fix(calls): Reject sends the decline to the ring notification (#313)

handleReject related the MSC4310 decline to the caller's call.member event
(the notification's reference), but MSC4310 and Element Call match a
decline against the rtc.notification event itself, so the caller kept
"Calling…" for the full 90 s after being told "Declined", and declines
from other clients (correctly referencing the notification) didn't stop
Lotus ringing on other devices.

- The incoming call keeps the notification's own event id; Reject relates
  the decline to it.
- The "declined on another device" dismissal and declinedRing accept
  either id (older Lotus builds referenced the membership).
- The missed-call line is skipped for a call we declined.

Verified headless (DM, Bob rings, Reject): the decline used to reference
the membership; it now references the notification. Unit test added.

Fixes #313

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

src/app/components/CallEmbedProvider.tsx

@@ -111,6 +111,8 @@ type IncomingCallInfo = {
   intent?: string;
   notificationType: RTCNotificationType;
   refEventId: string;
+  /** [Gitea #313] The rtc.notification event itself: what a decline must reference (MSC4310). */
+  notificationEventId?: string;
 };
 type IncomingCallProps = {
   dm: boolean;
@@ -283,7 +285,9 @@ function IncomingCall({ dm, info, onIgnore, onAnswer, onReject }: IncomingCallPr
                   fill="Soft"
                   size="400"
                   radii="400"
-                  onClick={() => (dm ? onReject(room, info.refEventId) : onIgnore())}
+                  onClick={() =>
+                    dm ? onReject(room, info.notificationEventId ?? info.refEventId) : onIgnore()
+                  }
                   before={<Icon size="200" src={Icons.Cross} filled />}
                 >
                   <Text as="span" size="B400">
@@ -455,7 +459,9 @@ function IncomingCallBanner({ dm, info, onIgnore, onAnswer, onReject }: Incoming
           size="300"
           radii="300"
           outlined
-          onClick={() => (dm ? onReject(room, info.refEventId) : onIgnore())}
+          onClick={() =>
+            dm ? onReject(room, info.notificationEventId ?? info.refEventId) : onIgnore()
+          }
           before={<Icon size="100" src={Icons.Cross} filled />}
         >
           <Text as="span" size="B300">
@@ -596,6 +602,7 @@ function IncomingCallListener({ callEmbed, joined }: IncomingCallListenerProps)
             : undefined,
         notificationType,
         refEventId,
+        notificationEventId: event.getId(),
       };
 
       // [Gitea #312] Don't ring for a call that is already over or handled: after
@@ -604,7 +611,10 @@ function IncomingCallListener({ callEmbed, joined }: IncomingCallListenerProps)
       // stale RTC session). The caller's membership can arrive just after the
       // ring, so an absent one gets a short grace period before giving up.
       const myUserId = mx.getSafeUserId();
-      if (declinedRing(room, refEventId, myUserId) || hasActiveCallMembership(room, myUserId)) {
+      if (
+        declinedRing(room, [refEventId, event.getId()], myUserId) ||
+        hasActiveCallMembership(room, myUserId)
+      ) {
         return;
       }
       if (hasActiveCallMembership(room, sender)) {
@@ -613,7 +623,10 @@ function IncomingCallListener({ callEmbed, joined }: IncomingCallListenerProps)
       }
       setTimeout(() => {
         if (Date.now() >= senderTs + lifetime) return;
-        if (declinedRing(room, refEventId, myUserId) || hasActiveCallMembership(room, myUserId)) {
+        if (
+          declinedRing(room, [refEventId, event.getId()], myUserId) ||
+          hasActiveCallMembership(room, myUserId)
+        ) {
           return;
         }
         if (hasActiveCallMembership(room, sender)) setCallInfo(info);
@@ -685,7 +698,10 @@ function IncomingCallListener({ callEmbed, joined }: IncomingCallListenerProps)
       if (eventRoom?.roomId !== room.roomId || !data.liveEvent) return;
       if (event.getType() === EventType.RTCDecline && event.getSender() === myUserId) {
         const related = event.getRelation()?.event_id;
-        if (!related || related === refEventId) dismiss(); // declined elsewhere
+        // [Gitea #313] Correct clients reference the notification; older Lotus
+        // builds referenced the call membership. Accept both.
+        if (!related || related === refEventId || related === callInfo.notificationEventId)
+          dismiss(); // declined elsewhere
       }
     };
     session.on(MatrixRTCSessionEvent.MembershipsChanged, checkMemberships);

