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8b16d21785
Agent rewrites surface to chokidar as `unlink` + `add` (+ optional
`change`) within a single tick. ProjectView refreshes the file list
on every event, so the open tab's active file vanishes for one frame
between the `unlink` and the `add`. FileWorkspace's `activeFile`
resolver returns null when the active name disappears from
`visibleFiles`, and the preview falls back to an empty state mid-run.
Add a trailing-coalesce around the file-changed refresh:
- First event arms an 80ms quiet window.
- Subsequent events inside the window reset it.
- A 250ms maxWait cap ensures a sustained edit storm still flushes.
- The intermediate `unlink` is absorbed by the next `add` and the
UI only sees a single, file-present refresh.
The coalesce is a small `useCoalescedCallback` hook so the timing
contract is unit-testable without standing up ProjectView. Tests
cover the rewrite burst, isolated single triggers, the maxWait cap
under sustained triggers, latest-callback semantics, and unmount
cleanup.
Fixes #2195
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| .. | ||
| useCoalescedCallback.test.tsx | ||
| useDesignMdState.test.tsx | ||
| useFinalizeProject.test.tsx | ||
| useProjectDetail.test.tsx | ||