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Motivation
Closed menus steal focus on mount and scroll async lists. Initialize previous visibility from
visible, preserving focus on open/close.Related issue
Closes #4907
Screenshots / Videos
Append 30 closed menus: before, focus moves to Menu 29 and scroll reaches 1620px; after, focus stays on the append button and scroll stays at 0.
Test plan
Append closed menus: focus/scroll stay put. Open: first item focuses. Escape: anchor focuses. Chrome checked.
695 tests and 234 snapshots pass; lint/typecheck pass. Hidden-mount regression fails before the fix.
Repro and DOM checks