With the mention list open, pressing Enter sent the half-typed text
("hey @bo") instead of inserting the highlighted person — found while
investigating the "composer hit a snag" report; only Tab picked. Enter now
picks the top suggestion for people, rooms and commands, as in Discord,
Slack and Element.
useAutocompleteEnter listens in the window capture phase (so it runs before
the composer's submit handler) and only while the list has suggestions —
with no command match Enter still sends. Emoji suggestions are deliberately
left on Tab only, so "lol :p" + Enter still sends rather than inserting an
emoji. IME composition and Shift/Ctrl+Enter are untouched. Tab now inserts
the member's display name, same as a click.
Verified: "@bo" + Enter inserts the mention and sends nothing; the next
Enter sends "hey @bob hi" with m.mentions; ":smi" + Enter still sends.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA
