        size: Size<Pixels>,
        len: usize,
    },
}

impl fmt::Debug for LineFragment {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            LineFragment::Text(shaped_line) => f.debug_tuple("Text").field(shaped_line).finish(),
            LineFragment::Element { size, len, .. } => f
                .debug_struct("Element")
                .field("size", size)
                .field("len", len)
                .finish(),
        }
    }
}

impl LineWithInvisibles {
    fn from_chunks<'a>(
        chunks: impl Iterator<Item = HighlightedChunk<'a>>,
        editor_style: &EditorStyle,
        max_line_len: usize,
        max_line_count: usize,
        editor_mode: &EditorMode,
        text_width: Pixels,
        is_row_soft_wrapped: impl Copy + Fn(usize) -> bool,
        bg_segments_per_row: &[Vec<(Range<DisplayPoint>, Hsla)>],
        window: &mut Window,
        cx: &mut App,
    ) -> Vec<Self> {
        let text_style = &editor_style.text;
        let mut layouts = Vec::with_capacity(max_line_count);
        let mut fragments: SmallVec<[LineFragment; 1]> = SmallVec::new();
        let mut line = String::new();
        // Byte offset into the logical line used to position invisible markers.
        // Unlike `line`, this is not cleared when we flush `shape_line` for
        // mid-line inlays/replacements, so marker offsets stay correct in that case.
        let mut line_byte_offset: usize = 0;
        let mut invisibles = Vec::new();
        let mut width = Pixels::ZERO;
        let mut len = 0;
        let mut styles = Vec::new();
        let mut non_whitespace_added = false;
        let mut row = 0;
        let mut line_exceeded_max_len = false;
        let font_size = text_style.font_size.to_pixels(window.rem_size());
        let min_contrast = EditorSettings::get_global(cx).minimum_contrast_for_highlights;

        let ellipsis = SharedString::from("⋯");

        for highlighted_chunk in chunks.chain([HighlightedChunk {
            text: "\n",
            style: None,
            is_tab: false,
            is_inlay: false,
            replacement: None,
        }]) {
            if let Some(replacement) = highlighted_chunk.replacement {
                if line_exceeded_max_len {
                    continue;
                }

                if len + line.len() + highlighted_chunk.text.len() > max_line_len {
                    line_exceeded_max_len = true;
                    continue;
                }

                if !line.is_empty() {
                    let segments = bg_segments_per_row.get(row).map(|v| &v[..]).unwrap_or(&[]);
                    let text_runs: &[TextRun] = if segments.is_empty() {
                        &styles
                    } else {
                        &Self::split_runs_by_bg_segments(&styles, segments, min_contrast, len)
                    };
                    let shaped_line = window.text_system().shape_line(
                        line.clone().into(),
                        font_size,
                        text_runs,
                        None,
                    );
                    width += shaped_line.width;
                    len += shaped_line.len;
                    fragments.push(LineFragment::Text(shaped_line));
                    line.clear();
                    styles.clear();
                }

                match replacement {
                    ChunkReplacement::Renderer(renderer) => {
                        let available_width = if renderer.constrain_width {
                            let chunk = if highlighted_chunk.text == ellipsis.as_ref() {
                                ellipsis.clone()
                            } else {
                                SharedString::from(Arc::from(highlighted_chunk.text))
                            };
                            let shaped_line = window.text_system().shape_line(
                                chunk,
                                font_size,
                                &[text_style.to_run(highlighted_chunk.text.len())],
                                None,
                            );
                            AvailableSpace::Definite(shaped_line.width)
                        } else {
                            AvailableSpace::MinContent
                        };

                        let mut element = (renderer.render)(&mut ChunkRendererContext {
                            context: cx,
                            window,
                            max_width: text_width,
                        });
                        let line_height = text_style.line_height_in_pixels(window.rem_size());
                        let size = element.layout_as_root(
                            size(available_width, AvailableSpace::Definite(line_height)),
                            window,
                            cx,
                        );

                        width += size.width;
                        len += highlighted_chunk.text.len();
                        line_byte_offset += highlighted_chunk.text.len();
                        fragments.push(LineFragment::Element {
                            id: renderer.id,
                            element: Some(element),
                            size,
                            len: highlighted_chunk.text.len(),
                        });
                    }
                    ChunkReplacement::Str(x) => {
                        let text_style = if let Some(style) = highlighted_chunk.style {
                            Cow::Owned(text_style.clone().highlight(style))
                        } else {
                            Cow::Borrowed(text_style)
                        };

                        let run = TextRun {
                            len: x.len(),
                            font: text_style.font(),
                            color: text_style.color,
                            background_color: text_style.background_color,
                            underline: text_style.underline,
                            strikethrough: text_style.strikethrough,
                        };
                        let line_layout = window
                            .text_system()
                            .shape_line(x, font_size, &[run], None)
                            .with_len(highlighted_chunk.text.len());

                        width += line_layout.width;
                        len += highlighted_chunk.text.len();
                        line_byte_offset += highlighted_chunk.text.len();
                        fragments.push(LineFragment::Text(line_layout))
                    }
                }
            } else {
                for (ix, mut line_chunk) in highlighted_chunk.text.split('\n').enumerate() {
                    if ix > 0 {
                        let segments = bg_segments_per_row.get(row).map(|v| &v[..]).unwrap_or(&[]);
                        let text_runs = if segments.is_empty() {
                            &styles
                        } else {
                            &Self::split_runs_by_bg_segments(&styles, segments, min_contrast, len)
                        };
                        let shaped_line = window.text_system().shape_line(
                            line.clone().into(),
                            font_size,
                            text_runs,
                            None,
                        );
                        width += shaped_line.width;
                        len += shaped_line.len;
                        fragments.push(LineFragment::Text(shaped_line));
                        layouts.push(Self {
                            width: mem::take(&mut width),
                            len: mem::take(&mut len),
                            fragments: mem::take(&mut fragments),
                            invisibles: std::mem::take(&mut invisibles),
                            font_size,
                        });

                        line.clear();
                        line_byte_offset = 0;
                        styles.clear();
                        row += 1;
                        line_exceeded_max_len = false;
                        non_whitespace_added = false;
                        if row == max_line_count {
                            return layouts;
                        }
                    }

                    if !line_chunk.is_empty() && !line_exceeded_max_len {
                        let text_style = if let Some(style) = highlighted_chunk.style {
                            Cow::Owned(text_style.clone().highlight(style))
                        } else {
                            Cow::Borrowed(text_style)
                        };

                        let current_line_len = len + line.len();
                        if current_line_len + line_chunk.len() > max_line_len {
                            let mut chunk_len = max_line_len - current_line_len;
                            while !line_chunk.is_char_boundary(chunk_len) {
                                chunk_len -= 1;
                            }
                            line_chunk = &line_chunk[..chunk_len];
                            line_exceeded_max_len = true;
                        }

                        if line_chunk.is_empty() {
                            continue;
                        }

                        styles.push(TextRun {
                            len: line_chunk.len(),
                            font: text_style.font(),
                            color: text_style.color,
                            background_color: text_style.background_color,
                            underline: text_style.underline,
                            strikethrough: text_style.strikethrough,
                        });

                        if editor_mode.is_full() && !highlighted_chunk.is_inlay {
                            // Line wrap pads its contents with fake whitespaces,
                            // avoid printing them
                            let is_soft_wrapped = is_row_soft_wrapped(row);
                            if highlighted_chunk.is_tab {
                                if non_whitespace_added || !is_soft_wrapped {
                                    invisibles.push(Invisible::Tab {
                                        line_start_offset: line_byte_offset,
                                        line_end_offset: line_byte_offset + line_chunk.len(),
                                    });
                                }
                            } else {
                                invisibles.extend(line_chunk.char_indices().filter_map(
                                    |(index, c)| {
                                        let is_whitespace = c.is_whitespace();
                                        non_whitespace_added |= !is_whitespace;
                                        if is_whitespace
                                            && (non_whitespace_added || !is_soft_wrapped)
                                        {
                                            Some(Invisible::Whitespace {
                                                line_start_offset: line_byte_offset + index,
                                                line_end_offset: line_byte_offset
                                                    + index
                                                    + c.len_utf8(),
                                            })
                                        } else {
                                            None
                                        }
                                    },
                                ))
                            }
                        }

                        line.push_str(line_chunk);
                        line_byte_offset += line_chunk.len();
                    }
                }
            }
        }

        layouts
    }

    /// Takes text runs and non-overlapping left-to-right background ranges with color.
    /// Returns new text runs with adjusted contrast as per background ranges.
    fn split_runs_by_bg_segments(
        text_runs: &[TextRun],
        bg_segments: &[(Range<DisplayPoint>, Hsla)],
        min_contrast: f32,
        start_col_offset: usize,
    ) -> Vec<TextRun> {
        let mut output_runs: Vec<TextRun> = Vec::with_capacity(text_runs.len());
        let mut line_col = start_col_offset;
        let mut segment_ix = 0usize;

        for text_run in text_runs.iter() {
            let run_start_col = line_col;
            let run_end_col = run_start_col + text_run.len;
            while segment_ix < bg_segments.len()
                && (bg_segments[segment_ix].0.end.column() as usize) <= run_start_col
            {
                segment_ix += 1;
            }
            let mut cursor_col = run_start_col;
            let mut local_segment_ix = segment_ix;
            while local_segment_ix < bg_segments.len() {
                let (range, segment_color) = &bg_segments[local_segment_ix];
                let segment_start_col = range.start.column() as usize;
                let segment_end_col = range.end.column() as usize;
                if segment_start_col >= run_end_col {
                    break;
                }
                if segment_start_col > cursor_col {
                    let span_len = segment_start_col - cursor_col;
                    output_runs.push(TextRun {
                        len: span_len,
                        font: text_run.font.clone(),
                        color: text_run.color,
                        background_color: text_run.background_color,
                        underline: text_run.underline,
                        strikethrough: text_run.strikethrough,
                    });
                    cursor_col = segment_start_col;
                }
                let segment_slice_end_col = segment_end_col.min(run_end_col);
                if segment_slice_end_col > cursor_col {
                    let new_text_color =
                        ensure_minimum_contrast(text_run.color, *segment_color, min_contrast);
                    output_runs.push(TextRun {
                        len: segment_slice_end_col - cursor_col,
                        font: text_run.font.clone(),
                        color: new_text_color,
                        background_color: text_run.background_color,
                        underline: text_run.underline,
                        strikethrough: text_run.strikethrough,
                    });
                    cursor_col = segment_slice_end_col;
                }
                if segment_end_col >= run_end_col {
                    break;
                }
                local_segment_ix += 1;
            }
            if cursor_col < run_end_col {
                output_runs.push(TextRun {
                    len: run_end_col - cursor_col,
                    font: text_run.font.clone(),
                    color: text_run.color,
                    background_color: text_run.background_color,
                    underline: text_run.underline,
                    strikethrough: text_run.strikethrough,
                });
            }
            line_col = run_end_col;
            segment_ix = local_segment_ix;
        }
        output_runs
    }

    fn prepaint(
        &mut self,
        line_height: Pixels,
        scroll_position: gpui::Point<ScrollOffset>,
        scroll_pixel_position: gpui::Point<ScrollPixelOffset>,
        row: DisplayRow,
        content_origin: gpui::Point<Pixels>,
        line_elements: &mut SmallVec<[AnyElement; 1]>,
        window: &mut Window,
        cx: &mut App,
    ) {
        let line_y = f32::from(line_height) * Pixels::from(row.as_f64() - scroll_position.y);
        self.prepaint_with_custom_offset(
            line_height,
            scroll_pixel_position,
            content_origin,
            line_y,
            line_elements,
            window,
            cx,
        );
    }

    fn prepaint_with_custom_offset(
        &mut self,
        line_height: Pixels,
        scroll_pixel_position: gpui::Point<ScrollPixelOffset>,
        content_origin: gpui::Point<Pixels>,
        line_y: Pixels,
        line_elements: &mut SmallVec<[AnyElement; 1]>,
        window: &mut Window,
        cx: &mut App,
    ) {
        let mut fragment_origin =
            content_origin + gpui::point(Pixels::from(-scroll_pixel_position.x), line_y);
        for fragment in &mut self.fragments {
            match fragment {
                LineFragment::Text(line) => {
                    fragment_origin.x += line.width;
                }
                LineFragment::Element { element, size, .. } => {
                    let mut element = element
                        .take()
                        .expect("you can't prepaint LineWithInvisibles twice");

                    // Center the element vertically within the line.
                    let mut element_origin = fragment_origin;
                    element_origin.y += (line_height - size.height) / 2.;
                    element.prepaint_at(element_origin, window, cx);
                    line_elements.push(element);

                    fragment_origin.x += size.width;
                }
            }
        }
    }

    fn draw(
        &self,
        layout: &EditorLayout,
        row: DisplayRow,
        content_origin: gpui::Point<Pixels>,
        whitespace_setting: ShowWhitespaceSetting,
        selection_ranges: &[Range<DisplayPoint>],
        window: &mut Window,
        cx: &mut App,
    ) {
        self.draw_with_custom_offset(
            layout,
            row,
            content_origin,
            layout.position_map.line_height
                * (row.as_f64() - layout.position_map.scroll_position.y) as f32,
            whitespace_setting,
            selection_ranges,
            window,
            cx,
        );
    }

    fn draw_with_custom_offset(
        &self,
        layout: &EditorLayout,
        row: DisplayRow,
        content_origin: gpui::Point<Pixels>,
        line_y: Pixels,
        whitespace_setting: ShowWhitespaceSetting,
        selection_ranges: &[Range<DisplayPoint>],
        window: &mut Window,
        cx: &mut App,
    ) {
        let line_height = layout.position_map.line_height;
        let mut fragment_origin = content_origin
            + gpui::point(
                Pixels::from(-layout.position_map.scroll_pixel_position.x),
                line_y,
            );

        for fragment in &self.fragments {
            match fragment {
                LineFragment::Text(line) => {
                    line.paint(
                        fragment_origin,
                        line_height,
                        layout.text_align,
                        Some(layout.content_width),
                        window,
                        cx,
                    )
                    .log_err();
                    fragment_origin.x += line.width;
                }
                LineFragment::Element { size, .. } => {
                    fragment_origin.x += size.width;
                }
            }
        }

        self.draw_invisibles(
            selection_ranges,
            layout,
            content_origin,
            line_y,
            row,
            line_height,
            whitespace_setting,
            window,
            cx,
        );
    }

    fn draw_background(
        &self,
        layout: &EditorLayout,
        row: DisplayRow,
        content_origin: gpui::Point<Pixels>,
        window: &mut Window,
        cx: &mut App,
    ) {
        let line_height = layout.position_map.line_height;
        let line_y = line_height * (row.as_f64() - layout.position_map.scroll_position.y) as f32;

        let mut fragment_origin = content_origin
            + gpui::point(
                Pixels::from(-layout.position_map.scroll_pixel_position.x),
                line_y,
            );

        for fragment in &self.fragments {
            match fragment {
                LineFragment::Text(line) => {
                    line.paint_background(
                        fragment_origin,
                        line_height,
                        layout.text_align,
                        Some(layout.content_width),
                        window,
                        cx,
                    )
                    .log_err();
                    fragment_origin.x += line.width;
                }
                LineFragment::Element { size, .. } => {
                    fragment_origin.x += size.width;
                }
            }
        }
    }

    fn draw_invisibles(
        &self,
        selection_ranges: &[Range<DisplayPoint>],
        layout: &EditorLayout,
        content_origin: gpui::Point<Pixels>,
        line_y: Pixels,
        row: DisplayRow,
        line_height: Pixels,
        whitespace_setting: ShowWhitespaceSetting,
        window: &mut Window,
        cx: &mut App,
    ) {
        let extract_whitespace_info = |invisible: &Invisible| {
            let (token_offset, token_end_offset, invisible_symbol) = match invisible {
                Invisible::Tab {
                    line_start_offset,
                    line_end_offset,
                } => (*line_start_offset, *line_end_offset, &layout.tab_invisible),
                Invisible::Whitespace {
                    line_start_offset,
                    line_end_offset,
                } => (
                    *line_start_offset,
                    *line_end_offset,
                    &layout.space_invisible,
                ),
            };

            let token_x = self.x_for_index(token_offset);
            // Center the marker inside the actual glyph's width so it lines up with
            // proportional fonts instead of assuming a monospace `em_width` cell.
            let glyph_width = (self.x_for_index(token_end_offset) - token_x).max(Pixels::ZERO);
            let x_offset: ScrollPixelOffset = token_x.into();
            let invisible_offset: ScrollPixelOffset =
                ((glyph_width - invisible_symbol.width).max(Pixels::ZERO) / 2.0).into();
            let origin = content_origin
                + gpui::point(
                    Pixels::from(
                        x_offset + invisible_offset - layout.position_map.scroll_pixel_position.x,
                    ),
                    line_y,
                );

            (
                [token_offset, token_end_offset],
                Box::new(move |window: &mut Window, cx: &mut App| {
                    invisible_symbol
                        .paint(origin, line_height, TextAlign::Left, None, window, cx)
                        .log_err();
                }),
            )
        };

        let invisible_iter = self.invisibles.iter().map(extract_whitespace_info);
        match whitespace_setting {
            ShowWhitespaceSetting::None => (),
            ShowWhitespaceSetting::All => invisible_iter.for_each(|(_, paint)| paint(window, cx)),
            ShowWhitespaceSetting::Selection => invisible_iter.for_each(|([start, _], paint)| {
                let invisible_point = DisplayPoint::new(row, start as u32);
                if !selection_ranges
                    .iter()
                    .any(|region| region.start <= invisible_point && invisible_point < region.end)
                {
                    return;
                }

                paint(window, cx);
            }),

            ShowWhitespaceSetting::Trailing => {
                let mut previous_start = self.len;
                for ([start, end], paint) in invisible_iter.rev() {
                    if previous_start != end {
                        break;
                    }
                    previous_start = start;
                    paint(window, cx);
                }
            }

            // For a whitespace to be on a boundary, any of the following conditions need to be met:
            // - It is a tab
            // - It is adjacent to an edge (start or end)
            // - It is adjacent to a whitespace (left or right)
            ShowWhitespaceSetting::Boundary => {
                // We'll need to keep track of the last invisible we've seen and then check if we are adjacent to it for some of
                // the above cases.
                // Note: We zip in the original `invisibles` to check for tab equality
                let mut last_seen: Option<(bool, usize, Box<dyn Fn(&mut Window, &mut App)>)> = None;
                for (([start, end], paint), invisible) in
                    invisible_iter.zip_eq(self.invisibles.iter())
                {
                    let should_render = match (&last_seen, invisible) {
                        (_, Invisible::Tab { .. }) => true,
                        (Some((_, last_end, _)), _) => *last_end == start,
                        _ => false,
                    };

                    if should_render || start == 0 || end == self.len {
                        paint(window, cx);

                        // Since we are scanning from the left, we will skip over the first available whitespace that is part
                        // of a boundary between non-whitespace segments, so we correct by manually redrawing it if needed.
                        if let Some((should_render_last, last_end, paint_last)) = last_seen {
                            // Note that we need to make sure that the last one is actually adjacent
                            if !should_render_last && last_end == start {
                                paint_last(window, cx);
                            }
                        }
                    }

                    // Manually render anything within a selection
                    let invisible_point = DisplayPoint::new(row, start as u32);
                    if selection_ranges.iter().any(|region| {
                        region.start <= invisible_point && invisible_point < region.end
                    }) {
                        paint(window, cx);
                    }

                    last_seen = Some((should_render, end, paint));
                }
            }
        }
    }

    pub fn x_for_index(&self, index: usize) -> Pixels {
        let mut fragment_start_x = Pixels::ZERO;
        let mut fragment_start_index = 0;

        for fragment in &self.fragments {
            match fragment {
                LineFragment::Text(shaped_line) => {
                    let fragment_end_index = fragment_start_index + shaped_line.len;
                    if index < fragment_end_index {
                        return fragment_start_x
                            + shaped_line.x_for_index(index - fragment_start_index);
                    }
                    fragment_start_x += shaped_line.width;
                    fragment_start_index = fragment_end_index;
                }
                LineFragment::Element { len, size, .. } => {
                    let fragment_end_index = fragment_start_index + len;
                    if index < fragment_end_index {
                        return fragment_start_x;
                    }
                    fragment_start_x += size.width;
                    fragment_start_index = fragment_end_index;
                }
            }
        }

        fragment_start_x
    }

    pub fn index_for_x(&self, x: Pixels) -> Option<usize> {
        let mut fragment_start_x = Pixels::ZERO;
        let mut fragment_start_index = 0;

        for fragment in &self.fragments {
            match fragment {
                LineFragment::Text(shaped_line) => {
                    let fragment_end_x = fragment_start_x + shaped_line.width;
                    if x < fragment_end_x {
                        return Some(
                            fragment_start_index + shaped_line.index_for_x(x - fragment_start_x)?,
                        );
                    }
                    fragment_start_x = fragment_end_x;
                    fragment_start_index += shaped_line.len;
                }
                LineFragment::Element { len, size, .. } => {
                    let fragment_end_x = fragment_start_x + size.width;
                    if x < fragment_end_x {
                        return Some(fragment_start_index);
                    }
                    fragment_start_index += len;
                    fragment_start_x = fragment_end_x;
                }
            }
        }

