Adds windowed rendering to FilesView in ReviewSidebar.tsx using
react-window 2.x (List component). File lists with more than 50 rows
render only visible items, keeping the DOM lean for large diffs.
- Install react-window 2.x and @types/react-window in apps/web
- Flatten directory-grouped file tree into a typed Row[] array via useMemo
- Use VariableSizeList-equivalent react-window 2.x List with rowHeight fn
(32px for dir-headers, 40px for file rows); falls back to plain DOM
render for ≤50 rows to avoid overhead on small diffs
- Directories are collapsible: clicking the dir-header toggles collapse,
removing its file rows from the Row[] and from the virtual list
- Preserve sidebar scroll offset across Files ↔ Commits tab switches via
filesScrollOffsetRef passed from ReviewSidebar into FilesView
- Clicking a file calls listRef.scrollToRow({ index, align: "smart" })
to keep the clicked row visible in the virtual list
- Root-level files (directory === "") render without a dir-header,
preserving existing behavior
- Add resolve.dedupe for react/react-dom in vitest.config.ts to prevent
duplicate-React errors after local workspace package installation
- Add 6 Vitest + RTL tests covering: large-list DOM count, small-list
fallback, collapse, re-expand, tab-switch smoke, root-level files
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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