perf(timeline): eliminate room-open jitter, flash, and scroll drift#698

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Just-Insane wants to merge 67 commits intoSableClient:devfrom

Just-Insane:perf/timeline-rendering

Commits on Apr 14, 2026

perf: memoize VList timeline items to prevent mass re-renders
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fix(timeline): make mutationVersion optional in UseProcessedTimelineOptions
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fix(timeline): satisfy lint rules in TimelineItem memo component
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chore: add changeset for perf-timeline-item-memo
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fix(timeline): preempt atBottom to prevent Jump to Latest flashing at bottom
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fix(timeline): suppress intermediate VList scroll events after programmatic scroll-to-bottom
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fix(timeline): set programmatic guard in scrollToBottom; keep guard active through all intermediate VList events
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fix(notifications): defer notification jump until live timeline is non-empty
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fix(timeline): skip scroll-cache save when viewing a historical eventId slice
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test(timeline): add useProcessedTimeline unit tests + fix stale itemIndex in stable-ref check
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perf(timeline): restore VList cache + skip 80 ms timer on room revisit
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fix(timeline): correct scroll-cache save/load paths
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fix(timeline): save scroll cache in pendingReadyRef recovery path
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chore: add changeset for perf-timeline-scroll-cache
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fix(timeline): preempt atBottom to prevent Jump to Latest flashing at bottom
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fix(timeline): suppress intermediate VList scroll events after programmatic scroll-to-bottom
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test(timeline): add roomScrollCache unit tests
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fix: auto-format roomScrollCache test file for prettier compliance
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refactor(timeline): replace eslint-disables with custom areEqual comparator for TimelineItem memo
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fix(ui): phantom unread dot + blank notification page recovery
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fix: use useLayoutEffect for auto-scroll recovery after timeline reset When sliding sync upgrades a room subscription (timeline_limit 1 → 50), a TimelineReset replaces the VList content. The auto-…
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fix(timeline): use scrollToIndex for stay-at-bottom and remove premature scroll
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fix(timeline): use timestamp-based settling window to suppress spurious Jump to Latest button Replace the boolean programmaticScrollToBottomRef guard with a timestamp (Date.now()) and a 200 ms set…
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Commits on Apr 15, 2026

Commits on Apr 16, 2026

Commits on Apr 17, 2026

Commits on Apr 18, 2026

Commits on Apr 19, 2026