Answering from the in-call banner is the only call-to-call switch path; it
started the new embed and let the atom dispose the old one, which just removed
the iframe — our m.call.member in the old room lingered ~17 s (until the
delayed leave expired), so everyone there still saw us in the call.
hangupAndWait moves out of LogoutDialog into plugins/call/hangup.ts and
handleAnswer now hangs up, waits for our membership to clear (bounded 4 s),
disposes the old embed itself (its HangupCall echo would otherwise land after
startCall and clear the NEW embed from the atom — seen in testing), then joins
the new call. Measured headless: old membership gone in 1 s, new call live
with both participants.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA
