The #89788 gate read main-tab ownership from a plain module Map — invisible
to React — and openGroupChat set the selection atom before recording the
tab. Every open therefore rendered BotsPane in a selected-but-unowned
window, painting the in-pane room beside the main tab, and the duplicate
stuck because the later Map write repaints nothing.
- $groupMainTabsRev atom shadows tab-map membership; all mutations go
through recordGroupMainTab/dropGroupMainTab; BotsPane subscribes, so the
in-pane gate re-evaluates on tab open/close.
- openGroupChat records the tab BEFORE setting the selection atom; older
desktops without the main-window door (and a throwing door) still get
the in-pane fallback.
- Regression tests: gate is false at the instant the selection atom flips
(fails on the old ordering — sabotage-verified), and rev bumps on tab
open/close.
Teknium
d29f76c70e