        None
    }

    pub fn font_id_for_index(&self, index: usize) -> Option<FontId> {
        let mut fragment_start_index = 0;

        for fragment in &self.fragments {
            match fragment {
                LineFragment::Text(shaped_line) => {
                    let fragment_end_index = fragment_start_index + shaped_line.len;
                    if index < fragment_end_index {
                        return shaped_line.font_id_for_index(index - fragment_start_index);
                    }
                    fragment_start_index = fragment_end_index;
                }
                LineFragment::Element { len, .. } => {
                    let fragment_end_index = fragment_start_index + len;
                    if index < fragment_end_index {
                        return None;
                    }
                    fragment_start_index = fragment_end_index;
                }
            }
        }

        None
    }

    pub fn alignment_offset(&self, text_align: TextAlign, content_width: Pixels) -> Pixels {
        let line_width = self.width;
        match text_align {
            TextAlign::Left => px(0.0),
            TextAlign::Center => (content_width - line_width) / 2.0,
            TextAlign::Right => content_width - line_width,
        }
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum Invisible {
    /// A tab character
    ///
    /// A tab character is internally represented by spaces (configured by the user's tab width)
    /// aligned to the nearest column, so it's necessary to store the start and end offset for
    /// adjacency checks.
    Tab {
        line_start_offset: usize,
        line_end_offset: usize,
    },
    /// A whitespace character (ASCII space or any other Unicode whitespace).
    ///
    /// Storing both offsets correctly accounts for multi-byte whitespace characters
    /// such as U+00A0 NO-BREAK SPACE, keeping adjacency checks correct.
    Whitespace {
        line_start_offset: usize,
        line_end_offset: usize,
    },
}

impl EditorElement {
    /// Returns the rem size to use when rendering the [`EditorElement`].
    ///
    /// This allows UI elements to scale based on the `buffer_font_size`.
    fn rem_size(&self, cx: &mut App) -> Option<Pixels> {
        match self.editor.read(cx).mode {
            EditorMode::Full {
                scale_ui_elements_with_buffer_font_size: true,
                ..
            }
            | EditorMode::Minimap { .. } => {
                let buffer_font_size = self.style.text.font_size;
                match buffer_font_size {
                    AbsoluteLength::Pixels(pixels) => {
                        let rem_size_scale = {
                            // Our default UI font size is 14px on a 16px base scale.
                            // This means the default UI font size is 0.875rems.
                            let default_font_size_scale = 14. / ui::BASE_REM_SIZE_IN_PX;

                            // We then determine the delta between a single rem and the default font
                            // size scale.
                            let default_font_size_delta = 1. - default_font_size_scale;

                            // Finally, we add this delta to 1rem to get the scale factor that
                            // should be used to scale up the UI.
                            1. + default_font_size_delta
                        };

                        Some(pixels * rem_size_scale)
                    }
                    AbsoluteLength::Rems(rems) => {
                        Some(rems.to_pixels(ui::BASE_REM_SIZE_IN_PX.into()))
                    }
                }
            }
            // We currently use single-line and auto-height editors in UI contexts,
            // so we don't want to scale everything with the buffer font size, as it
            // ends up looking off.
            _ => None,
        }
    }

    fn editor_with_selections(&self, cx: &App) -> Option<Entity<Editor>> {
        if let EditorMode::Minimap { parent } = self.editor.read(cx).mode() {
            parent.upgrade()
        } else {
            Some(self.editor.clone())
        }
    }
}

#[derive(Default)]
pub struct EditorRequestLayoutState {
    // We use prepaint depth to limit the number of times prepaint is
    // called recursively. We need this so that we can update stale
    // data for e.g. block heights in block map.
    prepaint_depth: Rc<Cell<usize>>,
}

impl EditorRequestLayoutState {
    // In ideal conditions we only need one more subsequent prepaint call for resize to take effect.
    // i.e. MAX_PREPAINT_DEPTH = 2, but placing near blocks can expose more lines from below, and
    // we end up querying blocks for those lines too in subsequent renders.
    // Setting MAX_PREPAINT_DEPTH = 3, passes all tests. Just to be on the safe side we set it to 5, so
    // that subsequent shrinking does not lead to incorrect block placing.
    const MAX_PREPAINT_DEPTH: usize = 5;

    fn increment_prepaint_depth(&self) -> EditorPrepaintGuard {
        let depth = self.prepaint_depth.get();
        self.prepaint_depth.set(depth + 1);
        EditorPrepaintGuard {
            prepaint_depth: self.prepaint_depth.clone(),
        }
    }

    fn has_remaining_prepaint_depth(&self) -> bool {
        self.prepaint_depth.get() < Self::MAX_PREPAINT_DEPTH
    }
}

struct EditorPrepaintGuard {
    prepaint_depth: Rc<Cell<usize>>,
}

impl Drop for EditorPrepaintGuard {
    fn drop(&mut self) {
        let depth = self.prepaint_depth.get();
        self.prepaint_depth.set(depth.saturating_sub(1));
    }
}

impl Element for EditorElement {
    type RequestLayoutState = EditorRequestLayoutState;
    type PrepaintState = EditorLayout;

    fn id(&self) -> Option<ElementId> {
        None
    }

    fn source_location(&self) -> Option<&'static core::panic::Location<'static>> {
        None
    }

    fn request_layout(
        &mut self,
        _: Option<&GlobalElementId>,
        _inspector_id: Option<&gpui::InspectorElementId>,
        window: &mut Window,
        cx: &mut App,
    ) -> (gpui::LayoutId, Self::RequestLayoutState) {
        let rem_size = self.rem_size(cx);
        window.with_rem_size(rem_size, |window| {
            self.editor.update(cx, |editor, cx| {
                editor.set_style(self.style.clone(), window, cx);

                let layout_id = match editor.mode {
                    EditorMode::SingleLine => {
                        let rem_size = window.rem_size();
                        let height = self.style.text.line_height_in_pixels(rem_size);
                        let mut style = Style::default();
                        style.size.height = height.into();
                        style.size.width = relative(1.).into();
                        window.request_layout(style, None, cx)
                    }
                    EditorMode::AutoHeight {
                        min_lines,
                        max_lines,
                    } => {
                        let editor_handle = cx.entity();
                        window.request_measured_layout(
                            Style::default(),
                            move |known_dimensions, available_space, window, cx| {
                                editor_handle
                                    .update(cx, |editor, cx| {
                                        compute_auto_height_layout(
                                            editor,
                                            min_lines,
                                            max_lines,
                                            known_dimensions,
                                            available_space.width,
                                            window,
                                            cx,
                                        )
                                    })
                                    .unwrap_or_default()
                            },
                        )
                    }
                    EditorMode::Minimap { .. } => {
                        let mut style = Style::default();
                        style.size.width = relative(1.).into();
                        style.size.height = relative(1.).into();
                        window.request_layout(style, None, cx)
                    }
                    EditorMode::Full {
                        sizing_behavior, ..
                    } => {
                        let mut style = Style::default();
                        style.size.width = relative(1.).into();
                        if sizing_behavior == SizingBehavior::SizeByContent {
                            let snapshot = editor.snapshot(window, cx);
                            let line_height =
                                self.style.text.line_height_in_pixels(window.rem_size());
                            let scroll_height =
                                (snapshot.max_point().row().next_row().0 as f32) * line_height;
                            style.size.height = scroll_height.into();
                        } else {
                            style.size.height = relative(1.).into();
                        }
                        window.request_layout(style, None, cx)
                    }
                };

                (layout_id, EditorRequestLayoutState::default())
            })
        })
    }

    fn prepaint(
        &mut self,
        _: Option<&GlobalElementId>,
        _inspector_id: Option<&gpui::InspectorElementId>,
        bounds: Bounds<Pixels>,
        request_layout: &mut Self::RequestLayoutState,
        window: &mut Window,
        cx: &mut App,
    ) -> Self::PrepaintState {
        let _prepaint_depth_guard = request_layout.increment_prepaint_depth();
        let text_style = TextStyleRefinement {
            font_size: Some(self.style.text.font_size),
            line_height: Some(self.style.text.line_height),
            ..Default::default()
        };

        let is_minimap = self.editor.read(cx).mode.is_minimap();
        let is_singleton = self.editor.read(cx).buffer_kind(cx) == ItemBufferKind::Singleton;

        if !is_minimap {
            let focus_handle = self.editor.focus_handle(cx);
            window.set_view_id(self.editor.entity_id());
            window.set_focus_handle(&focus_handle, cx);
        }

        let rem_size = self.rem_size(cx);
        window.with_rem_size(rem_size, |window| {
            window.with_text_style(Some(text_style), |window| {
                window.with_content_mask(Some(ContentMask { bounds }), |window| {
                    let (mut snapshot, is_read_only) = self.editor.update(cx, |editor, cx| {
                        (editor.snapshot(window, cx), editor.read_only(cx))
                    });
                    let style = &self.style;

                    let rem_size = window.rem_size();
                    let font_id = window.text_system().resolve_font(&style.text.font());
                    let font_size = style.text.font_size.to_pixels(rem_size);
                    let line_height = style.text.line_height_in_pixels(rem_size);
                    let em_width = window.text_system().em_width(font_id, font_size).unwrap();
                    let em_advance = window.text_system().em_advance(font_id, font_size).unwrap();
                    let em_layout_width = window.text_system().em_layout_width(font_id, font_size);
                    let glyph_grid_cell = size(em_advance, line_height);

                    let gutter_dimensions =
                        snapshot.gutter_dimensions(font_id, font_size, style, window, cx);
                    let text_width = bounds.size.width - gutter_dimensions.width;

                    let settings = EditorSettings::get_global(cx);
                    let scrollbars_shown = settings.scrollbar.show != ShowScrollbar::Never;
                    let vertical_scrollbar_width = (scrollbars_shown
                        && settings.scrollbar.axes.vertical
                        && self.editor.read(cx).show_scrollbars.vertical)
                        .then_some(style.scrollbar_width)
                        .unwrap_or_default();
                    let minimap_width = self
                        .get_minimap_width(
                            &settings.minimap,
                            scrollbars_shown,
                            text_width,
                            em_width,
                            font_size,
                            rem_size,
                            cx,
                        )
                        .unwrap_or_default();

                    let right_margin = minimap_width + vertical_scrollbar_width;

                    let extended_right = 2 * em_width + right_margin;
                    let editor_width = text_width - gutter_dimensions.margin - extended_right;
                    let editor_margins = EditorMargins {
                        gutter: gutter_dimensions,
                        right: right_margin,
                        extended_right,
                    };

                    snapshot = self.editor.update(cx, |editor, cx| {
                        editor.last_bounds = Some(bounds);
                        editor.gutter_dimensions = gutter_dimensions;
                        editor.set_visible_line_count(
                            (bounds.size.height / line_height) as f64,
                            window,
                            cx,
                        );
                        editor.set_visible_column_count(f64::from(editor_width / em_advance));

                        if matches!(
                            editor.mode,
                            EditorMode::AutoHeight { .. } | EditorMode::Minimap { .. }
                        ) {
                            snapshot
                        } else {
                            let wrap_width = calculate_wrap_width(
                                editor.soft_wrap_mode(cx),
                                editor_width,
                                em_layout_width,
                            );

                            if editor.set_wrap_width(wrap_width, cx) {
                                editor.snapshot(window, cx)
                            } else {
                                snapshot
                            }
                        }
                    });

                    let hitbox = window.insert_hitbox(bounds, HitboxBehavior::Normal);
                    let gutter_hitbox = window.insert_hitbox(
                        gutter_bounds(bounds, gutter_dimensions),
                        HitboxBehavior::Normal,
                    );
                    let text_hitbox = window.insert_hitbox(
                        Bounds {
                            origin: gutter_hitbox.top_right(),
                            size: size(text_width, bounds.size.height),
                        },
                        HitboxBehavior::Normal,
                    );

                    // Offset the content_bounds from the text_bounds by the gutter margin (which
                    // is roughly half a character wide) to make hit testing work more like how we want.
                    let content_offset = point(editor_margins.gutter.margin, Pixels::ZERO);
                    let content_origin = text_hitbox.origin + content_offset;

                    let height_in_lines = f64::from(bounds.size.height / line_height);
                    let max_row = snapshot.max_point().row().as_f64();

                    // Calculate how much of the editor is clipped by parent containers (e.g., List).
                    // This allows us to only render lines that are actually visible, which is
                    // critical for performance when large AutoHeight editors are inside Lists.
                    let visible_bounds = window.content_mask().bounds;
                    let clipped_top = (visible_bounds.origin.y - bounds.origin.y).max(px(0.));
                    let clipped_top_in_lines = f64::from(clipped_top / line_height);
                    let visible_height_in_lines =
                        f64::from(visible_bounds.size.height / line_height);

                    // The max scroll position for the top of the window
                    let scroll_beyond_last_line = self.editor.read(cx).scroll_beyond_last_line(cx);
                    let max_scroll_top = match scroll_beyond_last_line {
                        ScrollBeyondLastLine::OnePage => max_row,
                        ScrollBeyondLastLine::Off => (max_row - height_in_lines + 1.).max(0.),
                        ScrollBeyondLastLine::VerticalScrollMargin => {
                            let settings = EditorSettings::get_global(cx);
                            (max_row - height_in_lines + 1. + settings.vertical_scroll_margin)
                                .max(0.)
                        }
                    };

                    let (
                        autoscroll_request,
                        autoscroll_containing_element,
                        needs_horizontal_autoscroll,
                    ) = self.editor.update(cx, |editor, cx| {
                        let autoscroll_request = editor.scroll_manager.take_autoscroll_request();

                        let autoscroll_containing_element =
                            autoscroll_request.is_some() || editor.has_pending_selection();

                        let (needs_horizontal_autoscroll, was_scrolled) = editor
                            .autoscroll_vertically(
                                bounds,
                                line_height,
                                max_scroll_top,
                                autoscroll_request,
                                window,
                                cx,
                            );
                        if was_scrolled.0 {
                            snapshot = editor.snapshot(window, cx);
                        }
                        (
                            autoscroll_request,
                            autoscroll_containing_element,
                            needs_horizontal_autoscroll,
                        )
                    });

                    let mut scroll_position = snapshot.scroll_position();
                    if !line_height.is_zero() {
                        scroll_position.y = window
                            .pixel_snap_f64(scroll_position.y * f64::from(line_height))
                            / f64::from(line_height);
                    }
                    // The scroll position is a fractional point, the whole number of which represents
                    // the top of the window in terms of display rows.
                    // We add clipped_top_in_lines to skip rows that are clipped by parent containers,
                    // but we don't modify scroll_position itself since the parent handles positioning.
                    let max_row = snapshot.max_point().row();
                    let start_row = cmp::min(
                        DisplayRow((scroll_position.y + clipped_top_in_lines).floor() as u32),
                        max_row,
                    );
                    let end_row = cmp::min(
                        (scroll_position.y + clipped_top_in_lines + visible_height_in_lines).ceil()
                            as u32,
                        max_row.next_row().0,
                    );
                    let end_row = DisplayRow(end_row);

                    let row_infos = snapshot // note we only get the visual range
                        .row_infos(start_row)
                        .take((start_row..end_row).len())
                        .collect::<Vec<RowInfo>>();
                    let is_row_soft_wrapped = |row: usize| {
                        row_infos
                            .get(row)
                            .is_none_or(|info| info.buffer_row.is_none())
                    };

                    let start_anchor = if start_row == Default::default() {
                        Anchor::Min
                    } else {
                        snapshot.buffer_snapshot().anchor_before(
                            DisplayPoint::new(start_row, 0).to_offset(&snapshot, Bias::Left),
                        )
                    };
                    let end_anchor = if end_row > max_row {
                        Anchor::Max
                    } else {
                        snapshot.buffer_snapshot().anchor_before(
                            DisplayPoint::new(end_row, 0).to_offset(&snapshot, Bias::Right),
                        )
                    };

                    let mut highlighted_rows = self
                        .editor
                        .update(cx, |editor, cx| editor.highlighted_display_rows(window, cx));

                    let mut highlighted_ranges = self
                        .editor_with_selections(cx)
                        .map(|editor| {
                            if editor == self.editor {
                                editor.read(cx).background_highlights_in_range(
                                    start_anchor..end_anchor,
                                    &snapshot.display_snapshot,
                                    cx.theme(),
                                )
                            } else {
                                editor.update(cx, |editor, cx| {
                                    let snapshot = editor.snapshot(window, cx);
                                    let start_anchor = if start_row == Default::default() {
                                        Anchor::Min
                                    } else {
                                        snapshot.buffer_snapshot().anchor_before(
                                            DisplayPoint::new(start_row, 0)
                                                .to_offset(&snapshot, Bias::Left),
                                        )
                                    };
                                    let end_anchor = if end_row > max_row {
                                        Anchor::Max
                                    } else {
                                        snapshot.buffer_snapshot().anchor_before(
                                            DisplayPoint::new(end_row, 0)
                                                .to_offset(&snapshot, Bias::Right),
                                        )
                                    };

                                    editor.background_highlights_in_range(
                                        start_anchor..end_anchor,
                                        &snapshot.display_snapshot,
                                        cx.theme(),
                                    )
                                })
                            }
                        })
                        .unwrap_or_default();

                    struct DiffHunkHighlightColors {
                        filled_background: Hsla,
                        hollow_background: Hsla,
                        hollow_border: Hsla,
                    }

                    let colors = cx.theme().colors();
                    let added_diff_hunk_colors = DiffHunkHighlightColors {
                        filled_background: colors.editor_diff_hunk_added_background,
                        hollow_background: colors.editor_diff_hunk_added_hollow_background,
                        hollow_border: colors.editor_diff_hunk_added_hollow_border,
                    };
                    let deleted_diff_hunk_colors = DiffHunkHighlightColors {
                        filled_background: colors.editor_diff_hunk_deleted_background,
                        hollow_background: colors.editor_diff_hunk_deleted_hollow_background,
                        hollow_border: colors.editor_diff_hunk_deleted_hollow_border,
                    };
                    let drag_highlight_color = colors.editor_active_line_background;
                    let drag_border_color = colors.border_focused;

                    for (ix, row_info) in row_infos.iter().enumerate() {
                        let Some(diff_status) = row_info.diff_status else {
                            continue;
                        };

                        let diff_hunk_colors = match diff_status.kind {
                            DiffHunkStatusKind::Added => &added_diff_hunk_colors,
                            DiffHunkStatusKind::Deleted => &deleted_diff_hunk_colors,
                            DiffHunkStatusKind::Modified => {
                                debug_panic!("modified diff status for row info");
                                continue;
                            }
                        };

                        let hollow_highlight = LineHighlight {
                            background: diff_hunk_colors.hollow_background.into(),
                            border: Some(diff_hunk_colors.hollow_border),
                            include_gutter: true,
                            type_id: None,
                        };

                        let filled_highlight = LineHighlight {
                            background: solid_background(diff_hunk_colors.filled_background),
                            border: None,
                            include_gutter: true,
                            type_id: None,
                        };

                        let background = if Self::diff_hunk_hollow(diff_status, cx) {
                            hollow_highlight
                        } else {
                            filled_highlight
                        };

                        let base_display_point =
                            DisplayPoint::new(start_row + DisplayRow(ix as u32), 0);

                        highlighted_rows
                            .entry(base_display_point.row())
                            .or_insert(background);
                    }

