When the m.fully_read marker event is older than the loaded timeline
window, no virtual ReadMarker item is inserted and the chevron-up FAB
silently no-ops. Surfaces the SDK's new fully_read_event_id on RoomInfo
and routes the tap through the existing FocusOnEvent flow so the FAB
appears in catch-up scenarios and lands the user on the marker.
Bumps matrix-rust-components-kotlin to 26.05.20 to pick up the FFI
field; absorbs the ClientBuildException.InvalidRawKey and suspend
SpaceRoomList.rooms / subscribeToRoomUpdate API breaks.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Jenna Vassar
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