Bohan Jiang 90455abd8d fix(desktop): preserve tab scroll position across Activity visibility cycles (MUL-2602) (#3196) ...

Closes #3183.

Tabs render under `<Activity mode="visible|hidden">`, which keeps React
state but drops DOM scrollTop when the subtree leaves layout. Switching
to another tab and back sent users to the top of long discussions.

`useTabScrollRestore` records the scrollTop of every element marked with
`data-tab-scroll-root` while the tab is visible (capture-phase scroll
listener) and restores them in a useLayoutEffect on the next visible
transition, before paint. Saved offsets are dropped when the tab's path
changes so intra-tab navigation lands at scroll=0 instead of inheriting
the previous route's position.

Mark scroll containers in views with `data-tab-scroll-root` (issue
detail + chat message list ship with the marker; other views can adopt
the convention as needed).

`useAutoScroll` previously called `scrollToBottom()` on every effect
mount, which would have overwritten the restored offset every time a
chat tab cycled back to visible. Guard it with a once-per-instance ref.

Co-authored-by: multica-agent <github@multica.ai>

2026-05-25 15:31:01 +08:00

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use-auto-scroll.ts

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use-mobile.ts

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use-scroll-fade.ts

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