                    // Add diff review drag selection highlight to text area
                    if let Some(drag_state) = &self.editor.read(cx).diff_review_drag_state {
                        let range = drag_state.row_range(&snapshot.display_snapshot);
                        let start_row = range.start().0;
                        let end_row = range.end().0;
                        let drag_highlight = LineHighlight {
                            background: solid_background(drag_highlight_color),
                            border: Some(drag_border_color),
                            include_gutter: true,
                            type_id: None,
                        };
                        for row_num in start_row..=end_row {
                            highlighted_rows
                                .entry(DisplayRow(row_num))
                                .or_insert(drag_highlight);
                        }
                    }

                    let highlighted_gutter_ranges =
                        self.editor.read(cx).gutter_highlights_in_range(
                            start_anchor..end_anchor,
                            &snapshot.display_snapshot,
                            cx,
                        );

                    let document_colors = self
                        .editor
                        .read(cx)
                        .colors
                        .as_ref()
                        .map(|colors| colors.editor_display_highlights(&snapshot));
                    let redacted_ranges = self.editor.read(cx).redacted_ranges(
                        start_anchor..end_anchor,
                        &snapshot.display_snapshot,
                        cx,
                    );

                    let (local_selections, selected_buffer_ids, latest_selection_anchors): (
                        Vec<Selection<Point>>,
                        Vec<BufferId>,
                        HashMap<BufferId, Anchor>,
                    ) = self
                        .editor_with_selections(cx)
                        .map(|editor| {
                            editor.update(cx, |editor, cx| {
                                let all_selections =
                                    editor.selections.all::<Point>(&snapshot.display_snapshot);
                                let all_anchor_selections =
                                    editor.selections.all_anchors(&snapshot.display_snapshot);
                                let selected_buffer_ids =
                                    if editor.buffer_kind(cx) == ItemBufferKind::Singleton {
                                        Vec::new()
                                    } else {
                                        let mut selected_buffer_ids =
                                            Vec::with_capacity(all_selections.len());

                                        for selection in all_selections {
                                            for buffer_id in snapshot
                                                .buffer_snapshot()
                                                .buffer_ids_for_range(selection.range())
                                            {
                                                if selected_buffer_ids.last() != Some(&buffer_id) {
                                                    selected_buffer_ids.push(buffer_id);
                                                }
                                            }
                                        }

                                        selected_buffer_ids
                                    };

                                let mut selections = editor.selections.disjoint_in_range(
                                    start_anchor..end_anchor,
                                    &snapshot.display_snapshot,
                                );
                                selections
                                    .extend(editor.selections.pending(&snapshot.display_snapshot));

                                let mut anchors_by_buffer: HashMap<BufferId, (usize, Anchor)> =
                                    HashMap::default();
                                for selection in all_anchor_selections.iter() {
                                    let head = selection.head();
                                    if let Some((text_anchor, _)) =
                                        snapshot.buffer_snapshot().anchor_to_buffer_anchor(head)
                                    {
                                        anchors_by_buffer
                                            .entry(text_anchor.buffer_id)
                                            .and_modify(|(latest_id, latest_anchor)| {
                                                if selection.id > *latest_id {
                                                    *latest_id = selection.id;
                                                    *latest_anchor = head;
                                                }
                                            })
                                            .or_insert((selection.id, head));
                                    }
                                }
                                let latest_selection_anchors = anchors_by_buffer
                                    .into_iter()
                                    .map(|(buffer_id, (_, anchor))| (buffer_id, anchor))
                                    .collect();

                                (selections, selected_buffer_ids, latest_selection_anchors)
                            })
                        })
                        .unwrap_or_else(|| (Vec::new(), Vec::new(), HashMap::default()));

                    let (selections, mut active_rows, newest_selection_head) = self
                        .layout_selections(
                            start_anchor,
                            end_anchor,
                            &local_selections,
                            &snapshot,
                            start_row,
                            end_row,
                            window,
                            cx,
                        );

                    // relative rows are based on newest selection, even outside the visible area
                    let current_selection_head = self.editor.update(cx, |editor, cx| {
                        (editor.selections.count() != 0).then(|| {
                            let newest = editor
                                .selections
                                .newest::<Point>(&editor.display_snapshot(cx));

                            SelectionLayout::new(
                                newest,
                                editor.selections.line_mode(),
                                editor.cursor_offset_on_selection,
                                editor.cursor_shape,
                                &snapshot,
                                true,
                                true,
                                None,
                            )
                            .head
                            .row()
                        })
                    });

                    let run_indicator_rows = self.editor.update(cx, |editor, cx| {
                        editor.active_run_indicators(start_row..end_row, window, cx)
                    });

                    let mut breakpoint_rows = self.editor.update(cx, |editor, cx| {
                        editor.active_breakpoints(start_row..end_row, window, cx)
                    });

                    for (display_row, (_, bp, state)) in &breakpoint_rows {
                        if bp.is_enabled() && state.is_none_or(|s| s.verified) {
                            active_rows.entry(*display_row).or_default().breakpoint = true;
                        }
                    }

                    let gutter = Gutter {
                        line_height,
                        range: start_row..end_row,
                        scroll_position,
                        dimensions: &gutter_dimensions,
                        hitbox: &gutter_hitbox,
                        snapshot: &snapshot,
                        row_infos: &row_infos,
                    };

                    let line_numbers = self.layout_line_numbers(
                        &gutter,
                        &active_rows,
                        current_selection_head,
                        window,
                        cx,
                    );

                    let mut expand_toggles =
                        window.with_element_namespace("expand_toggles", |window| {
                            self.layout_expand_toggles(
                                &gutter_hitbox,
                                gutter_dimensions,
                                em_width,
                                line_height,
                                scroll_position,
                                start_row,
                                &row_infos,
                                window,
                                cx,
                            )
                        });

                    let mut crease_toggles =
                        window.with_element_namespace("crease_toggles", |window| {
                            self.layout_crease_toggles(
                                start_row..end_row,
                                &row_infos,
                                &active_rows,
                                &snapshot,
                                window,
                                cx,
                            )
                        });
                    let crease_trailers =
                        window.with_element_namespace("crease_trailers", |window| {
                            self.layout_crease_trailers(
                                row_infos.iter().cloned(),
                                &snapshot,
                                window,
                                cx,
                            )
                        });

                    let display_hunks = self.layout_gutter_diff_hunks(
                        line_height,
                        &gutter_hitbox,
                        start_row..end_row,
                        &snapshot,
                        scroll_position,
                        window,
                        cx,
                    );

                    Self::layout_word_diff_highlights(
                        &display_hunks,
                        &row_infos,
                        start_row,
                        &snapshot,
                        &mut highlighted_ranges,
                        cx,
                    );

                    let bg_segments_per_row = Self::bg_segments_per_row(
                        start_row..end_row,
                        &selections,
                        highlighted_ranges.iter().cloned().chain(
                            document_colors
                                .iter()
                                .flat_map(|(_, colors)| colors.iter().cloned()),
                        ),
                        self.style.background,
                    );

                    let mut line_layouts = Self::layout_lines(
                        start_row..end_row,
                        &snapshot,
                        &self.style,
                        editor_width,
                        is_row_soft_wrapped,
                        &bg_segments_per_row,
                        window,
                        cx,
                    );
                    let new_renderer_widths = (!is_minimap).then(|| {
                        line_layouts
                            .iter()
                            .flat_map(|layout| &layout.fragments)
                            .filter_map(|fragment| {
                                if let LineFragment::Element { id, size, .. } = fragment {
                                    Some((*id, size.width))
                                } else {
                                    None
                                }
                            })
                    });
                    let renderer_widths_changed = request_layout.has_remaining_prepaint_depth()
                        && new_renderer_widths.is_some_and(|new_renderer_widths| {
                            self.editor.update(cx, |editor, cx| {
                                editor.update_renderer_widths(new_renderer_widths, cx)
                            })
                        });
                    if renderer_widths_changed {
                        return self.prepaint(
                            None,
                            _inspector_id,
                            bounds,
                            request_layout,
                            window,
                            cx,
                        );
                    }

                    let longest_line_blame_width = self
                        .editor
                        .update(cx, |editor, cx| {
                            if !editor.show_git_blame_inline {
                                return None;
                            }
                            let blame = editor.blame.as_ref()?;
                            let (_, blame_entry) = blame
                                .update(cx, |blame, cx| {
                                    let row_infos =
                                        snapshot.row_infos(snapshot.longest_row()).next()?;
                                    blame.blame_for_rows(&[row_infos], cx).next()
                                })
                                .flatten()?;
                            let mut element = render_inline_blame_entry(blame_entry, style, cx)?;
                            let inline_blame_padding =
                                ProjectSettings::get_global(cx).git.inline_blame.padding as f32
                                    * em_advance;
                            Some(
                                element
                                    .layout_as_root(AvailableSpace::min_size(), window, cx)
                                    .width
                                    + inline_blame_padding,
                            )
                        })
                        .unwrap_or(Pixels::ZERO);

                    let longest_line_width = layout_line(
                        snapshot.longest_row(),
                        &snapshot,
                        style,
                        editor_width,
                        is_row_soft_wrapped,
                        window,
                        cx,
                    )
                    .width;

                    let scrollbar_layout_information = ScrollbarLayoutInformation::new(
                        text_hitbox.bounds,
                        glyph_grid_cell,
                        size(
                            longest_line_width,
                            Pixels::from(max_row.as_f64() * f64::from(line_height)),
                        ),
                        longest_line_blame_width,
                        EditorSettings::get_global(cx),
                        scroll_beyond_last_line,
                    );

                    let mut scroll_width = scrollbar_layout_information.scroll_range.width;

                    let sticky_header_excerpt = if snapshot.buffer_snapshot().show_headers() {
                        snapshot.sticky_header_excerpt(scroll_position.y)
                    } else {
                        None
                    };
                    let sticky_header_excerpt_id = sticky_header_excerpt
                        .as_ref()
                        .map(|top| top.excerpt.buffer_id());

                    let buffer = snapshot.buffer_snapshot();
                    let start_buffer_row = MultiBufferRow(start_anchor.to_point(&buffer).row);
                    let end_buffer_row = MultiBufferRow(end_anchor.to_point(&buffer).row);

                    let preliminary_scroll_pixel_position = point(
                        scroll_position.x * f64::from(em_layout_width),
                        scroll_position.y * f64::from(line_height),
                    );
                    let indent_guides = self.layout_indent_guides(
                        content_origin,
                        text_hitbox.origin,
                        start_buffer_row..end_buffer_row,
                        preliminary_scroll_pixel_position,
                        line_height,
                        &snapshot,
                        window,
                        cx,
                    );
                    let indent_guides_for_spacers = indent_guides.clone();

                    let blocks = (!is_minimap)
                        .then(|| {
                            window.with_element_namespace("blocks", |window| {
                                self.render_blocks(
                                    start_row..end_row,
                                    &snapshot,
                                    &hitbox,
                                    &text_hitbox,
                                    editor_width,
                                    &mut scroll_width,
                                    &editor_margins,
                                    em_width,
                                    gutter_dimensions.full_width(),
                                    line_height,
                                    &mut line_layouts,
                                    &local_selections,
                                    &selected_buffer_ids,
                                    &latest_selection_anchors,
                                    is_row_soft_wrapped,
                                    sticky_header_excerpt_id,
                                    &indent_guides_for_spacers,
                                    window,
                                    cx,
                                )
                            })
                        })
                        .unwrap_or_default();
                    let RenderBlocksOutput {
                        non_spacer_blocks: mut blocks,
                        mut spacer_blocks,
                        row_block_types,
                        resized_blocks,
                    } = blocks;
                    if let Some(resized_blocks) = resized_blocks {
                        if request_layout.has_remaining_prepaint_depth() {
                            self.editor.update(cx, |editor, cx| {
                                editor.resize_blocks(
                                    resized_blocks,
                                    autoscroll_request.map(|(autoscroll, _)| autoscroll),
                                    cx,
                                )
                            });
                            return self.prepaint(
                                None,
                                _inspector_id,
                                bounds,
                                request_layout,
                                window,
                                cx,
                            );
                        } else {
                            debug_panic!(
                                "dropping block resize because prepaint depth \
                                 limit was reached"
                            );
                        }
                    }

                    let sticky_buffer_header = if self.should_show_buffer_headers() {
                        sticky_header_excerpt.map(|sticky_header_excerpt| {
                            window.with_element_namespace("blocks", |window| {
                                self.layout_sticky_buffer_header(
                                    sticky_header_excerpt,
                                    scroll_position,
                                    line_height,
                                    right_margin,
                                    &snapshot,
                                    &hitbox,
                                    &selected_buffer_ids,
                                    &blocks,
                                    &latest_selection_anchors,
                                    window,
                                    cx,
                                )
                            })
                        })
                    } else {
                        None
                    };

                    let scroll_max: gpui::Point<ScrollPixelOffset> = point(
                        ScrollPixelOffset::from(
                            ((scroll_width - editor_width) / em_layout_width).max(0.0),
                        ),
                        max_scroll_top,
                    );

                    self.editor.update(cx, |editor, cx| {
                        if editor.scroll_manager.clamp_scroll_left(scroll_max.x, cx) {
                            scroll_position.x = scroll_max.x.min(scroll_position.x);
                        }

                        if needs_horizontal_autoscroll.0
                            && let Some(new_scroll_position) = editor.autoscroll_horizontally(
                                start_row,
                                editor_width,
                                scroll_width,
                                em_advance,
                                &line_layouts,
                                autoscroll_request,
                                window,
                                cx,
                            )
                        {
                            scroll_position.x = new_scroll_position.x;
                        }
                    });

                    if !em_layout_width.is_zero() {
                        scroll_position.x = window
                            .pixel_snap_f64(scroll_position.x * f64::from(em_layout_width))
                            / f64::from(em_layout_width);
                    }

                    let scroll_pixel_position = point(
                        scroll_position.x * f64::from(em_layout_width),
                        scroll_position.y * f64::from(line_height),
                    );
                    let sticky_headers = if !is_minimap
                        && is_singleton
                        && EditorSettings::get_global(cx).sticky_scroll.enabled
                    {
                        let relative = self.editor.read(cx).relative_line_numbers(cx);
                        self.layout_sticky_headers(
                            &snapshot,
                            editor_width,
                            is_row_soft_wrapped,
                            line_height,
                            scroll_pixel_position,
                            content_origin,
                            &gutter_dimensions,
                            &gutter_hitbox,
                            &text_hitbox,
                            relative,
                            current_selection_head,
                            window,
                            cx,
                        )
                    } else {
                        None
                    };
                    let indent_guides =
                        if scroll_pixel_position != preliminary_scroll_pixel_position {
                            self.layout_indent_guides(
                                content_origin,
                                text_hitbox.origin,
                                start_buffer_row..end_buffer_row,
                                scroll_pixel_position,
                                line_height,
                                &snapshot,
                                window,
                                cx,
                            )
                        } else {
                            indent_guides
                        };

                    let crease_trailers =
                        window.with_element_namespace("crease_trailers", |window| {
                            self.prepaint_crease_trailers(
                                crease_trailers,
                                &line_layouts,
                                line_height,
                                content_origin,
                                scroll_pixel_position,
                                scroll_position,
                                start_row,
                                em_width,
                                window,
                                cx,
                            )
                        });

                    let (edit_prediction_popover, edit_prediction_popover_origin) = self
                        .editor
                        .update(cx, |editor, cx| {
                            editor.render_edit_prediction_popover(
                                &text_hitbox.bounds,
                                content_origin,
                                right_margin,
                                &snapshot,
                                start_row..end_row,
                                scroll_position.y,
                                scroll_position.y + height_in_lines,
                                &line_layouts,
                                line_height,
                                scroll_position,
                                scroll_pixel_position,
                                newest_selection_head,
                                editor_width,
                                style,
                                window,
                                cx,
                            )
                        })
                        .unzip();

                    let mut inline_diagnostics = self.layout_inline_diagnostics(
                        &line_layouts,
                        &crease_trailers,
                        &row_block_types,
                        content_origin,
                        scroll_position,
                        scroll_pixel_position,
                        edit_prediction_popover_origin,
                        start_row,
                        end_row,
                        line_height,
                        em_width,
                        style,
                        window,
                        cx,
                    );

                    let mut inline_blame_layout = None;
                    let mut inline_code_actions = None;
                    if let Some(newest_selection_head) = newest_selection_head {
                        let display_row = newest_selection_head.row();
                        if (start_row..end_row).contains(&display_row)
                            && !row_block_types.contains_key(&display_row)
                        {
                            inline_code_actions = self.layout_inline_code_actions(
                                newest_selection_head,
                                content_origin,
                                scroll_position,
                                scroll_pixel_position,
                                line_height,
                                &snapshot,
                                window,
                                cx,
                            );

                            let line_ix = display_row.minus(start_row) as usize;
                            if let (Some(row_info), Some(line_layout), Some(crease_trailer)) = (
                                row_infos.get(line_ix),
                                line_layouts.get(line_ix),
                                crease_trailers.get(line_ix),
                            ) {
                                let crease_trailer_layout = crease_trailer.as_ref();
                                if let Some(layout) = self.layout_inline_blame(
                                    display_row,
                                    row_info,
                                    line_layout,
                                    crease_trailer_layout,
                                    em_width,
                                    content_origin,
                                    scroll_position,
                                    scroll_pixel_position,
                                    line_height,
                                    window,
                                    cx,
                                ) {
                                    inline_blame_layout = Some(layout);
                                    // Blame overrides inline diagnostics
                                    inline_diagnostics.remove(&display_row);
                                }
                            } else {
                                log::error!(
                                    "bug: line_ix {} is out of bounds - row_infos.len(): {}, \
                                    line_layouts.len(): {}, \
                                    crease_trailers.len(): {}",
                                    line_ix,
                                    row_infos.len(),
                                    line_layouts.len(),
                                    crease_trailers.len(),
                                );
                            }
                        }
                    }

                    let blamed_display_rows = self.layout_blame_entries(
                        &row_infos,
                        em_width,
                        scroll_position,
                        start_row,
                        line_height,
                        &gutter_hitbox,
                        gutter_dimensions.git_blame_entries_width,
                        window,
                        cx,
                    );

                    let line_elements = self.prepaint_lines(
                        start_row,
                        &mut line_layouts,
                        line_height,
                        scroll_position,
                        scroll_pixel_position,
                        content_origin,
                        window,
                        cx,
                    );

                    window.with_element_namespace("blocks", |window| {
                        self.layout_blocks(
                            &mut blocks,
                            &hitbox,
                            &gutter_hitbox,
                            line_height,
                            scroll_position,
                            scroll_pixel_position,
                            &editor_margins,
                            window,
                            cx,
                        );
                        self.layout_blocks(
                            &mut spacer_blocks,
                            &hitbox,
                            &gutter_hitbox,
                            line_height,
                            scroll_position,
                            scroll_pixel_position,
                            &editor_margins,
                            window,
                            cx,
                        );
                    });

                    let cursors = self.collect_cursors(&snapshot, cx);
                    let visible_row_range = start_row..end_row;
                    let non_visible_cursors = cursors
                        .iter()
                        .any(|c| !visible_row_range.contains(&c.0.row()));

                    let visible_cursors = self.layout_visible_cursors(
                        &snapshot,
                        &selections,
                        &row_block_types,
                        start_row..end_row,
                        &line_layouts,
                        &text_hitbox,
                        content_origin,
                        scroll_position,
                        scroll_pixel_position,
                        line_height,
                        em_width,
                        em_advance,
                        autoscroll_containing_element,
                        &redacted_ranges,
                        window,
                        cx,
                    );
                    let navigation_overlay_paint_commands = self.layout_navigation_overlays(
                        &snapshot,
                        start_row..end_row,
                        &line_layouts,
                        &text_hitbox,
                        content_origin,
                        scroll_position,
                        scroll_pixel_position,
                        line_height,
                        window,
                        cx,
                    );

                    let scrollbars_layout = self.layout_scrollbars(
                        &snapshot,
                        &scrollbar_layout_information,
                        content_offset,
                        scroll_position,
                        non_visible_cursors,
                        right_margin,
                        editor_width,
                        window,
                        cx,
                    );

                    let gutter_settings = EditorSettings::get_global(cx).gutter;

                    let context_menu_layout =
                        if let Some(newest_selection_head) = newest_selection_head {
                            let newest_selection_point =
                                newest_selection_head.to_point(&snapshot.display_snapshot);
                            if (start_row..end_row).contains(&newest_selection_head.row()) {
                                self.layout_cursor_popovers(
                                    line_height,
                                    &text_hitbox,
                                    content_origin,
                                    right_margin,
                                    start_row,
                                    scroll_pixel_position,
                                    &line_layouts,
                                    newest_selection_head,
                                    newest_selection_point,
                                    style,
                                    window,
                                    cx,
                                )
                            } else {
                                None
                            }
                        } else {
                            None
                        };

