codex

mirror of https://github.com/openai/codex.git synced 2026-09-13 11:47:17 +00:00

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Charlie Marsh 3d7bb2dd2e Cache stable active-cell layout measurements (#38242 )

## What changed

- Reuse desired and rendered heights for active transcript cells that report a stable height.
- Invalidate the cached layout when the cell identity, revision, width, render mode, or syntax theme changes, and when the active cell is removed.
- Continue rebuilding display lines on every frame so animated content stays live, while dynamic-height cells bypass the persistent cache.

## Testing

- Add rendering tests for height reuse, bottom-anchored overflow, cache invalidation, animated display lines, and dynamic-height cells.

GitOrigin-RevId: 414cc4269bfb6b68105837c82e31787272d335a7

2026-08-12 19:43:32 +00:00