Fix collapsed user message height jump on mount#206
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SDSLeon
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Jun 19, 2026
SDSLeon
commented
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- Long user messages briefly rendered at full height before collapsing, so the chat virtualizer cached an oversized row and then shrank it on the next frame
- That size delta triggered scroll compensation and stuck the view at the bottom, blocking scroll-up past the message
- Apply the 4-line clamp on first paint so collapsed height is stable before overflow is measured
- Defer the fade gradient until overflow is confirmed so short messages do not flash a mask
- Bugfix for chat scroll behavior when mounting or remounting collapsed user messages
- Apply line clamp on first paint before overflow measurement - Defer fade mask until overflow is confirmed - Lift clamp for short messages after first measurement pass
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