                    self.layout_gutter_menu(
                        line_height,
                        &text_hitbox,
                        content_origin,
                        right_margin,
                        scroll_pixel_position,
                        gutter_dimensions.width - gutter_dimensions.left_padding,
                        window,
                        cx,
                    );

                    let test_indicators = if gutter_settings.runnables {
                        self.layout_run_indicators(
                            &gutter,
                            &run_indicator_rows,
                            &breakpoint_rows,
                            window,
                            cx,
                        )
                    } else {
                        Vec::new()
                    };

                    let show_bookmarks =
                        snapshot.show_bookmarks.unwrap_or(gutter_settings.bookmarks);

                    let bookmark_rows = self.editor.update(cx, |editor, cx| {
                        let mut rows = editor.active_bookmarks(start_row..end_row, window, cx);
                        rows.retain(|k| !run_indicator_rows.contains(k));
                        rows.retain(|k| !breakpoint_rows.contains_key(k));
                        rows
                    });

                    let bookmarks = if show_bookmarks {
                        self.layout_bookmarks(&gutter, &bookmark_rows, window, cx)
                    } else {
                        Vec::new()
                    };

                    let show_breakpoints = snapshot
                        .show_breakpoints
                        .unwrap_or(gutter_settings.breakpoints);

                    breakpoint_rows.retain(|k, _| !run_indicator_rows.contains(k));
                    let mut breakpoints = if show_breakpoints {
                        self.layout_breakpoints(&gutter, &breakpoint_rows, window, cx)
                    } else {
                        Vec::new()
                    };

                    let gutter_hover_button = self
                        .editor
                        .read(cx)
                        .gutter_hover_button
                        .0
                        .filter(|phantom| phantom.is_active)
                        .map(|phantom| phantom.display_row);

                    if let Some(row) = gutter_hover_button
                        && !breakpoint_rows.contains_key(&row)
                        && !run_indicator_rows.contains(&row)
                        && !bookmark_rows.contains(&row)
                        && (show_bookmarks || show_breakpoints)
                    {
                        let position = snapshot
                            .display_point_to_anchor(DisplayPoint::new(row, 0), Bias::Right);
                        breakpoints.extend(
                            self.layout_gutter_hover_button(&gutter, position, row, window, cx),
                        );
                    }

                    let git_gutter_width = Self::gutter_strip_width(line_height)
                        + gutter_dimensions
                            .git_blame_entries_width
                            .unwrap_or_default();
                    let available_width = gutter_dimensions.left_padding - git_gutter_width;

                    let max_line_number_length = self
                        .editor
                        .read(cx)
                        .buffer()
                        .read(cx)
                        .snapshot(cx)
                        .widest_line_number()
                        .ilog10()
                        + 1;

                    let diff_review_button = self
                        .should_render_diff_review_button(
                            start_row..end_row,
                            &row_infos,
                            &snapshot,
                            cx,
                        )
                        .map(|(display_row, buffer_row)| {
                            let is_wide = max_line_number_length
                                >= EditorSettings::get_global(cx).gutter.min_line_number_digits
                                    as u32
                                && buffer_row.is_some_and(|row| {
                                    (row + 1).ilog10() + 1 == max_line_number_length
                                })
                                || gutter_dimensions.right_padding == px(0.);

                            let button_width = if is_wide {
                                available_width - px(6.)
                            } else {
                                available_width + em_width - px(6.)
                            };

                            let button = self.editor.update(cx, |editor, cx| {
                                editor
                                    .render_diff_review_button(display_row, button_width, cx)
                                    .into_any_element()
                            });
                            gutter.prepaint_button(button, display_row, window, cx)
                        });

                    self.layout_signature_help(
                        &hitbox,
                        content_origin,
                        scroll_pixel_position,
                        newest_selection_head,
                        start_row,
                        &line_layouts,
                        line_height,
                        em_width,
                        context_menu_layout,
                        window,
                        cx,
                    );

                    if !cx.has_active_drag() {
                        self.layout_hover_popovers(
                            &snapshot,
                            &hitbox,
                            start_row..end_row,
                            content_origin,
                            scroll_pixel_position,
                            &line_layouts,
                            line_height,
                            em_width,
                            context_menu_layout,
                            window,
                            cx,
                        );

                        self.layout_blame_popover(&snapshot, &hitbox, line_height, window, cx);
                    }

                    let mouse_context_menu = self.layout_mouse_context_menu(
                        &snapshot,
                        start_row..end_row,
                        content_origin,
                        window,
                        cx,
                    );

                    window.with_element_namespace("crease_toggles", |window| {
                        self.prepaint_crease_toggles(
                            &mut crease_toggles,
                            line_height,
                            &gutter_dimensions,
                            gutter_settings,
                            scroll_position,
                            start_row,
                            &gutter_hitbox,
                            window,
                            cx,
                        )
                    });

                    window.with_element_namespace("expand_toggles", |window| {
                        self.prepaint_expand_toggles(&mut expand_toggles, window, cx)
                    });

                    let wrap_guides = self.layout_wrap_guides(
                        em_advance,
                        scroll_position,
                        content_origin,
                        scrollbars_layout.as_ref(),
                        vertical_scrollbar_width,
                        &hitbox,
                        window,
                        cx,
                    );

                    let minimap = window.with_element_namespace("minimap", |window| {
                        self.layout_minimap(
                            &snapshot,
                            minimap_width,
                            scroll_position,
                            &scrollbar_layout_information,
                            scrollbars_layout.as_ref(),
                            window,
                            cx,
                        )
                    });

                    let invisible_symbol_font_size = font_size / 2.;
                    let whitespace_map = &self
                        .editor
                        .read(cx)
                        .buffer
                        .read(cx)
                        .language_settings(cx)
                        .whitespace_map;

                    let tab_char = whitespace_map.tab.clone();
                    let tab_len = tab_char.len();
                    let tab_invisible = window.text_system().shape_line(
                        tab_char,
                        invisible_symbol_font_size,
                        &[TextRun {
                            len: tab_len,
                            font: self.style.text.font(),
                            color: cx.theme().colors().editor_invisible,
                            ..Default::default()
                        }],
                        None,
                    );

                    let space_char = whitespace_map.space.clone();
                    let space_len = space_char.len();
                    let space_invisible = window.text_system().shape_line(
                        space_char,
                        invisible_symbol_font_size,
                        &[TextRun {
                            len: space_len,
                            font: self.style.text.font(),
                            color: cx.theme().colors().editor_invisible,
                            ..Default::default()
                        }],
                        None,
                    );

                    let mode = snapshot.mode.clone();

                    let sticky_scroll_header_height = sticky_headers
                        .as_ref()
                        .and_then(|headers| headers.lines.last())
                        .map_or(Pixels::ZERO, |last| last.offset + line_height);

                    let has_sticky_buffer_header =
                        sticky_buffer_header.is_some() || sticky_header_excerpt_id.is_some();
                    let sticky_header_height = if has_sticky_buffer_header {
                        let full_height = FILE_HEADER_HEIGHT as f32 * line_height;
                        let display_row = blocks
                            .iter()
                            .filter(|block| block.is_buffer_header)
                            .find_map(|block| {
                                block.row.filter(|row| row.0 > scroll_position.y as u32)
                            });
                        let offset = match display_row {
                            Some(display_row) => {
                                let max_row = display_row.0.saturating_sub(FILE_HEADER_HEIGHT);
                                let offset = (scroll_position.y - max_row as f64).max(0.0);
                                let slide_up =
                                    Pixels::from(offset * ScrollPixelOffset::from(line_height));

                                (full_height - slide_up).max(Pixels::ZERO)
                            }
                            None => full_height,
                        };
                        let header_bottom_padding =
                            BUFFER_HEADER_PADDING.to_pixels(window.rem_size());
                        sticky_scroll_header_height + offset - header_bottom_padding
                    } else {
                        sticky_scroll_header_height
                    };

                    let (diff_hunk_controls, diff_hunk_control_bounds) =
                        if is_read_only && !self.editor.read(cx).delegate_stage_and_restore {
                            (vec![], vec![])
                        } else {
                            self.layout_diff_hunk_controls(
                                start_row..end_row,
                                &row_infos,
                                &text_hitbox,
                                current_selection_head,
                                line_height,
                                right_margin,
                                scroll_pixel_position,
                                sticky_header_height,
                                &display_hunks,
                                &highlighted_rows,
                                self.editor.clone(),
                                window,
                                cx,
                            )
                        };

                    let position_map = Rc::new(PositionMap {
                        size: bounds.size,
                        visible_row_range,
                        scroll_position,
                        scroll_pixel_position,
                        scroll_max,
                        line_layouts,
                        line_height,
                        em_advance,
                        em_layout_width,
                        snapshot,
                        text_align: self.style.text.text_align,
                        content_width: text_hitbox.size.width,
                        gutter_hitbox: gutter_hitbox.clone(),
                        text_hitbox: text_hitbox.clone(),
                        inline_blame_bounds: inline_blame_layout
                            .as_ref()
                            .map(|layout| (layout.bounds, layout.buffer_id, layout.entry.clone())),
                        display_hunks: display_hunks.clone(),
                        diff_hunk_control_bounds,
                    });

                    self.editor.update(cx, |editor, _| {
                        editor.last_position_map = Some(position_map.clone())
                    });

                    EditorLayout {
                        mode,
                        position_map,
                        visible_display_row_range: start_row..end_row,
                        wrap_guides,
                        indent_guides,
                        hitbox,
                        gutter_hitbox,
                        display_hunks,
                        content_origin,
                        scrollbars_layout,
                        minimap,
                        active_rows,
                        highlighted_rows,
                        highlighted_ranges,
                        highlighted_gutter_ranges,
                        redacted_ranges,
                        document_colors,
                        line_elements,
                        line_numbers,
                        blamed_display_rows,
                        inline_diagnostics,
                        inline_blame_layout,
                        inline_code_actions,
                        blocks,
                        spacer_blocks,
                        cursors,
                        visible_cursors,
                        navigation_overlay_paint_commands,
                        selections,
                        edit_prediction_popover,
                        diff_hunk_controls,
                        mouse_context_menu,
                        test_indicators,
                        bookmarks,
                        breakpoints,
                        diff_review_button,
                        crease_toggles,
                        crease_trailers,
                        tab_invisible,
                        space_invisible,
                        sticky_buffer_header,
                        sticky_headers,
                        expand_toggles,
                        text_align: self.style.text.text_align,
                        content_width: text_hitbox.size.width,
                    }
                })
            })
        })
    }

    fn paint(
        &mut self,
        _: Option<&GlobalElementId>,
        _inspector_id: Option<&gpui::InspectorElementId>,
        bounds: Bounds<gpui::Pixels>,
        _: &mut Self::RequestLayoutState,
        layout: &mut Self::PrepaintState,
        window: &mut Window,
        cx: &mut App,
    ) {
        if !layout.mode.is_minimap() {
            let focus_handle = self.editor.focus_handle(cx);
            let key_context = self
                .editor
                .update(cx, |editor, cx| editor.key_context(window, cx));

            window.set_key_context(key_context);
            window.handle_input(
                &focus_handle,
                ElementInputHandler::new(bounds, self.editor.clone()),
                cx,
            );
            self.register_actions(window, cx);
            self.register_key_listeners(window, cx, layout);
        }

        let text_style = TextStyleRefinement {
            font_size: Some(self.style.text.font_size),
            line_height: Some(self.style.text.line_height),
            ..Default::default()
        };
        let rem_size = self.rem_size(cx);
        window.with_rem_size(rem_size, |window| {
            window.with_text_style(Some(text_style), |window| {
                window.with_content_mask(Some(ContentMask { bounds }), |window| {
                    self.paint_mouse_listeners(layout, window, cx);

                    // Mask the editor behind sticky scroll headers. Important
                    // for transparent backgrounds.
                    let below_sticky_headers_mask = layout
                        .sticky_headers
                        .as_ref()
                        .and_then(|h| h.lines.last())
                        .map(|last| ContentMask {
                            bounds: Bounds {
                                origin: point(
                                    bounds.origin.x,
                                    bounds.origin.y + last.offset + layout.position_map.line_height,
                                ),
                                size: size(
                                    bounds.size.width,
                                    (bounds.size.height
                                        - last.offset
                                        - layout.position_map.line_height)
                                        .max(Pixels::ZERO),
                                ),
                            },
                        });

                    window.with_content_mask(below_sticky_headers_mask, |window| {
                        self.paint_background(layout, window, cx);

                        self.paint_indent_guides(layout, window, cx);

                        if layout.gutter_hitbox.size.width > Pixels::ZERO {
                            self.paint_blamed_display_rows(layout, window, cx);
                            self.paint_line_numbers(layout, window, cx);
                        }

                        self.paint_text(layout, window, cx);

                        if !layout.spacer_blocks.is_empty() {
                            window.with_element_namespace("blocks", |window| {
                                self.paint_spacer_blocks(layout, window, cx);
                            });
                        }

                        if layout.gutter_hitbox.size.width > Pixels::ZERO {
                            self.paint_gutter_highlights(layout, window, cx);
                            self.paint_gutter_indicators(layout, window, cx);
                        }

                        if !layout.blocks.is_empty() {
                            window.with_element_namespace("blocks", |window| {
                                self.paint_non_spacer_blocks(layout, window, cx);
                            });
                        }
                    });

                    window.with_element_namespace("blocks", |window| {
                        if let Some(mut sticky_header) = layout.sticky_buffer_header.take() {
                            sticky_header.paint(window, cx)
                        }
                    });

                    self.paint_sticky_headers(layout, window, cx);
                    self.paint_minimap(layout, window, cx);
                    self.paint_scrollbars(layout, window, cx);
                    self.paint_edit_prediction_popover(layout, window, cx);
                    self.paint_mouse_context_menu(layout, window, cx);
                });
            })
        })
    }
}

pub(super) fn gutter_bounds(
    editor_bounds: Bounds<Pixels>,
    gutter_dimensions: GutterDimensions,
) -> Bounds<Pixels> {
    Bounds {
        origin: editor_bounds.origin,
        size: size(gutter_dimensions.width, editor_bounds.size.height),
    }
}

#[derive(Clone, Copy)]
struct ContextMenuLayout {
    y_flipped: bool,
    bounds: Bounds<Pixels>,
}

/// Holds information required for layouting the editor scrollbars.
struct ScrollbarLayoutInformation {
    /// The bounds of the editor area (excluding the content offset).
    editor_bounds: Bounds<Pixels>,
    /// The available range to scroll within the document.
    scroll_range: Size<Pixels>,
    /// The space available for one glyph in the editor.
    glyph_grid_cell: Size<Pixels>,
}

impl ScrollbarLayoutInformation {
    pub fn new(
        editor_bounds: Bounds<Pixels>,
        glyph_grid_cell: Size<Pixels>,
        document_size: Size<Pixels>,
        longest_line_blame_width: Pixels,
        settings: &EditorSettings,
        scroll_beyond_last_line: ScrollBeyondLastLine,
    ) -> Self {
        let vertical_overscroll = match scroll_beyond_last_line {
            ScrollBeyondLastLine::OnePage => editor_bounds.size.height,
            ScrollBeyondLastLine::Off => glyph_grid_cell.height,
            ScrollBeyondLastLine::VerticalScrollMargin => {
                (1.0 + settings.vertical_scroll_margin) as f32 * glyph_grid_cell.height
            }
        };

        let overscroll = size(longest_line_blame_width, vertical_overscroll);

        ScrollbarLayoutInformation {
            editor_bounds,
            scroll_range: document_size + overscroll,
            glyph_grid_cell,
        }
    }
}

impl IntoElement for EditorElement {
    type Element = Self;

    fn into_element(self) -> Self::Element {
        self
    }
}

pub struct EditorLayout {
    position_map: Rc<PositionMap>,
    hitbox: Hitbox,
    gutter_hitbox: Hitbox,
    content_origin: gpui::Point<Pixels>,
    scrollbars_layout: Option<EditorScrollbars>,
    minimap: Option<MinimapLayout>,
    mode: EditorMode,
    wrap_guides: SmallVec<[(Pixels, bool); 2]>,
    indent_guides: Option<Vec<IndentGuideLayout>>,
    visible_display_row_range: Range<DisplayRow>,
    active_rows: BTreeMap<DisplayRow, LineHighlightSpec>,
    highlighted_rows: BTreeMap<DisplayRow, LineHighlight>,
    line_elements: SmallVec<[AnyElement; 1]>,
    line_numbers: Arc<HashMap<MultiBufferRow, LineNumberLayout>>,
    display_hunks: Vec<(DisplayDiffHunk, Option<Hitbox>)>,
    blamed_display_rows: Option<Vec<AnyElement>>,
    inline_diagnostics: HashMap<DisplayRow, AnyElement>,
    inline_blame_layout: Option<InlineBlameLayout>,
    inline_code_actions: Option<AnyElement>,
    blocks: Vec<BlockLayout>,
    spacer_blocks: Vec<BlockLayout>,
    highlighted_ranges: Vec<(Range<DisplayPoint>, Hsla)>,
    highlighted_gutter_ranges: Vec<(Range<DisplayPoint>, Hsla)>,
    redacted_ranges: Vec<Range<DisplayPoint>>,
    cursors: Vec<(DisplayPoint, Hsla)>,
    visible_cursors: Vec<CursorLayout>,
    navigation_overlay_paint_commands: Vec<NavigationOverlayPaintCommand>,
    selections: Vec<(PlayerColor, Vec<SelectionLayout>)>,
    test_indicators: Vec<AnyElement>,
    bookmarks: Vec<AnyElement>,
    breakpoints: Vec<AnyElement>,
    diff_review_button: Option<AnyElement>,
    crease_toggles: Vec<Option<AnyElement>>,
    expand_toggles: Vec<Option<(AnyElement, gpui::Point<Pixels>)>>,
    diff_hunk_controls: Vec<AnyElement>,
    crease_trailers: Vec<Option<CreaseTrailerLayout>>,
    edit_prediction_popover: Option<AnyElement>,
    mouse_context_menu: Option<AnyElement>,
    tab_invisible: ShapedLine,
    space_invisible: ShapedLine,
    sticky_buffer_header: Option<AnyElement>,
    sticky_headers: Option<header::StickyHeaders>,
    document_colors: Option<(DocumentColorsRenderMode, Vec<(Range<DisplayPoint>, Hsla)>)>,
    text_align: TextAlign,
    content_width: Pixels,
}

impl EditorLayout {
    fn line_end_overshoot(&self) -> Pixels {
        0.15 * self.position_map.line_height
    }
}

#[derive(Debug)]
struct LineNumberSegment {
    shaped_line: ShapedLine,
    hitbox: Option<Hitbox>,
}

#[derive(Debug)]
struct LineNumberLayout {
    segments: SmallVec<[LineNumberSegment; 1]>,
}

struct ColoredRange<T> {
    start: T,
    end: T,
    color: Hsla,
}

impl Along for ScrollbarAxes {
    type Unit = bool;

    fn along(&self, axis: ScrollbarAxis) -> Self::Unit {
        match axis {
            ScrollbarAxis::Horizontal => self.horizontal,
            ScrollbarAxis::Vertical => self.vertical,
        }
    }

    fn apply_along(&self, axis: ScrollbarAxis, f: impl FnOnce(Self::Unit) -> Self::Unit) -> Self {
        match axis {
            ScrollbarAxis::Horizontal => ScrollbarAxes {
                horizontal: f(self.horizontal),
                vertical: self.vertical,
            },
            ScrollbarAxis::Vertical => ScrollbarAxes {
                horizontal: self.horizontal,
                vertical: f(self.vertical),
            },
        }
    }
}

