[Fix] Chat window runs out of memory when transcript grows large#153
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| const computeMessageKey = useCallback((_index: number, messageOrGroup: ClineMessage) => messageOrGroup.ts, []) |
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ts is not unique in this codebase, so using it as the sole Virtuoso item key will collide on supported histories. We already have coverage for identical-timestamp transcripts in src/core/webview/__tests__/ClineProvider.spec.ts, and when that data hits this list React will reuse a row for multiple messages instead of keeping them distinct.
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Do not merge this PR, it's not ready for review, the bug needs to be replicated and then tested with this pr |
googlejam
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May 25, 2026
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What problem this solves
Fixes an issue where users can hit heavy memory pressure in the chat window as long transcripts grow, which can eventually leave the UI in a gray-screen failure state.
Why this change was made
The chat list was already using
react-virtuoso, but it was still pre-rendering a large amount of off-screen transcript content. This change tightens the off-screen render buffer, gives the virtualized list a stable item key, and provides a default row height so large transcripts keep less rich content mounted outside the viewport.User impact
Large chat transcripts keep less text and markdown mounted when they are off screen. That should lower memory usage in long-running sessions and reduce the chances of the gray-screen failure when the transcript gets large.