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Charlie Marsh
eceb3eeaf3
## Why Sizing, rendering, and cursor placement can query the same chat widget layout multiple times in one frame, repeatedly measuring active transcript cells. ## What changed - Build one chat widget renderable tree per frame and reuse it for sizing, rendering, and cursor placement. - Cache each flex child's desired height by width for the lifetime of that tree. - Reuse the bottom pane's renderable directly instead of forwarding each renderable operation through a wrapper. ## Testing - Verify flex layouts measure a child once across frame passes and remeasure it when the width changes. - Verify a chat widget frame measures its active transcript cell once. GitOrigin-RevId: 5ad1a6711f4011c699b5d002b13dc3319cb4db8e