#[derive(Clone)]
struct EditorScrollbars {
    pub vertical: Option<ScrollbarLayout>,
    pub horizontal: Option<ScrollbarLayout>,
    pub visible: bool,
}

impl EditorScrollbars {
    pub fn from_scrollbar_axes(
        show_scrollbar: ScrollbarAxes,
        layout_information: &ScrollbarLayoutInformation,
        content_offset: gpui::Point<Pixels>,
        scroll_position: gpui::Point<f64>,
        scrollbar_width: Pixels,
        right_margin: Pixels,
        editor_width: Pixels,
        show_scrollbars: bool,
        scrollbar_state: Option<&ActiveScrollbarState>,
        window: &mut Window,
    ) -> Self {
        let ScrollbarLayoutInformation {
            editor_bounds,
            scroll_range,
            glyph_grid_cell,
        } = layout_information;

        let viewport_size = size(editor_width, editor_bounds.size.height);

        let scrollbar_bounds_for = |axis: ScrollbarAxis| match axis {
            ScrollbarAxis::Horizontal => Bounds::from_anchor_and_size(
                gpui::Anchor::BottomLeft,
                editor_bounds.bottom_left(),
                size(
                    // The horizontal viewport size differs from the space available for the
                    // horizontal scrollbar, so we have to manually stitch it together here.
                    editor_bounds.size.width - right_margin,
                    scrollbar_width,
                ),
            ),
            ScrollbarAxis::Vertical => Bounds::from_anchor_and_size(
                gpui::Anchor::TopRight,
                editor_bounds.top_right(),
                size(scrollbar_width, viewport_size.height),
            ),
        };

        let mut create_scrollbar_layout = |axis| {
            let viewport_size = viewport_size.along(axis);
            let scroll_range = scroll_range.along(axis);

            // We always want a vertical scrollbar track for scrollbar diagnostic visibility.
            (show_scrollbar.along(axis)
                && (axis == ScrollbarAxis::Vertical || scroll_range > viewport_size))
                .then(|| {
                    ScrollbarLayout::new(
                        window.insert_hitbox(scrollbar_bounds_for(axis), HitboxBehavior::Normal),
                        viewport_size,
                        scroll_range,
                        glyph_grid_cell.along(axis),
                        content_offset.along(axis),
                        scroll_position.along(axis),
                        show_scrollbars,
                        axis,
                    )
                    .with_thumb_state(
                        scrollbar_state.and_then(|state| state.thumb_state_for_axis(axis)),
                    )
                })
        };

        Self {
            vertical: create_scrollbar_layout(ScrollbarAxis::Vertical),
            horizontal: create_scrollbar_layout(ScrollbarAxis::Horizontal),
            visible: show_scrollbars,
        }
    }

    pub fn iter_scrollbars(&self) -> impl Iterator<Item = (&ScrollbarLayout, ScrollbarAxis)> + '_ {
        [
            (&self.vertical, ScrollbarAxis::Vertical),
            (&self.horizontal, ScrollbarAxis::Horizontal),
        ]
        .into_iter()
        .filter_map(|(scrollbar, axis)| scrollbar.as_ref().map(|s| (s, axis)))
    }

    /// Returns the currently hovered scrollbar axis, if any.
    pub fn get_hovered_axis(&self, window: &Window) -> Option<(&ScrollbarLayout, ScrollbarAxis)> {
        self.iter_scrollbars()
            .find(|s| s.0.hitbox.is_hovered(window))
    }
}

#[derive(Clone)]
struct ScrollbarLayout {
    hitbox: Hitbox,
    visible_range: Range<ScrollOffset>,
    text_unit_size: Pixels,
    thumb_bounds: Option<Bounds<Pixels>>,
    thumb_state: ScrollbarThumbState,
}

impl ScrollbarLayout {
    const BORDER_WIDTH: Pixels = px(1.0);
    const LINE_MARKER_HEIGHT: Pixels = px(2.0);
    const MIN_MARKER_HEIGHT: Pixels = px(5.0);
    const MIN_THUMB_SIZE: Pixels = px(25.0);

    fn new(
        scrollbar_track_hitbox: Hitbox,
        viewport_size: Pixels,
        scroll_range: Pixels,
        glyph_space: Pixels,
        content_offset: Pixels,
        scroll_position: ScrollOffset,
        show_thumb: bool,
        axis: ScrollbarAxis,
    ) -> Self {
        let track_bounds = scrollbar_track_hitbox.bounds;
        // The length of the track available to the scrollbar thumb. We deliberately
        // exclude the content size here so that the thumb aligns with the content.
        let track_length = track_bounds.size.along(axis) - content_offset;

        Self::new_with_hitbox_and_track_length(
            scrollbar_track_hitbox,
            track_length,
            viewport_size,
            scroll_range.into(),
            glyph_space,
            content_offset.into(),
            scroll_position,
            show_thumb,
            axis,
        )
    }

    fn for_minimap(
        minimap_track_hitbox: Hitbox,
        visible_lines: f64,
        total_editor_lines: f64,
        minimap_line_height: Pixels,
        scroll_position: ScrollOffset,
        minimap_scroll_top: ScrollOffset,
        show_thumb: bool,
    ) -> Self {
        // The scrollbar thumb size is calculated as
        // (visible_content/total_content) × scrollbar_track_length.
        //
        // For the minimap's thumb layout, we leverage this by setting the
        // scrollbar track length to the entire document size (using minimap line
        // height). This creates a thumb that exactly represents the editor
        // viewport scaled to minimap proportions.
        //
        // We adjust the thumb position relative to `minimap_scroll_top` to
        // accommodate for the deliberately oversized track.
        //
        // This approach ensures that the minimap thumb accurately reflects the
        // editor's current scroll position whilst nicely synchronizing the minimap
        // thumb and scrollbar thumb.
        let scroll_range = total_editor_lines * f64::from(minimap_line_height);
        let viewport_size = visible_lines * f64::from(minimap_line_height);

        let track_top_offset = -minimap_scroll_top * f64::from(minimap_line_height);

        Self::new_with_hitbox_and_track_length(
            minimap_track_hitbox,
            Pixels::from(scroll_range),
            Pixels::from(viewport_size),
            scroll_range,
            minimap_line_height,
            track_top_offset,
            scroll_position,
            show_thumb,
            ScrollbarAxis::Vertical,
        )
    }

    fn new_with_hitbox_and_track_length(
        scrollbar_track_hitbox: Hitbox,
        track_length: Pixels,
        viewport_size: Pixels,
        scroll_range: f64,
        glyph_space: Pixels,
        content_offset: ScrollOffset,
        scroll_position: ScrollOffset,
        show_thumb: bool,
        axis: ScrollbarAxis,
    ) -> Self {
        let text_units_per_page = viewport_size.to_f64() / glyph_space.to_f64();
        let visible_range = scroll_position..scroll_position + text_units_per_page;
        let total_text_units = scroll_range / glyph_space.to_f64();

        let thumb_percentage = text_units_per_page / total_text_units;
        let thumb_size = Pixels::from(ScrollOffset::from(track_length) * thumb_percentage)
            .max(ScrollbarLayout::MIN_THUMB_SIZE)
            .min(track_length);

        let text_unit_divisor = (total_text_units - text_units_per_page).max(0.);

        let content_larger_than_viewport = text_unit_divisor > 0.;

        let text_unit_size = if content_larger_than_viewport {
            Pixels::from(ScrollOffset::from(track_length - thumb_size) / text_unit_divisor)
        } else {
            glyph_space
        };

        let thumb_bounds = (show_thumb && content_larger_than_viewport).then(|| {
            Self::thumb_bounds(
                &scrollbar_track_hitbox,
                content_offset,
                visible_range.start,
                text_unit_size,
                thumb_size,
                axis,
            )
        });

        ScrollbarLayout {
            hitbox: scrollbar_track_hitbox,
            visible_range,
            text_unit_size,
            thumb_bounds,
            thumb_state: Default::default(),
        }
    }

    fn with_thumb_state(self, thumb_state: Option<ScrollbarThumbState>) -> Self {
        if let Some(thumb_state) = thumb_state {
            Self {
                thumb_state,
                ..self
            }
        } else {
            self
        }
    }

    fn thumb_bounds(
        scrollbar_track: &Hitbox,
        content_offset: f64,
        visible_range_start: f64,
        text_unit_size: Pixels,
        thumb_size: Pixels,
        axis: ScrollbarAxis,
    ) -> Bounds<Pixels> {
        let thumb_origin = scrollbar_track.origin.apply_along(axis, |origin| {
            origin
                + Pixels::from(
                    content_offset + visible_range_start * ScrollOffset::from(text_unit_size),
                )
        });
        Bounds::new(
            thumb_origin,
            scrollbar_track.size.apply_along(axis, |_| thumb_size),
        )
    }

    fn thumb_hovered(&self, position: &gpui::Point<Pixels>) -> bool {
        self.thumb_bounds
            .is_some_and(|bounds| bounds.contains(position))
    }

    fn marker_quads_for_ranges(
        &self,
        row_ranges: impl IntoIterator<Item = ColoredRange<DisplayRow>>,
        column: Option<usize>,
    ) -> Vec<PaintQuad> {
        struct MinMax {
            min: Pixels,
            max: Pixels,
        }
        let (x_range, height_limit) = if let Some(column) = column {
            let column_width = ((self.hitbox.size.width - Self::BORDER_WIDTH) / 3.0).floor();
            let start = Self::BORDER_WIDTH + (column as f32 * column_width);
            let end = start + column_width;
            (
                Range { start, end },
                MinMax {
                    min: Self::MIN_MARKER_HEIGHT,
                    max: px(f32::MAX),
                },
            )
        } else {
            (
                Range {
                    start: Self::BORDER_WIDTH,
                    end: self.hitbox.size.width,
                },
                MinMax {
                    min: Self::LINE_MARKER_HEIGHT,
                    max: Self::LINE_MARKER_HEIGHT,
                },
            )
        };

        let row_to_y = |row: DisplayRow| row.as_f64() as f32 * self.text_unit_size;
        let mut pixel_ranges = row_ranges
            .into_iter()
            .map(|range| {
                let start_y = row_to_y(range.start);
                let end_y = row_to_y(range.end)
                    + self
                        .text_unit_size
                        .max(height_limit.min)
                        .min(height_limit.max);
                ColoredRange {
                    start: start_y,
                    end: end_y,
                    color: range.color,
                }
            })
            .peekable();

        let mut quads = Vec::new();
        while let Some(mut pixel_range) = pixel_ranges.next() {
            while let Some(next_pixel_range) = pixel_ranges.peek() {
                if pixel_range.end >= next_pixel_range.start - px(1.0)
                    && pixel_range.color == next_pixel_range.color
                {
                    pixel_range.end = next_pixel_range.end.max(pixel_range.end);
                    pixel_ranges.next();
                } else {
                    break;
                }
            }

            let bounds = Bounds::from_corners(
                point(x_range.start, pixel_range.start),
                point(x_range.end, pixel_range.end),
            );
            quads.push(quad(
                bounds,
                Corners::default(),
                pixel_range.color,
                Edges::default(),
                Hsla::transparent_black(),
                BorderStyle::default(),
            ));
        }

        quads
    }
}

struct MinimapLayout {
    pub minimap: AnyElement,
    pub thumb_layout: ScrollbarLayout,
    pub minimap_scroll_top: ScrollOffset,
    pub minimap_line_height: Pixels,
    pub thumb_border_style: MinimapThumbBorder,
    pub max_scroll_top: ScrollOffset,
}

impl MinimapLayout {
    /// The minimum width of the minimap in columns. If the minimap is smaller than this, it will be hidden.
    const MINIMAP_MIN_WIDTH_COLUMNS: f32 = 20.;
    /// The minimap width as a percentage of the editor width.
    const MINIMAP_WIDTH_PCT: f32 = 0.15;
    /// Calculates the scroll top offset the minimap editor has to have based on the
    /// current scroll progress.
    fn calculate_minimap_top_offset(
        document_lines: f64,
        visible_editor_lines: f64,
        visible_minimap_lines: f64,
        scroll_position: f64,
    ) -> ScrollOffset {
        let non_visible_document_lines = (document_lines - visible_editor_lines).max(0.);
        if non_visible_document_lines == 0. {
            0.
        } else {
            let scroll_percentage = (scroll_position / non_visible_document_lines).clamp(0., 1.);
            scroll_percentage * (document_lines - visible_minimap_lines).max(0.)
        }
    }
}

struct CreaseTrailerLayout {
    element: AnyElement,
    bounds: Bounds<Pixels>,
}

pub(crate) struct PositionMap {
    pub size: Size<Pixels>,
    pub line_height: Pixels,
    pub scroll_position: gpui::Point<ScrollOffset>,
    pub scroll_pixel_position: gpui::Point<ScrollPixelOffset>,
    pub scroll_max: gpui::Point<ScrollOffset>,
    pub em_advance: Pixels,
    pub em_layout_width: Pixels,
    pub visible_row_range: Range<DisplayRow>,
    pub line_layouts: Vec<LineWithInvisibles>,
    pub snapshot: EditorSnapshot,
    pub text_align: TextAlign,
    pub content_width: Pixels,
    pub text_hitbox: Hitbox,
    pub gutter_hitbox: Hitbox,
    pub inline_blame_bounds: Option<(Bounds<Pixels>, BufferId, BlameEntry)>,
    pub display_hunks: Vec<(DisplayDiffHunk, Option<Hitbox>)>,
    pub diff_hunk_control_bounds: Vec<(DisplayRow, Bounds<Pixels>)>,
}

#[derive(Debug, Copy, Clone)]
pub struct PointForPosition {
    pub previous_valid: DisplayPoint,
    pub next_valid: DisplayPoint,
    pub nearest_valid: DisplayPoint,
    pub exact_unclipped: DisplayPoint,
    pub column_overshoot_after_line_end: u32,
}

impl PointForPosition {
    pub fn as_valid(&self) -> Option<DisplayPoint> {
        if self.previous_valid == self.exact_unclipped && self.next_valid == self.exact_unclipped {
            Some(self.previous_valid)
        } else {
            None
        }
    }

    pub fn intersects_selection(&self, selection: &Selection<DisplayPoint>) -> bool {
        let Some(valid_point) = self.as_valid() else {
            return false;
        };
        let range = selection.range();

        let candidate_row = valid_point.row();
        let candidate_col = valid_point.column();

        let start_row = range.start.row();
        let start_col = range.start.column();
        let end_row = range.end.row();
        let end_col = range.end.column();

        if candidate_row < start_row || candidate_row > end_row {
            false
        } else if start_row == end_row {
            candidate_col >= start_col && candidate_col < end_col
        } else if candidate_row == start_row {
            candidate_col >= start_col
        } else if candidate_row == end_row {
            candidate_col < end_col
        } else {
            true
        }
    }
}

impl PositionMap {
    pub(crate) fn point_for_position(&self, position: gpui::Point<Pixels>) -> PointForPosition {
        let text_bounds = self.text_hitbox.bounds;
        let scroll_position = self.scroll_position;
        let position = position - text_bounds.origin;
        let y = position.y.max(px(0.)).min(self.size.height);
        let x = position.x + (scroll_position.x as f32 * self.em_layout_width);
        let row = ((y / self.line_height) as f64 + scroll_position.y) as u32;

        let (column, x_overshoot_after_line_end) = if let Some(line_index) =
            row.checked_sub(self.visible_row_range.start.0)
            && let Some(line) = self.line_layouts.get(line_index as usize)
        {
            let alignment_offset = line.alignment_offset(self.text_align, self.content_width);
            let x_relative_to_text = x - alignment_offset;
            if let Some(ix) = line.index_for_x(x_relative_to_text) {
                (ix as u32, px(0.))
            } else {
                (line.len as u32, px(0.).max(x_relative_to_text - line.width))
            }
        } else {
            (0, x)
        };

        let mut exact_unclipped = DisplayPoint::new(DisplayRow(row), column);
        let previous_valid = self.snapshot.clip_point(exact_unclipped, Bias::Left);
        let next_valid = self.snapshot.clip_point(exact_unclipped, Bias::Right);

        let nearest_valid = if previous_valid == next_valid {
            previous_valid
        } else {
            match self.snapshot.inlay_bias_at(exact_unclipped) {
                Some(Bias::Left) => next_valid,
                Some(Bias::Right) => previous_valid,
                None => previous_valid,
            }
        };

        let column_overshoot_after_line_end =
            (x_overshoot_after_line_end / self.em_layout_width) as u32;
        *exact_unclipped.column_mut() += column_overshoot_after_line_end;
        PointForPosition {
            previous_valid,
            next_valid,
            nearest_valid,
            exact_unclipped,
            column_overshoot_after_line_end,
        }
    }

    fn point_for_position_on_line(
        &self,
        position: gpui::Point<Pixels>,
        row: DisplayRow,
        line: &LineWithInvisibles,
    ) -> PointForPosition {
        let text_bounds = self.text_hitbox.bounds;
        let scroll_position = self.scroll_position;
        let position = position - text_bounds.origin;
        let x = position.x + (scroll_position.x as f32 * self.em_layout_width);

        let alignment_offset = line.alignment_offset(self.text_align, self.content_width);
        let x_relative_to_text = x - alignment_offset;
        let (column, x_overshoot_after_line_end) =
            if let Some(ix) = line.index_for_x(x_relative_to_text) {
                (ix as u32, px(0.))
            } else {
                (line.len as u32, px(0.).max(x_relative_to_text - line.width))
            };

        let mut exact_unclipped = DisplayPoint::new(row, column);
        let previous_valid = self.snapshot.clip_point(exact_unclipped, Bias::Left);
        let next_valid = self.snapshot.clip_point(exact_unclipped, Bias::Right);

        let nearest_valid = if previous_valid == next_valid {
            previous_valid
        } else {
            match self.snapshot.inlay_bias_at(exact_unclipped) {
                Some(Bias::Left) => next_valid,
                Some(Bias::Right) => previous_valid,
                None => previous_valid,
            }
        };

        let column_overshoot_after_line_end =
            (x_overshoot_after_line_end / self.em_layout_width) as u32;
        *exact_unclipped.column_mut() += column_overshoot_after_line_end;
        PointForPosition {
            previous_valid,
            next_valid,
            nearest_valid,
            exact_unclipped,
            column_overshoot_after_line_end,
        }
    }
}

pub(crate) struct BlockLayout {
    pub(crate) id: BlockId,
    pub(crate) x_offset: Pixels,
    pub(crate) row: Option<DisplayRow>,
    pub(crate) element: AnyElement,
    pub(crate) available_space: Size<AvailableSpace>,
    pub(crate) style: BlockStyle,
    pub(crate) overlaps_gutter: bool,
    pub(crate) is_buffer_header: bool,
}

pub fn layout_line(
    row: DisplayRow,
    snapshot: &EditorSnapshot,
    style: &EditorStyle,
    text_width: Pixels,
    is_row_soft_wrapped: impl Copy + Fn(usize) -> bool,
    window: &mut Window,
    cx: &mut App,
) -> LineWithInvisibles {
    let use_tree_sitter =
        !snapshot.semantic_tokens_enabled || snapshot.use_tree_sitter_for_syntax(row, cx);
    let language_aware = LanguageAwareStyling {
        tree_sitter: use_tree_sitter,
        diagnostics: true,
    };
    let chunks = snapshot.highlighted_chunks(row..row + DisplayRow(1), language_aware, style);
    LineWithInvisibles::from_chunks(
        chunks,
        style,
        MAX_LINE_LEN,
        1,
        &snapshot.mode,
        text_width,
        is_row_soft_wrapped,
        &[],
        window,
        cx,
    )
    .pop()
    .unwrap()
}

#[derive(Debug, Clone)]
pub struct IndentGuideLayout {
    origin: gpui::Point<Pixels>,
    length: Pixels,
    single_indent_width: Pixels,
    display_row_range: Range<DisplayRow>,
    depth: u32,
    active: bool,
    settings: IndentGuideSettings,
}

enum NavigationOverlayPaintCommand {
    Label(NavigationLabelLayout),
}

struct NavigationLabelLayout {
    element: AnyElement,
    #[cfg_attr(not(test), allow(dead_code))]
    origin: gpui::Point<Pixels>,
}

struct NavigationOverlayLayoutContext<'a> {
    display_snapshot: &'a DisplaySnapshot,
    visible_display_row_range: &'a Range<DisplayRow>,
    line_layouts: &'a [LineWithInvisibles],
    text_align: TextAlign,
    content_width: Pixels,
    content_origin: gpui::Point<Pixels>,
    scroll_position: gpui::Point<ScrollOffset>,
    scroll_pixel_position: gpui::Point<ScrollPixelOffset>,
    line_height: Pixels,
    editor_font: Font,
    editor_font_size: Pixels,
}

const LABEL_LINE_HEIGHT_PADDING_PX: f32 = 2.0;

pub struct CursorLayout {
    origin: gpui::Point<Pixels>,
    block_width: Pixels,
    line_height: Pixels,
    color: Hsla,
    shape: CursorShape,
    block_text: Option<ShapedLine>,
    cursor_name: Option<AnyElement>,
}

