The desktop composer's `onKeyUp` handler unconditionally re-ran
`refreshTrigger` on every keyup, including the Arrow/Enter/Tab/Escape keys
the open-trigger `onKeyDown` branch had already fully handled. Because
`refreshTrigger` re-detects the trigger and resets the active index to 0,
this produced two bugs in the `/` (and `@`) completion popover:
- ArrowDown/ArrowUp moved the highlight on keydown, then keyup snapped it
straight back to the top — so the user could never cycle past the first
couple of items.
- Escape closed the menu on keydown, then keyup re-detected the still-present
`/` and immediately reopened it — so Esc appeared to do nothing.
Fix: skip the keyup-driven refresh for the navigation/control keys while a
trigger menu is open (they never edit text, so refreshing is pointless), and
only reset the highlight in `refreshTrigger` when the detected trigger query
actually changed. Applied to both the main composer (chat/composer/index.tsx)
and the message-edit composer (assistant-ui/thread.tsx), which shared the
same bug. New `shouldSkipTriggerRefreshOnKeyUp` helper is unit-tested.
188e52db91