src/app/features/room/RoomTimeline.tsx

@@ -138,7 +138,7 @@ import { useMediaAuthentication } from '../../hooks/useMediaAuthentication';
 import { useIgnoredUsers } from '../../hooks/useIgnoredUsers';
 import { useImagePackRooms } from '../../hooks/useImagePackRooms';
 import { useIsDirectRoom } from '../../hooks/useRoom';
-import { isRingableRoom } from '../../utils/callRing';
+import { declinedRing, isRingableRoom } from '../../utils/callRing';
 import { useOpenUserRoomProfile } from '../../state/hooks/userRoomProfile';
 import { useSpaceOptionally } from '../../hooks/useSpace';
 import { useRoomCreators } from '../../hooks/useRoomCreators';
@@ -2037,6 +2037,9 @@ export function RoomTimeline({ room, eventId, roomInputRef, editor }: RoomTimeli
         // Same rule as ringing: no "Missed call" in voice rooms or space
         // channels, where starting a call is just joining the channel.
         if (!isRingableRoom(room, direct)) return null;
+        // [Gitea #313] A call we declined isn't a missed call.
+        const ringRef = mEvent.getRelation()?.event_id;
+        if (declinedRing(room, [mEventId, ringRef], mx.getSafeUserId())) return null;
         const content = mEvent.getContent();
         const mention =
           content['m.mentions']?.room ||

src/app/utils/callRing.test.ts

@@ -67,3 +67,18 @@ test('declinedRing finds our own decline of that ring only (#312)', () => {
   assert.equal(declinedRing(room, '$ring2', '@me:x'), false, "someone else's decline");
   assert.equal(declinedRing(room, '$ring3', '@me:x'), false);
 });
+
+test('declinedRing matches a decline of the notification or of the membership (#313)', () => {
+  const decline = (rel: string) => ({
+    getType: () => 'org.matrix.msc4310.rtc.decline',
+    getSender: () => '@me:x',
+    getRelation: () => ({ event_id: rel }),
+  });
+  const room = stateRoom([], [decline('$notification')]);
+  assert.equal(declinedRing(room, ['$membership', '$notification'], '@me:x'), true);
+  assert.equal(declinedRing(room, ['$membership'], '@me:x'), false);
+  assert.equal(
+    declinedRing(stateRoom([], [decline('$membership')]), ['$membership', undefined], '@me:x'),
+    true,
+  );
+});

src/app/utils/callRing.ts

@@ -40,7 +40,18 @@ export const hasActiveCallMembership = (room: Room, userId: string): boolean =>
  * declined it (our own RTCDecline relates to it) — e.g. replayed together with
  * the ring in the first sync after a restart, before any dismiss listener.
  */
-export const declinedRing = (room: Room, refEventId: string, myUserId: string): boolean =>
+export const declinedRing = (
+  room: Room,
+  ringIds: string | Array<string | undefined>,
+  myUserId: string,
+): boolean => {
+  // [Gitea #313] A decline references the notification event (MSC4310); older
+  // Lotus builds referenced the call membership instead. Match either.
+  const ids = new Set((Array.isArray(ringIds) ? ringIds : [ringIds]).filter(Boolean));
+  return declinedAny(room, ids, myUserId);
+};
+
+const declinedAny = (room: Room, ids: Set<string | undefined>, myUserId: string): boolean =>
   room
     .getLiveTimeline()
     .getEvents()
@@ -48,5 +59,5 @@ export const declinedRing = (room: Room, refEventId: string, myUserId: string):
       (ev) =>
         ev.getType() === 'org.matrix.msc4310.rtc.decline' &&
         ev.getSender() === myUserId &&
-        ev.getRelation()?.event_id === refEventId,
+        ids.has(ev.getRelation()?.event_id),
     );