#[derive(Debug)]
pub struct CursorName {
    string: SharedString,
    color: Hsla,
    is_top_row: bool,
}

impl CursorLayout {
    pub fn new(
        origin: gpui::Point<Pixels>,
        block_width: Pixels,
        line_height: Pixels,
        color: Hsla,
        shape: CursorShape,
        block_text: Option<ShapedLine>,
    ) -> CursorLayout {
        CursorLayout {
            origin,
            block_width,
            line_height,
            color,
            shape,
            block_text,
            cursor_name: None,
        }
    }

    pub fn bounding_rect(&self, origin: gpui::Point<Pixels>) -> Bounds<Pixels> {
        Bounds {
            origin: self.origin + origin,
            size: size(self.block_width, self.line_height),
        }
    }

    fn bounds(&self, origin: gpui::Point<Pixels>) -> Bounds<Pixels> {
        match self.shape {
            CursorShape::Bar => Bounds {
                origin: self.origin + origin,
                size: size(px(2.0), self.line_height),
            },
            CursorShape::Block | CursorShape::Hollow => Bounds {
                origin: self.origin + origin,
                size: size(self.block_width, self.line_height),
            },
            CursorShape::Underline => Bounds {
                origin: self.origin
                    + origin
                    + gpui::Point::new(Pixels::ZERO, self.line_height - px(2.0)),
                size: size(self.block_width, px(2.0)),
            },
        }
    }

    pub fn layout(
        &mut self,
        origin: gpui::Point<Pixels>,
        cursor_name: Option<CursorName>,
        window: &mut Window,
        cx: &mut App,
    ) {
        if let Some(cursor_name) = cursor_name {
            let bounds = self.bounds(origin);
            let text_size = self.line_height / 1.5;

            let name_origin = if cursor_name.is_top_row {
                point(bounds.right() - px(1.), bounds.top())
            } else {
                match self.shape {
                    CursorShape::Bar => point(
                        bounds.right() - px(2.),
                        bounds.top() - text_size / 2. - px(1.),
                    ),
                    _ => point(
                        bounds.right() - px(1.),
                        bounds.top() - text_size / 2. - px(1.),
                    ),
                }
            };
            let mut name_element = div()
                .bg(self.color)
                .text_size(text_size)
                .px_0p5()
                .line_height(text_size + px(LABEL_LINE_HEIGHT_PADDING_PX))
                .text_color(cursor_name.color)
                .child(cursor_name.string)
                .into_any_element();

            name_element.prepaint_as_root(name_origin, AvailableSpace::min_size(), window, cx);

            self.cursor_name = Some(name_element);
        }
    }

    pub fn paint(&mut self, origin: gpui::Point<Pixels>, window: &mut Window, cx: &mut App) {
        let bounds = window.pixel_snap_bounds(self.bounds(origin));

        //Draw background or border quad
        let cursor = if matches!(self.shape, CursorShape::Hollow) {
            outline(bounds, self.color, BorderStyle::Solid)
        } else {
            fill(bounds, self.color)
        };

        if let Some(name) = &mut self.cursor_name {
            name.paint(window, cx);
        }

        window.paint_quad(cursor);

        if let Some(block_text) = &self.block_text {
            block_text
                .paint(
                    self.origin + origin,
                    self.line_height,
                    TextAlign::Left,
                    None,
                    window,
                    cx,
                )
                .log_err();
        }
    }

    pub fn shape(&self) -> CursorShape {
        self.shape
    }
}

#[derive(Debug)]
pub struct HighlightedRange {
    pub start_y: Pixels,
    pub line_height: Pixels,
    pub lines: Vec<HighlightedRangeLine>,
    pub color: Hsla,
    pub corner_radius: Pixels,
}

#[derive(Debug)]
pub struct HighlightedRangeLine {
    pub start_x: Pixels,
    pub end_x: Pixels,
}

impl HighlightedRange {
    pub fn paint(&self, fill: bool, bounds: Bounds<Pixels>, window: &mut Window) {
        if self.lines.len() >= 2 && self.lines[0].start_x > self.lines[1].end_x {
            self.paint_lines(self.start_y, &self.lines[0..1], fill, bounds, window);
            self.paint_lines(
                self.start_y + self.line_height,
                &self.lines[1..],
                fill,
                bounds,
                window,
            );
        } else {
            self.paint_lines(self.start_y, &self.lines, fill, bounds, window);
        }
    }

    fn paint_lines(
        &self,
        start_y: Pixels,
        lines: &[HighlightedRangeLine],
        fill: bool,
        _bounds: Bounds<Pixels>,
        window: &mut Window,
    ) {
        if lines.is_empty() {
            return;
        }

        let first_line = lines.first().unwrap();
        let last_line = lines.last().unwrap();

        let first_top_left = point(first_line.start_x, start_y);
        let first_top_right = point(first_line.end_x, start_y);

        let curve_height = point(Pixels::ZERO, self.corner_radius);
        let curve_width = |start_x: Pixels, end_x: Pixels| {
            let max = (end_x - start_x) / 2.;
            let width = if max < self.corner_radius {
                max
            } else {
                self.corner_radius
            };

            point(width, Pixels::ZERO)
        };

        let top_curve_width = curve_width(first_line.start_x, first_line.end_x);
        let mut builder = if fill {
            gpui::PathBuilder::fill()
        } else {
            gpui::PathBuilder::stroke(px(1.))
        };
        builder.move_to(first_top_right - top_curve_width);
        builder.curve_to(first_top_right + curve_height, first_top_right);

        let mut iter = lines.iter().enumerate().peekable();
        while let Some((ix, line)) = iter.next() {
            let bottom_right = point(line.end_x, start_y + (ix + 1) as f32 * self.line_height);

            if let Some((_, next_line)) = iter.peek() {
                let next_top_right = point(next_line.end_x, bottom_right.y);

                match next_top_right.x.partial_cmp(&bottom_right.x).unwrap() {
                    Ordering::Equal => {
                        builder.line_to(bottom_right);
                    }
                    Ordering::Less => {
                        let curve_width = curve_width(next_top_right.x, bottom_right.x);
                        builder.line_to(bottom_right - curve_height);
                        if self.corner_radius > Pixels::ZERO {
                            builder.curve_to(bottom_right - curve_width, bottom_right);
                        }
                        builder.line_to(next_top_right + curve_width);
                        if self.corner_radius > Pixels::ZERO {
                            builder.curve_to(next_top_right + curve_height, next_top_right);
                        }
                    }
                    Ordering::Greater => {
                        let curve_width = curve_width(bottom_right.x, next_top_right.x);
                        builder.line_to(bottom_right - curve_height);
                        if self.corner_radius > Pixels::ZERO {
                            builder.curve_to(bottom_right + curve_width, bottom_right);
                        }
                        builder.line_to(next_top_right - curve_width);
                        if self.corner_radius > Pixels::ZERO {
                            builder.curve_to(next_top_right + curve_height, next_top_right);
                        }
                    }
                }
            } else {
                let curve_width = curve_width(line.start_x, line.end_x);
                builder.line_to(bottom_right - curve_height);
                if self.corner_radius > Pixels::ZERO {
                    builder.curve_to(bottom_right - curve_width, bottom_right);
                }

                let bottom_left = point(line.start_x, bottom_right.y);
                builder.line_to(bottom_left + curve_width);
                if self.corner_radius > Pixels::ZERO {
                    builder.curve_to(bottom_left - curve_height, bottom_left);
                }
            }
        }

        if first_line.start_x > last_line.start_x {
            let curve_width = curve_width(last_line.start_x, first_line.start_x);
            let second_top_left = point(last_line.start_x, start_y + self.line_height);
            builder.line_to(second_top_left + curve_height);
            if self.corner_radius > Pixels::ZERO {
                builder.curve_to(second_top_left + curve_width, second_top_left);
            }
            let first_bottom_left = point(first_line.start_x, second_top_left.y);
            builder.line_to(first_bottom_left - curve_width);
            if self.corner_radius > Pixels::ZERO {
                builder.curve_to(first_bottom_left - curve_height, first_bottom_left);
            }
        }

        builder.line_to(first_top_left + curve_height);
        if self.corner_radius > Pixels::ZERO {
            builder.curve_to(first_top_left + top_curve_width, first_top_left);
        }
        builder.line_to(first_top_right - top_curve_width);

        if let Ok(path) = builder.build() {
            window.paint_path(path, self.color);
        }
    }
}

enum CursorPopoverType {
    CodeContextMenu,
    EditPrediction,
}

pub fn register_action<T: Action>(
    editor: &Entity<Editor>,
    window: &mut Window,
    listener: impl Fn(&mut Editor, &T, &mut Window, &mut Context<Editor>) + 'static,
) {
    let editor = editor.clone();
    window.on_action(TypeId::of::<T>(), move |action, phase, window, cx| {
        let action = action.downcast_ref().unwrap();
        if phase == DispatchPhase::Bubble {
            editor.update(cx, |editor, cx| {
                listener(editor, action, window, cx);
            })
        }
    })
}

/// Shared between `prepaint` and `compute_auto_height_layout` to ensure
/// both full and auto-height editors compute wrap widths consistently.
fn calculate_wrap_width(
    soft_wrap: SoftWrap,
    editor_width: Pixels,
    em_width: Pixels,
) -> Option<Pixels> {
    let wrap_width_for = |column: u32| (column as f32 * em_width).ceil();

    match soft_wrap {
        SoftWrap::GitDiff => None,
        SoftWrap::None => Some(wrap_width_for(MAX_LINE_LEN as u32 / 2)),
        SoftWrap::EditorWidth => Some(editor_width),
        SoftWrap::Bounded(column) => Some(editor_width.min(wrap_width_for(column))),
    }
}

fn compute_auto_height_layout(
    editor: &mut Editor,
    min_lines: usize,
    max_lines: Option<usize>,
    known_dimensions: Size<Option<Pixels>>,
    available_width: AvailableSpace,
    window: &mut Window,
    cx: &mut Context<Editor>,
) -> Option<Size<Pixels>> {
    let width = known_dimensions.width.or({
        if let AvailableSpace::Definite(available_width) = available_width {
            Some(available_width)
        } else {
            None
        }
    })?;
    if let Some(height) = known_dimensions.height {
        return Some(size(width, height));
    }

    let style = editor.style.as_ref().unwrap();
    let font_id = window.text_system().resolve_font(&style.text.font());
    let font_size = style.text.font_size.to_pixels(window.rem_size());
    let line_height = style.text.line_height_in_pixels(window.rem_size());
    let em_width = window.text_system().em_width(font_id, font_size).unwrap();

    let mut snapshot = editor.snapshot(window, cx);
    let gutter_dimensions = snapshot.gutter_dimensions(font_id, font_size, style, window, cx);

    editor.gutter_dimensions = gutter_dimensions;
    let text_width = width - gutter_dimensions.width;
    let overscroll = size(em_width, px(0.));

    let editor_width = text_width - gutter_dimensions.margin - overscroll.width - em_width;
    let wrap_width = calculate_wrap_width(editor.soft_wrap_mode(cx), editor_width, em_width)
        .map(|width| width.min(editor_width));
    if wrap_width.is_some() && editor.set_wrap_width(wrap_width, cx) {
        snapshot = editor.snapshot(window, cx);
    }

    let scroll_height = (snapshot.max_point().row().next_row().0 as f32) * line_height;

    let min_height = line_height * min_lines as f32;
    let content_height = scroll_height.max(min_height);

    let final_height = if let Some(max_lines) = max_lines {
        let max_height = line_height * max_lines as f32;
        content_height.min(max_height)
    } else {
        content_height
    };

    Some(size(width, final_height))
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::{
        Editor, HighlightKey, MultiBuffer, NavigationOverlayKey, NavigationOverlayLabel,
        NavigationTargetOverlay, SelectionEffects,
        display_map::{BlockPlacement, BlockProperties},
        editor_tests::{init_test, update_test_language_settings},
    };
    use gpui::{TestAppContext, VisualTestContext};
    use language::{Buffer, language_settings, tree_sitter_python};
    use log::info;
    use rand::{RngCore, rngs::StdRng};
    use std::num::NonZeroU32;
    use util::test::sample_text;

    enum PrimaryNavigationOverlay {}

    const PRIMARY_NAVIGATION_OVERLAY_KEY: NavigationOverlayKey =
        NavigationOverlayKey::unique::<PrimaryNavigationOverlay>();

    fn navigation_overlay(
        label_text: &'static str,
        target_range: Range<Anchor>,
        covered_text_range: Option<Range<Anchor>>,
    ) -> NavigationTargetOverlay {
        NavigationTargetOverlay {
            target_range,
            label: NavigationOverlayLabel {
                text: SharedString::from(label_text),
                text_color: Hsla::black(),
                x_offset: Pixels::ZERO,
                scale_factor: 1.0,
            },
            covered_text_range,
        }
    }

    fn navigation_label_layouts(state: &EditorLayout) -> Vec<&NavigationLabelLayout> {
        state
            .navigation_overlay_paint_commands
            .iter()
            .map(|command| match command {
                NavigationOverlayPaintCommand::Label(label) => label,
            })
            .collect()
    }

    const fn placeholder_hitbox() -> Hitbox {
        use gpui::HitboxId;
        let zero_bounds = Bounds {
            origin: point(Pixels::ZERO, Pixels::ZERO),
            size: Size {
                width: Pixels::ZERO,
                height: Pixels::ZERO,
            },
        };

        Hitbox {
            id: HitboxId::placeholder(),
            bounds: zero_bounds,
            content_mask: ContentMask {
                bounds: zero_bounds,
            },
            behavior: HitboxBehavior::Normal,
        }
    }

    fn test_gutter(line_height: Pixels, snapshot: &EditorSnapshot) -> Gutter<'_> {
        const DIMENSIONS: GutterDimensions = GutterDimensions {
            left_padding: Pixels::ZERO,
            right_padding: Pixels::ZERO,
            width: px(30.0),
            margin: Pixels::ZERO,
            git_blame_entries_width: None,
        };
        const EMPTY_ROW_INFO: RowInfo = RowInfo {
            buffer_id: None,
            buffer_row: None,
            multibuffer_row: None,
            diff_status: None,
            expand_info: None,
            wrapped_buffer_row: None,
        };

        const fn row_info(row: u32) -> RowInfo {
            RowInfo {
                buffer_row: Some(row),
                ..EMPTY_ROW_INFO
            }
        }

        const ROW_INFOS: [RowInfo; 6] = [
            row_info(0),
            row_info(1),
            row_info(2),
            row_info(3),
            row_info(4),
            row_info(5),
        ];

        const HITBOX: Hitbox = placeholder_hitbox();
        Gutter {
            line_height,
            range: DisplayRow(0)..DisplayRow(6),
            scroll_position: gpui::Point::default(),
            dimensions: &DIMENSIONS,
            hitbox: &HITBOX,
            snapshot: snapshot,
            row_infos: &ROW_INFOS,
        }
    }

    #[gpui::test]
    async fn test_soft_wrap_editor_width_auto_height_editor(cx: &mut TestAppContext) {
        init_test(cx, |_| {});
        let window = cx.add_window(|window, cx| {
            let buffer = MultiBuffer::build_simple(&"a ".to_string().repeat(100), cx);
            let mut editor = Editor::new(
                EditorMode::AutoHeight {
                    min_lines: 1,
                    max_lines: None,
                },
                buffer,
                None,
                window,
                cx,
            );
            editor.set_soft_wrap_mode(language_settings::SoftWrap::EditorWidth, cx);
            editor
        });
        let cx = &mut VisualTestContext::from_window(*window, cx);
        let editor = window.root(cx).unwrap();
        let style = cx.update(|_, cx| editor.update(cx, |editor, cx| editor.style(cx).clone()));

        for x in 1..=100 {
            let (_, state) = cx.draw(
                Default::default(),
                size(px(200. + 0.13 * x as f32), px(500.)),
                |_, _| EditorElement::new(&editor, style.clone()),
            );

            assert!(
                state.position_map.scroll_max.x == 0.,
                "Soft wrapped editor should have no horizontal scrolling!"
            );
        }
    }

    #[gpui::test]
    async fn test_soft_wrap_editor_width_full_editor(cx: &mut TestAppContext) {
        init_test(cx, |_| {});
        let window = cx.add_window(|window, cx| {
            let buffer = MultiBuffer::build_simple(&"a ".to_string().repeat(100), cx);
            let mut editor = Editor::new(EditorMode::full(), buffer, None, window, cx);
            editor.set_soft_wrap_mode(language_settings::SoftWrap::EditorWidth, cx);
            editor
        });
        let cx = &mut VisualTestContext::from_window(*window, cx);
        let editor = window.root(cx).unwrap();
        let style = cx.update(|_, cx| editor.update(cx, |editor, cx| editor.style(cx).clone()));

        for x in 1..=100 {
            let (_, state) = cx.draw(
                Default::default(),
                size(px(200. + 0.13 * x as f32), px(500.)),
                |_, _| EditorElement::new(&editor, style.clone()),
            );

            assert!(
                state.position_map.scroll_max.x == 0.,
                "Soft wrapped editor should have no horizontal scrolling!"
            );
        }
    }

    #[gpui::test]
    async fn test_point_for_position_clipped_rows(cx: &mut TestAppContext) {
        init_test(cx, |_| {});

        let text = "aaa\nbbb";
        let window = cx.add_window(|window, cx| {
            let buffer = MultiBuffer::build_simple(text, cx);
            Editor::new(EditorMode::full(), buffer, None, window, cx)
        });

        let cx = &mut VisualTestContext::from_window(*window, cx);
        let editor = window.root(cx).unwrap();
        let style = editor.update(cx, |editor, cx| editor.style(cx).clone());
        let line_height = window
            .update(cx, |_, window, _| {
                style.text.line_height_in_pixels(window.rem_size())
            })
            .unwrap();

        // the first line is clipped
        let (_, state) = cx.draw(
            point(Pixels::ZERO, Pixels::ZERO - line_height * 1.5),
            size(px(500.), px(500.)),
            |_, _| EditorElement::new(&editor, style),
        );

        // click at the end of the second line
        let target_point = DisplayPoint::new(DisplayRow(1), 3);
        let click_x = state.content_origin.x
            + editor.update_in(cx, |editor, window, cx| {
                editor
                    .snapshot(window, cx)
                    .x_for_display_point(target_point, &editor.text_layout_details(window, cx))
            });

        let point = state
            .position_map
            .point_for_position(point(click_x, px(0.)));
        assert_eq!(point.nearest_valid, target_point);
    }

    #[gpui::test]
    fn test_navigation_overlay_covered_text_highlights_are_replaced(cx: &mut TestAppContext) {
        init_test(cx, |_| {});
        let window = cx.add_window(|window, cx| {
            let buffer = MultiBuffer::build_simple("overlay replacement", cx);
            Editor::new(EditorMode::full(), buffer, None, window, cx)
        });
        let editor = window.root(cx).unwrap();

        editor.update(cx, |editor, cx| {
            let buffer_snapshot = editor.buffer().read(cx).snapshot(cx);
            let target_start = buffer_snapshot.anchor_after(Point::new(0, 0));
            let target_end = buffer_snapshot.anchor_after(Point::new(0, 7));
            let covered_text_end = buffer_snapshot.anchor_after(Point::new(0, 2));

            editor.set_navigation_overlays(
                PRIMARY_NAVIGATION_OVERLAY_KEY,
                vec![navigation_overlay(
                    "ov",
                    target_start..target_end,
                    Some(target_start..covered_text_end),
                )],
                cx,
            );
            assert!(
                editor
                    .text_highlights(
                        HighlightKey::NavigationOverlay(PRIMARY_NAVIGATION_OVERLAY_KEY),
                        cx,
                    )
                    .is_some()
            );

            editor.set_navigation_overlays(
                PRIMARY_NAVIGATION_OVERLAY_KEY,
                vec![navigation_overlay("ov", target_start..target_end, None)],
                cx,
            );
            assert!(
                editor
                    .text_highlights(
                        HighlightKey::NavigationOverlay(PRIMARY_NAVIGATION_OVERLAY_KEY),
                        cx,
                    )
                    .is_none()
            );
        });
    }

    #[gpui::test]
    async fn test_navigation_overlay_repositions_when_editor_width_changes(
        cx: &mut TestAppContext,
    ) {
        init_test(cx, |_| {});
        let text = "jump target overlay ".repeat(16);
        let window = cx.add_window(|window, cx| {
            let buffer = MultiBuffer::build_simple(&text, cx);
            let mut editor = Editor::new(EditorMode::full(), buffer, None, window, cx);
            editor.set_soft_wrap_mode(language_settings::SoftWrap::EditorWidth, cx);
            editor
        });
        let cx = &mut VisualTestContext::from_window(*window, cx);
        let editor = window.root(cx).unwrap();

        editor.update(cx, |editor, cx| {
            let buffer_snapshot = editor.buffer().read(cx).snapshot(cx);
            let target_start = buffer_snapshot.anchor_after(Point::new(0, 30));
            let target_end = buffer_snapshot.anchor_after(Point::new(0, 40));

            editor.set_navigation_overlays(
                PRIMARY_NAVIGATION_OVERLAY_KEY,
                vec![navigation_overlay("jj", target_start..target_end, None)],
                cx,
            );
        });

        let style = cx.update(|_, cx| editor.update(cx, |editor, cx| editor.style(cx).clone()));
        let (_, wide_state) = cx.draw(Default::default(), size(px(520.), px(260.)), |_, _| {
            EditorElement::new(&editor, style.clone())
        });
        let (_, narrow_state) = cx.draw(Default::default(), size(px(140.), px(260.)), |_, _| {
            EditorElement::new(&editor, style.clone())
        });

        let wide_label_layouts = navigation_label_layouts(&wide_state);
        let narrow_label_layouts = navigation_label_layouts(&narrow_state);

        assert_eq!(wide_label_layouts.len(), 1);
        assert_eq!(narrow_label_layouts.len(), 1);

        let wide_label_origin = wide_label_layouts[0].origin;
        let narrow_label_origin = narrow_label_layouts[0].origin;

        assert!(
            narrow_label_origin.y > wide_label_origin.y,
            "expected inline label to move to a later wrapped row when the editor narrows"
        );
        assert!(
            narrow_label_origin.x < wide_label_origin.x,
            "expected inline label to recompute its horizontal position for the wrapped row"
        );
    }

    #[gpui::test]
    fn test_layout_line_numbers(cx: &mut TestAppContext) {
        init_test(cx, |_| {});
        let window = cx.add_window(|window, cx| {
            let buffer = MultiBuffer::build_simple(&sample_text(6, 6, 'a'), cx);
            Editor::new(EditorMode::full(), buffer, None, window, cx)
        });

        let editor = window.root(cx).unwrap();
        let style = editor.update(cx, |editor, cx| editor.style(cx).clone());
        let line_height = window
            .update(cx, |_, window, _| {
                style.text.line_height_in_pixels(window.rem_size())
            })
            .unwrap();
        let element = EditorElement::new(&editor, style);
        let snapshot = window
            .update(cx, |editor, window, cx| editor.snapshot(window, cx))
            .unwrap();

        let layouts = cx
            .update_window(*window, |_, window, cx| {
                element.layout_line_numbers(
                    &test_gutter(line_height, &snapshot),
                    &BTreeMap::default(),
                    Some(DisplayRow(0)),
                    window,
                    cx,
                )
            })
            .unwrap();
        assert_eq!(layouts.len(), 6);

        let relative_rows = window
            .update(cx, |editor, window, cx| {
                let snapshot = editor.snapshot(window, cx);
                snapshot.calculate_relative_line_numbers(
                    &(DisplayRow(0)..DisplayRow(6)),
                    DisplayRow(3),
                    false,
                )
            })
            .unwrap();
        assert_eq!(relative_rows[&DisplayRow(0)], 3);
        assert_eq!(relative_rows[&DisplayRow(1)], 2);
        assert_eq!(relative_rows[&DisplayRow(2)], 1);
        // current line has no relative number
        assert!(!relative_rows.contains_key(&DisplayRow(3)));
        assert_eq!(relative_rows[&DisplayRow(4)], 1);
        assert_eq!(relative_rows[&DisplayRow(5)], 2);

        // works if cursor is before screen
        let relative_rows = window
            .update(cx, |editor, window, cx| {
                let snapshot = editor.snapshot(window, cx);
                snapshot.calculate_relative_line_numbers(
                    &(DisplayRow(3)..DisplayRow(6)),
                    DisplayRow(1),
                    false,
                )
            })
            .unwrap();
        assert_eq!(relative_rows.len(), 3);
        assert_eq!(relative_rows[&DisplayRow(3)], 2);
        assert_eq!(relative_rows[&DisplayRow(4)], 3);
        assert_eq!(relative_rows[&DisplayRow(5)], 4);

        // works if cursor is after screen
        let relative_rows = window
            .update(cx, |editor, window, cx| {
                let snapshot = editor.snapshot(window, cx);
                snapshot.calculate_relative_line_numbers(
                    &(DisplayRow(0)..DisplayRow(3)),
                    DisplayRow(6),
                    false,
                )
            })
            .unwrap();
        assert_eq!(relative_rows.len(), 3);
        assert_eq!(relative_rows[&DisplayRow(0)], 5);
        assert_eq!(relative_rows[&DisplayRow(1)], 4);
        assert_eq!(relative_rows[&DisplayRow(2)], 3);

        let gutter = Gutter {
            row_infos: &(0..6)
                .map(|row| RowInfo {
                    buffer_row: Some(row),
                    diff_status: (row == DELETED_LINE).then(|| {
                        DiffHunkStatus::deleted(
                            buffer_diff::DiffHunkSecondaryStatus::NoSecondaryHunk,
                        )
                    }),
                    ..Default::default()
                })
                .collect::<Vec<_>>(),
            ..test_gutter(line_height, &snapshot)
        };

        const DELETED_LINE: u32 = 3;
        let layouts = cx
            .update_window(*window, |_, window, cx| {
                element.layout_line_numbers(
                    &gutter,
                    &BTreeMap::default(),
                    Some(DisplayRow(0)),
                    window,
                    cx,
                )
            })
            .unwrap();
        assert_eq!(layouts.len(), 5,);
        assert!(
            layouts.get(&MultiBufferRow(DELETED_LINE)).is_none(),
            "Deleted line should not have a line number"
        );
    }

    #[gpui::test]
    async fn test_layout_line_numbers_with_folded_lines(cx: &mut TestAppContext) {
        init_test(cx, |_| {});

        let python_lang = languages::language("python", tree_sitter_python::LANGUAGE.into());

        let window = cx.add_window(|window, cx| {
            let buffer = cx.new(|cx| {
                Buffer::local(
                    indoc::indoc! {"
                        fn test() -> int {
                            return 2;
                        }

                        fn another_test() -> int {
                            # This is a very peculiar method that is hard to grasp.
                            return 4;
                        }
                    "},
                    cx,
                )
                .with_language(python_lang, cx)
            });

            let buffer = MultiBuffer::build_from_buffer(buffer, cx);
            Editor::new(EditorMode::full(), buffer, None, window, cx)
        });

        let editor = window.root(cx).unwrap();
        let style = editor.update(cx, |editor, cx| editor.style(cx).clone());
        let line_height = window
            .update(cx, |_, window, _| {
                style.text.line_height_in_pixels(window.rem_size())
            })
            .unwrap();
        let element = EditorElement::new(&editor, style);
        let snapshot = window
            .update(cx, |editor, window, cx| {
                editor.fold_at(MultiBufferRow(0), window, cx);
                editor.snapshot(window, cx)
            })
            .unwrap();

        let layouts = cx
            .update_window(*window, |_, window, cx| {
                element.layout_line_numbers(
                    &test_gutter(line_height, &snapshot),
                    &BTreeMap::default(),
                    Some(DisplayRow(3)),
                    window,
                    cx,
                )
            })
            .unwrap();
        assert_eq!(layouts.len(), 6);

        let relative_rows = window
            .update(cx, |editor, window, cx| {
                let snapshot = editor.snapshot(window, cx);
                snapshot.calculate_relative_line_numbers(
                    &(DisplayRow(0)..DisplayRow(6)),
                    DisplayRow(3),
                    false,
                )
            })
            .unwrap();
        assert_eq!(relative_rows[&DisplayRow(0)], 3);
        assert_eq!(relative_rows[&DisplayRow(1)], 2);
        assert_eq!(relative_rows[&DisplayRow(2)], 1);
        // current line has no relative number
        assert!(!relative_rows.contains_key(&DisplayRow(3)));
        assert_eq!(relative_rows[&DisplayRow(4)], 1);
        assert_eq!(relative_rows[&DisplayRow(5)], 2);
    }

    #[gpui::test]
    fn test_layout_line_numbers_wrapping(cx: &mut TestAppContext) {
        init_test(cx, |_| {});
        let window = cx.add_window(|window, cx| {
            let buffer = MultiBuffer::build_simple(&sample_text(6, 6, 'a'), cx);
            Editor::new(EditorMode::full(), buffer, None, window, cx)
        });

        update_test_language_settings(cx, &|s| {
            s.defaults.preferred_line_length = Some(5_u32);
            s.defaults.soft_wrap = Some(language_settings::SoftWrap::Bounded);
        });

        let editor = window.root(cx).unwrap();
        let style = editor.update(cx, |editor, cx| editor.style(cx).clone());
        let line_height = window
            .update(cx, |_, window, _| {
                style.text.line_height_in_pixels(window.rem_size())
            })
            .unwrap();
        let element = EditorElement::new(&editor, style);
        let snapshot = window
            .update(cx, |editor, window, cx| editor.snapshot(window, cx))
            .unwrap();

        let layouts = cx
            .update_window(*window, |_, window, cx| {
                element.layout_line_numbers(
                    &test_gutter(line_height, &snapshot),
                    &BTreeMap::default(),
                    Some(DisplayRow(0)),
                    window,
                    cx,
                )
            })
            .unwrap();
        assert_eq!(layouts.len(), 3);

        let relative_rows = window
            .update(cx, |editor, window, cx| {
                let snapshot = editor.snapshot(window, cx);
                snapshot.calculate_relative_line_numbers(
                    &(DisplayRow(0)..DisplayRow(6)),
                    DisplayRow(3),
                    true,
                )
            })
            .unwrap();

        assert_eq!(relative_rows[&DisplayRow(0)], 3);
        assert_eq!(relative_rows[&DisplayRow(1)], 2);
        assert_eq!(relative_rows[&DisplayRow(2)], 1);
        // current line has no relative number
        assert!(!relative_rows.contains_key(&DisplayRow(3)));
        assert_eq!(relative_rows[&DisplayRow(4)], 1);
        assert_eq!(relative_rows[&DisplayRow(5)], 2);

        let layouts = cx
            .update_window(*window, |_, window, cx| {
                element.layout_line_numbers(
                    &Gutter {
                        row_infos: &(0..6)
                            .map(|row| RowInfo {
                                buffer_row: Some(row),
                                diff_status: Some(DiffHunkStatus::deleted(
                                    buffer_diff::DiffHunkSecondaryStatus::NoSecondaryHunk,
                                )),
                                ..Default::default()
                            })
                            .collect::<Vec<_>>(),
                        ..test_gutter(line_height, &snapshot)
                    },
                    &BTreeMap::from_iter([(DisplayRow(0), LineHighlightSpec::default())]),
                    Some(DisplayRow(0)),
                    window,
                    cx,
                )
            })
            .unwrap();
        assert!(
            layouts.is_empty(),
            "Deleted lines should have no line number"
        );

        let relative_rows = window
            .update(cx, |editor, window, cx| {
                let snapshot = editor.snapshot(window, cx);
                snapshot.calculate_relative_line_numbers(
                    &(DisplayRow(0)..DisplayRow(6)),
                    DisplayRow(3),
                    true,
                )
            })
            .unwrap();

        // Deleted lines should still have relative numbers
        assert_eq!(relative_rows[&DisplayRow(0)], 3);
        assert_eq!(relative_rows[&DisplayRow(1)], 2);
        assert_eq!(relative_rows[&DisplayRow(2)], 1);
        // current line, even if deleted, has no relative number
        assert!(!relative_rows.contains_key(&DisplayRow(3)));
        assert_eq!(relative_rows[&DisplayRow(4)], 1);
        assert_eq!(relative_rows[&DisplayRow(5)], 2);
    }

    #[gpui::test]
    async fn test_vim_visual_selections(cx: &mut TestAppContext) {
        init_test(cx, |_| {});

        let window = cx.add_window(|window, cx| {
            let buffer = MultiBuffer::build_simple(&(sample_text(6, 6, 'a') + "\n"), cx);
            Editor::new(EditorMode::full(), buffer, None, window, cx)
        });
        let cx = &mut VisualTestContext::from_window(*window, cx);
        let editor = window.root(cx).unwrap();
        let style = cx.update(|_, cx| editor.update(cx, |editor, cx| editor.style(cx).clone()));

        window
            .update(cx, |editor, window, cx| {
                editor.cursor_offset_on_selection = true;
                editor.change_selections(SelectionEffects::no_scroll(), window, cx, |s| {
                    s.select_ranges([
                        Point::new(0, 0)..Point::new(1, 0),
                        Point::new(3, 2)..Point::new(3, 3),
                        Point::new(5, 6)..Point::new(6, 0),
                    ]);
                });
            })
            .unwrap();

        let (_, state) = cx.draw(
            point(px(500.), px(500.)),
            size(px(500.), px(500.)),
            |_, _| EditorElement::new(&editor, style),
        );

        assert_eq!(state.selections.len(), 1);
        let local_selections = &state.selections[0].1;
        assert_eq!(local_selections.len(), 3);
        // moves cursor back one line
        assert_eq!(
            local_selections[0].head,
            DisplayPoint::new(DisplayRow(0), 6)
        );
        assert_eq!(
            local_selections[0].range,
            DisplayPoint::new(DisplayRow(0), 0)..DisplayPoint::new(DisplayRow(1), 0)
        );

        // moves cursor back one column
        assert_eq!(
            local_selections[1].range,
            DisplayPoint::new(DisplayRow(3), 2)..DisplayPoint::new(DisplayRow(3), 3)
        );
        assert_eq!(
            local_selections[1].head,
            DisplayPoint::new(DisplayRow(3), 2)
        );

        // leaves cursor on the max point
        assert_eq!(
            local_selections[2].range,
            DisplayPoint::new(DisplayRow(5), 6)..DisplayPoint::new(DisplayRow(6), 0)
        );
        assert_eq!(
            local_selections[2].head,
            DisplayPoint::new(DisplayRow(6), 0)
        );

        // active lines does not include 1 (even though the range of the selection does)
        assert_eq!(
            state.active_rows.keys().cloned().collect::<Vec<_>>(),
            vec![DisplayRow(0), DisplayRow(3), DisplayRow(5), DisplayRow(6)]
        );
    }

    #[gpui::test]
    fn test_layout_with_placeholder_text_and_blocks(cx: &mut TestAppContext) {
        init_test(cx, |_| {});

        let window = cx.add_window(|window, cx| {
            let buffer = MultiBuffer::build_simple("", cx);
            Editor::new(EditorMode::full(), buffer, None, window, cx)
        });
        let cx = &mut VisualTestContext::from_window(*window, cx);
        let editor = window.root(cx).unwrap();
        let style = cx.update(|_, cx| editor.update(cx, |editor, cx| editor.style(cx).clone()));
        window
            .update(cx, |editor, window, cx| {
                editor.set_placeholder_text("hello", window, cx);
                editor.insert_blocks(
                    [BlockProperties {
                        style: BlockStyle::Fixed,
                        placement: BlockPlacement::Above(Anchor::Min),
                        height: Some(3),
                        render: Arc::new(|cx| div().h(3. * cx.window.line_height()).into_any()),
                        priority: 0,
                    }],
                    None,
                    cx,
                );

                // Blur the editor so that it displays placeholder text.
                window.blur();
            })
            .unwrap();

        let (_, state) = cx.draw(
            point(px(500.), px(500.)),
            size(px(500.), px(500.)),
            |_, _| EditorElement::new(&editor, style),
        );
        assert_eq!(state.position_map.line_layouts.len(), 4);
        assert_eq!(state.line_numbers.len(), 1);
        assert_eq!(
            state
                .line_numbers
                .get(&MultiBufferRow(0))
                .map(|line_number| line_number
                    .segments
                    .first()
                    .unwrap()
                    .shaped_line
                    .text
                    .as_ref()),
            Some("1")
        );
    }

    #[gpui::test]
    fn test_all_invisibles_drawing(cx: &mut TestAppContext) {
        const TAB_SIZE: u32 = 4;

        let input_text = "\t \t|\t| a b";
        let expected_invisibles = vec![
            Invisible::Tab {
                line_start_offset: 0,
                line_end_offset: TAB_SIZE as usize,
            },
            Invisible::Whitespace {
                line_start_offset: TAB_SIZE as usize,
                line_end_offset: TAB_SIZE as usize + 1,
            },
            Invisible::Tab {
                line_start_offset: TAB_SIZE as usize + 1,
                line_end_offset: TAB_SIZE as usize * 2,
            },
            Invisible::Tab {
                line_start_offset: TAB_SIZE as usize * 2 + 1,
                line_end_offset: TAB_SIZE as usize * 3,
            },
            Invisible::Whitespace {
                line_start_offset: TAB_SIZE as usize * 3 + 1,
                line_end_offset: TAB_SIZE as usize * 3 + 2,
            },
            Invisible::Whitespace {
                line_start_offset: TAB_SIZE as usize * 3 + 3,
                line_end_offset: TAB_SIZE as usize * 3 + 4,
            },
        ];
        assert_eq!(
            expected_invisibles.len(),
            input_text
                .chars()
                .filter(|initial_char| initial_char.is_whitespace())
                .count(),
            "Hardcoded expected invisibles differ from the actual ones in '{input_text}'"
        );

        for show_line_numbers in [true, false] {
            init_test(cx, |s| {
                s.defaults.show_whitespaces = Some(ShowWhitespaceSetting::All);
                s.defaults.tab_size = NonZeroU32::new(TAB_SIZE);
            });

            let actual_invisibles = collect_invisibles_from_new_editor(
                cx,
                EditorMode::full(),
                input_text,
                px(500.0),
                show_line_numbers,
            );

            assert_eq!(expected_invisibles, actual_invisibles);
        }
    }

    #[gpui::test]
    fn test_multibyte_whitespace_uses_utf8_byte_offsets(cx: &mut TestAppContext) {
        init_test(cx, |s| {
            s.defaults.show_whitespaces = Some(ShowWhitespaceSetting::All);
        });

        // Regression test for #49186. NBSP (U+00A0) is rendered via the invisible
        // character `replacement` pipeline, which flushes the internal `line`
        // scratch buffer mid-line. Any whitespace invisible that follows must use
        // the absolute byte offset within the logical line (here: byte 4 for the
        // trailing ASCII space), not an offset relative to the post-flush buffer.
        let actual_invisibles = collect_invisibles_from_new_editor(
            cx,
            EditorMode::full(),
            "a\u{00A0}b ",
            px(500.0),
            false,
        );

        assert_eq!(
            actual_invisibles,
            vec![Invisible::Whitespace {
                line_start_offset: 4,
                line_end_offset: 5,
            }]
        );
    }

    #[gpui::test]
    fn test_replacement_chunks_are_clipped_to_max_line_len(cx: &mut TestAppContext) {
        init_test(cx, |_| {});

        let window = cx.add_window(|window, cx| {
            let buffer = MultiBuffer::build_simple("", cx);
            Editor::new(EditorMode::full(), buffer, None, window, cx)
        });
        let cx = &mut VisualTestContext::from_window(*window, cx);
        let editor = window.root(cx).unwrap();
        let style = cx.update(|_, cx| editor.update(cx, |editor, cx| editor.style(cx).clone()));
        let editor_mode = EditorMode::full();
        let max_line_len = "\u{00a0}abcdef".len();

        window
            .update(cx, |_, window, cx| {
                let chunks = std::iter::once(HighlightedChunk {
                    text: "\u{00a0}",
                    style: None,
                    is_tab: false,
                    is_inlay: false,
                    replacement: Some(ChunkReplacement::Str("\u{2007}".into())),
                })
                .chain(std::iter::once(HighlightedChunk {
                    text: "abcdefghi",
                    style: None,
                    is_tab: false,
                    is_inlay: false,
                    replacement: None,
                }))
                .chain(
                    std::iter::repeat_with(|| HighlightedChunk {
                        text: "\u{00a0}",
                        style: None,
                        is_tab: false,
                        is_inlay: false,
                        replacement: Some(ChunkReplacement::Str("\u{2007}".into())),
                    })
                    .take(8),
                );

                let layouts = LineWithInvisibles::from_chunks(
                    chunks,
                    &style,
                    max_line_len,
                    1,
                    &editor_mode,
                    px(500.),
                    |_| false,
                    &[],
                    window,
                    cx,
                );

                assert_eq!(layouts.len(), 1);
                assert_eq!(layouts[0].len, max_line_len);
                assert!(layouts[0].fragments.len() <= max_line_len);
            })
            .unwrap();
    }

    #[gpui::test]
    fn test_invisibles_dont_appear_in_certain_editors(cx: &mut TestAppContext) {
        init_test(cx, |s| {
            s.defaults.show_whitespaces = Some(ShowWhitespaceSetting::All);
            s.defaults.tab_size = NonZeroU32::new(4);
        });

        for editor_mode_without_invisibles in [
            EditorMode::SingleLine,
            EditorMode::AutoHeight {
                min_lines: 1,
                max_lines: Some(100),
            },
        ] {
            for show_line_numbers in [true, false] {
                let invisibles = collect_invisibles_from_new_editor(
                    cx,
                    editor_mode_without_invisibles.clone(),
                    "\t\t\t| | a b",
                    px(500.0),
                    show_line_numbers,
                );
                assert!(
                    invisibles.is_empty(),
                    "For editor mode {editor_mode_without_invisibles:?} no invisibles was expected but got {invisibles:?}"
                );
            }
        }
    }

    #[gpui::test]
    fn test_wrapped_invisibles_drawing(cx: &mut TestAppContext) {
        let tab_size = 4;
        let input_text = "a\tbcd     ".repeat(9);
        let repeated_invisibles = [
            Invisible::Tab {
                line_start_offset: 1,
                line_end_offset: tab_size as usize,
            },
            Invisible::Whitespace {
                line_start_offset: tab_size as usize + 3,
                line_end_offset: tab_size as usize + 4,
            },
            Invisible::Whitespace {
                line_start_offset: tab_size as usize + 4,
                line_end_offset: tab_size as usize + 5,
            },
            Invisible::Whitespace {
                line_start_offset: tab_size as usize + 5,
                line_end_offset: tab_size as usize + 6,
            },
            Invisible::Whitespace {
                line_start_offset: tab_size as usize + 6,
                line_end_offset: tab_size as usize + 7,
            },
            Invisible::Whitespace {
                line_start_offset: tab_size as usize + 7,
                line_end_offset: tab_size as usize + 8,
            },
        ];
        let expected_invisibles = std::iter::once(repeated_invisibles)
            .cycle()
            .take(9)
            .flatten()
            .collect::<Vec<_>>();
        assert_eq!(
            expected_invisibles.len(),
            input_text
                .chars()
                .filter(|initial_char| initial_char.is_whitespace())
                .count(),
            "Hardcoded expected invisibles differ from the actual ones in '{input_text}'"
        );
        info!("Expected invisibles: {expected_invisibles:?}");

        init_test(cx, |_| {});

        // Put the same string with repeating whitespace pattern into editors of various size,
        // take deliberately small steps during resizing, to put all whitespace kinds near the wrap point.
        let resize_step = 10.0;
        let mut editor_width = 200.0;
        while editor_width <= 1000.0 {
            for show_line_numbers in [true, false] {
                update_test_language_settings(cx, &|s| {
                    s.defaults.tab_size = NonZeroU32::new(tab_size);
                    s.defaults.show_whitespaces = Some(ShowWhitespaceSetting::All);
                    s.defaults.preferred_line_length = Some(editor_width as u32);
                    s.defaults.soft_wrap = Some(language_settings::SoftWrap::Bounded);
                });

                let actual_invisibles = collect_invisibles_from_new_editor(
                    cx,
                    EditorMode::full(),
                    &input_text,
                    px(editor_width),
                    show_line_numbers,
                );

                // Whatever the editor size is, ensure it has the same invisible kinds in the same order
                // (no good guarantees about the offsets: wrapping could trigger padding and its tests should check the offsets).
                let mut i = 0;
                for (actual_index, actual_invisible) in actual_invisibles.iter().enumerate() {
                    i = actual_index;
                    match expected_invisibles.get(i) {
                        Some(expected_invisible) => match (expected_invisible, actual_invisible) {
                            (Invisible::Whitespace { .. }, Invisible::Whitespace { .. })
                            | (Invisible::Tab { .. }, Invisible::Tab { .. }) => {}
                            _ => {
                                panic!(
                                    "At index {i}, expected invisible {expected_invisible:?} does not match actual {actual_invisible:?} by kind. Actual invisibles: {actual_invisibles:?}"
                                )
                            }
                        },
                        None => {
                            panic!("Unexpected extra invisible {actual_invisible:?} at index {i}")
                        }
                    }
                }
                let missing_expected_invisibles = &expected_invisibles[i + 1..];
                assert!(
                    missing_expected_invisibles.is_empty(),
                    "Missing expected invisibles after index {i}: {missing_expected_invisibles:?}"
                );

                editor_width += resize_step;
            }
        }
    }

    fn collect_invisibles_from_new_editor(
        cx: &mut TestAppContext,
        editor_mode: EditorMode,
        input_text: &str,
        editor_width: Pixels,
        show_line_numbers: bool,
    ) -> Vec<Invisible> {
        info!(
            "Creating editor with mode {editor_mode:?}, width {}px and text '{input_text}'",
            f32::from(editor_width)
        );
        let window = cx.add_window(|window, cx| {
            let buffer = MultiBuffer::build_simple(input_text, cx);
            Editor::new(editor_mode, buffer, None, window, cx)
        });
        let cx = &mut VisualTestContext::from_window(*window, cx);
        let editor = window.root(cx).unwrap();

        let style = editor.update(cx, |editor, cx| editor.style(cx).clone());
        window
            .update(cx, |editor, _, cx| {
                editor.set_soft_wrap_mode(language_settings::SoftWrap::EditorWidth, cx);
                editor.set_wrap_width(Some(editor_width), cx);
                editor.set_show_line_numbers(show_line_numbers, cx);
            })
            .unwrap();
        let (_, state) = cx.draw(
            point(px(500.), px(500.)),
            size(px(500.), px(500.)),
            |_, _| EditorElement::new(&editor, style),
        );
        state
            .position_map
            .line_layouts
            .iter()
            .flat_map(|line_with_invisibles| &line_with_invisibles.invisibles)
            .cloned()
            .collect()
    }

    #[gpui::test]
    fn test_merge_overlapping_ranges() {
        let base_bg = Hsla::white();
        let color1 = Hsla {
            h: 0.0,
            s: 0.5,
            l: 0.5,
            a: 0.5,
        };
        let color2 = Hsla {
            h: 120.0,
            s: 0.5,
            l: 0.5,
            a: 0.5,
        };

        let display_point = |col| DisplayPoint::new(DisplayRow(0), col);
        let cols = |v: &Vec<(Range<DisplayPoint>, Hsla)>| -> Vec<(u32, u32)> {
            v.iter()
                .map(|(r, _)| (r.start.column(), r.end.column()))
                .collect()
        };

        // Test overlapping ranges blend colors
        let overlapping = vec![
            (display_point(5)..display_point(15), color1),
            (display_point(10)..display_point(20), color2),
        ];
        let result = EditorElement::merge_overlapping_ranges(overlapping, base_bg);
        assert_eq!(cols(&result), vec![(5, 10), (10, 15), (15, 20)]);

        // Test middle segment should have blended color
        let blended = Hsla::blend(Hsla::blend(base_bg, color1), color2);
        assert_eq!(result[1].1, blended);

        // Test adjacent same-color ranges merge
        let adjacent_same = vec![
            (display_point(5)..display_point(10), color1),
            (display_point(10)..display_point(15), color1),
        ];
        let result = EditorElement::merge_overlapping_ranges(adjacent_same, base_bg);
        assert_eq!(cols(&result), vec![(5, 15)]);

        // Test contained range splits
        let contained = vec![
            (display_point(5)..display_point(20), color1),
            (display_point(10)..display_point(15), color2),
        ];
        let result = EditorElement::merge_overlapping_ranges(contained, base_bg);
        assert_eq!(cols(&result), vec![(5, 10), (10, 15), (15, 20)]);

        // Test multiple overlaps split at every boundary
        let color3 = Hsla {
            h: 240.0,
            s: 0.5,
            l: 0.5,
            a: 0.5,
        };
        let complex = vec![
            (display_point(5)..display_point(12), color1),
            (display_point(8)..display_point(16), color2),
            (display_point(10)..display_point(14), color3),
        ];
        let result = EditorElement::merge_overlapping_ranges(complex, base_bg);
        assert_eq!(
            cols(&result),
            vec![(5, 8), (8, 10), (10, 12), (12, 14), (14, 16)]
        );
    }

    #[gpui::test]
    fn test_bg_segments_per_row() {
        let base_bg = Hsla::white();

        // Case A: selection spans three display rows: row 1 [5, end), full row 2, row 3 [0, 7)
        {
            let selection_color = Hsla {
                h: 200.0,
                s: 0.5,
                l: 0.5,
                a: 0.5,
            };
            let player_color = PlayerColor {
                cursor: selection_color,
                background: selection_color,
                selection: selection_color,
            };

            let spanning_selection = SelectionLayout {
                head: DisplayPoint::new(DisplayRow(3), 7),
                cursor_shape: CursorShape::Bar,
                is_newest: true,
                is_local: true,
                range: DisplayPoint::new(DisplayRow(1), 5)..DisplayPoint::new(DisplayRow(3), 7),
                active_rows: DisplayRow(1)..DisplayRow(4),
                user_name: None,
            };

            let selections = vec![(player_color, vec![spanning_selection])];
            let result = EditorElement::bg_segments_per_row(
                DisplayRow(0)..DisplayRow(5),
                &selections,
                [].into_iter(),
                base_bg,
            );

            assert_eq!(result.len(), 5);
            assert!(result[0].is_empty());
            assert_eq!(result[1].len(), 1);
            assert_eq!(result[2].len(), 1);
            assert_eq!(result[3].len(), 1);
            assert!(result[4].is_empty());

            assert_eq!(result[1][0].0.start, DisplayPoint::new(DisplayRow(1), 5));
            assert_eq!(result[1][0].0.end.row(), DisplayRow(1));
            assert_eq!(result[1][0].0.end.column(), u32::MAX);
            assert_eq!(result[2][0].0.start, DisplayPoint::new(DisplayRow(2), 0));
            assert_eq!(result[2][0].0.end.row(), DisplayRow(2));
            assert_eq!(result[2][0].0.end.column(), u32::MAX);
            assert_eq!(result[3][0].0.start, DisplayPoint::new(DisplayRow(3), 0));
            assert_eq!(result[3][0].0.end, DisplayPoint::new(DisplayRow(3), 7));
        }

        // Case B: selection ends exactly at the start of row 3, excluding row 3
        {
            let selection_color = Hsla {
                h: 120.0,
                s: 0.5,
                l: 0.5,
                a: 0.5,
            };
            let player_color = PlayerColor {
                cursor: selection_color,
                background: selection_color,
                selection: selection_color,
            };

            let selection = SelectionLayout {
                head: DisplayPoint::new(DisplayRow(2), 0),
                cursor_shape: CursorShape::Bar,
                is_newest: true,
                is_local: true,
                range: DisplayPoint::new(DisplayRow(1), 5)..DisplayPoint::new(DisplayRow(3), 0),
                active_rows: DisplayRow(1)..DisplayRow(3),
                user_name: None,
            };

            let selections = vec![(player_color, vec![selection])];
            let result = EditorElement::bg_segments_per_row(
                DisplayRow(0)..DisplayRow(4),
                &selections,
                [].into_iter(),
                base_bg,
            );

            assert_eq!(result.len(), 4);
            assert!(result[0].is_empty());
            assert_eq!(result[1].len(), 1);
            assert_eq!(result[2].len(), 1);
            assert!(result[3].is_empty());

            assert_eq!(result[1][0].0.start, DisplayPoint::new(DisplayRow(1), 5));
            assert_eq!(result[1][0].0.end.row(), DisplayRow(1));
            assert_eq!(result[1][0].0.end.column(), u32::MAX);
            assert_eq!(result[2][0].0.start, DisplayPoint::new(DisplayRow(2), 0));
            assert_eq!(result[2][0].0.end.row(), DisplayRow(2));
            assert_eq!(result[2][0].0.end.column(), u32::MAX);
        }
    }

    #[cfg(test)]
    fn generate_test_run(len: usize, color: Hsla) -> TextRun {
        TextRun {
            len,
            color,
            ..Default::default()
        }
    }

    #[gpui::test]
    fn test_split_runs_by_bg_segments(cx: &mut gpui::TestAppContext) {
        init_test(cx, |_| {});

        let dx = |start: u32, end: u32| {
            DisplayPoint::new(DisplayRow(0), start)..DisplayPoint::new(DisplayRow(0), end)
        };

        let text_color = Hsla {
            h: 210.0,
            s: 0.1,
            l: 0.4,
            a: 1.0,
        };
        let bg_1 = Hsla {
            h: 30.0,
            s: 0.6,
            l: 0.8,
            a: 1.0,
        };
        let bg_2 = Hsla {
            h: 200.0,
            s: 0.6,
            l: 0.2,
            a: 1.0,
        };
        let min_contrast = 45.0;
        let adjusted_bg1 = ensure_minimum_contrast(text_color, bg_1, min_contrast);
        let adjusted_bg2 = ensure_minimum_contrast(text_color, bg_2, min_contrast);

        // Case A: single run; disjoint segments inside the run
        {
            let runs = vec![generate_test_run(20, text_color)];
            let segs = vec![(dx(5, 10), bg_1), (dx(12, 16), bg_2)];
            let out = LineWithInvisibles::split_runs_by_bg_segments(&runs, &segs, min_contrast, 0);
            // Expected slices: [0,5) [5,10) [10,12) [12,16) [16,20)
            assert_eq!(
                out.iter().map(|r| r.len).collect::<Vec<_>>(),
                vec![5, 5, 2, 4, 4]
            );
            assert_eq!(out[0].color, text_color);
            assert_eq!(out[1].color, adjusted_bg1);
            assert_eq!(out[2].color, text_color);
            assert_eq!(out[3].color, adjusted_bg2);
            assert_eq!(out[4].color, text_color);
        }

        // Case B: multiple runs; segment extends to end of line (u32::MAX)
        {
            let runs = vec![
                generate_test_run(8, text_color),
                generate_test_run(7, text_color),
            ];
            let segs = vec![(dx(6, u32::MAX), bg_1)];
            let out = LineWithInvisibles::split_runs_by_bg_segments(&runs, &segs, min_contrast, 0);
            // Expected slices across runs: [0,6) [6,8) | [0,7)
            assert_eq!(out.iter().map(|r| r.len).collect::<Vec<_>>(), vec![6, 2, 7]);
            assert_eq!(out[0].color, text_color);
            assert_eq!(out[1].color, adjusted_bg1);
            assert_eq!(out[2].color, adjusted_bg1);
        }

        // Case C: multi-byte characters
        {
            // for text: "Hello 🌍 世界!"
            let runs = vec![
                generate_test_run(5, text_color), // "Hello"
                generate_test_run(6, text_color), // " 🌍 "
                generate_test_run(6, text_color), // "世界"
                generate_test_run(1, text_color), // "!"
            ];
            // selecting "🌍 世"
            let segs = vec![(dx(6, 14), bg_1)];
            let out = LineWithInvisibles::split_runs_by_bg_segments(&runs, &segs, min_contrast, 0);
            // "Hello" | " " | "🌍 " | "世" | "界" | "!"
            assert_eq!(
                out.iter().map(|r| r.len).collect::<Vec<_>>(),
                vec![5, 1, 5, 3, 3, 1]
            );
            assert_eq!(out[0].color, text_color); // "Hello"
            assert_eq!(out[2].color, adjusted_bg1); // "🌍 "
            assert_eq!(out[3].color, adjusted_bg1); // "世"
            assert_eq!(out[4].color, text_color); // "界"
            assert_eq!(out[5].color, text_color); // "!"
        }

        // Case D: split multiple consecutive text runs with segments
        {
            let segs = vec![
                (dx(2, 4), bg_1),   // selecting "cd"
                (dx(4, 8), bg_2),   // selecting "efgh"
                (dx(9, 11), bg_1),  // selecting "jk"
                (dx(12, 16), bg_2), // selecting "mnop"
                (dx(18, 19), bg_1), // selecting "s"
            ];

            // for text: "abcdef"
            let runs = vec![
                generate_test_run(2, text_color), // ab
                generate_test_run(4, text_color), // cdef
            ];
            let out = LineWithInvisibles::split_runs_by_bg_segments(&runs, &segs, min_contrast, 0);
            // new splits "ab", "cd", "ef"
            assert_eq!(out.iter().map(|r| r.len).collect::<Vec<_>>(), vec![2, 2, 2]);
            assert_eq!(out[0].color, text_color);
            assert_eq!(out[1].color, adjusted_bg1);
            assert_eq!(out[2].color, adjusted_bg2);

            // for text: "ghijklmn"
            let runs = vec![
                generate_test_run(3, text_color), // ghi
                generate_test_run(2, text_color), // jk
                generate_test_run(3, text_color), // lmn
            ];
            let out = LineWithInvisibles::split_runs_by_bg_segments(&runs, &segs, min_contrast, 6); // 2 + 4 from first run
            // new splits "gh", "i", "jk", "l", "mn"
            assert_eq!(
                out.iter().map(|r| r.len).collect::<Vec<_>>(),
                vec![2, 1, 2, 1, 2]
            );
            assert_eq!(out[0].color, adjusted_bg2);
            assert_eq!(out[1].color, text_color);
            assert_eq!(out[2].color, adjusted_bg1);
            assert_eq!(out[3].color, text_color);
            assert_eq!(out[4].color, adjusted_bg2);

            // for text: "opqrs"
            let runs = vec![
                generate_test_run(1, text_color), // o
                generate_test_run(4, text_color), // pqrs
            ];
            let out = LineWithInvisibles::split_runs_by_bg_segments(&runs, &segs, min_contrast, 14); // 6 + 3 + 2 + 3 from first two runs
            // new splits "o", "p", "qr", "s"
            assert_eq!(
                out.iter().map(|r| r.len).collect::<Vec<_>>(),
                vec![1, 1, 2, 1]
            );
            assert_eq!(out[0].color, adjusted_bg2);
            assert_eq!(out[1].color, adjusted_bg2);
            assert_eq!(out[2].color, text_color);
            assert_eq!(out[3].color, adjusted_bg1);
        }
    }

    #[test]
    fn test_spacer_pattern_period() {
        // line height is smaller than target height, so we just return half the line height
        assert_eq!(EditorElement::spacer_pattern_period(10.0, 20.0), 5.0);

        // line height is exactly half the target height, perfect match
        assert_eq!(EditorElement::spacer_pattern_period(20.0, 10.0), 10.0);

        // line height is close to half the target height
        assert_eq!(EditorElement::spacer_pattern_period(20.0, 9.0), 10.0);

        // line height is close to 1/4 the target height
        assert_eq!(EditorElement::spacer_pattern_period(20.0, 4.8), 5.0);
    }

    #[gpui::test(iterations = 100)]
    fn test_random_spacer_pattern_period(mut rng: StdRng) {
        let line_height = rng.next_u32() as f32;
        let target_height = rng.next_u32() as f32;

        let result = EditorElement::spacer_pattern_period(line_height, target_height);

        let k = line_height / result;
        assert!(k - k.round() < 0.0000001); // approximately integer
        assert!((k.round() as u32).is_multiple_of(2));
    }

    #[test]
    fn test_calculate_wrap_width() {
        let editor_width = px(800.0);
        let em_width = px(8.0);

        assert_eq!(
            calculate_wrap_width(SoftWrap::GitDiff, editor_width, em_width),
            None,
        );

        assert_eq!(
            calculate_wrap_width(SoftWrap::None, editor_width, em_width),
            Some(px((MAX_LINE_LEN as f32 / 2.0 * 8.0).ceil())),
        );

        assert_eq!(
            calculate_wrap_width(SoftWrap::EditorWidth, editor_width, em_width),
            Some(px(800.0)),
        );

        assert_eq!(
            calculate_wrap_width(SoftWrap::Bounded(72), editor_width, em_width),
            Some(px((72.0 * 8.0_f32).ceil())),
        );
        assert_eq!(
            calculate_wrap_width(SoftWrap::Bounded(200), px(400.0), em_width),
            Some(px(400.0)),
        );
    }
}