Cancel pending events in virtual room when call placed

As the comment hopefully explains.

Also add public qualifiers to the methods in Resend which lacked
any visibility specifiers.

Fixes element-hq/element-web#17594

src/CallHandler.tsx

@@ -54,6 +54,7 @@ import { WidgetLayoutStore, Container } from './stores/widgets/WidgetLayoutStore
 import { getIncomingCallToastKey } from './toasts/IncomingCallToast';
 import ToastStore from './stores/ToastStore';
 import IncomingCallToast from "./toasts/IncomingCallToast";
+import Resend from './Resend';
 
 export const PROTOCOL_PSTN = 'm.protocol.pstn';
 export const PROTOCOL_PSTN_PREFIXED = 'im.vector.protocol.pstn';
@@ -737,6 +738,18 @@ export default class CallHandler extends EventEmitter {
         const mappedRoomId = (await VoipUserMapper.sharedInstance().getOrCreateVirtualRoomForRoom(roomId)) || roomId;
         logger.debug("Mapped real room " + roomId + " to room ID " + mappedRoomId);
 
+        // If we're using a virtual room nd there are any events pending, try to resend them,
+        // otherwise the call will fail and because its a virtual room, the user won't be able
+        // to see it to either retry or clear the pending events. There will only be call events
+        // in this queue, and since we're about to place a new call, they can only be events from
+        // previous calls that are probably stale by now, so just cancel them.
+        if (mappedRoomId !== roomId) {
+            const mappedRoom = MatrixClientPeg.get().getRoom(mappedRoomId);
+            if (mappedRoom.getPendingEvents().length > 0) {
+                Resend.cancelUnsentEvents(mappedRoom);
+            }
+        }
+
         const timeUntilTurnCresExpire = MatrixClientPeg.get().getTurnServersExpiry() - Date.now();
         logger.log("Current turn creds expire in " + timeUntilTurnCresExpire + " ms");
         const call = MatrixClientPeg.get().createCall(mappedRoomId);

src/Resend.ts

@@ -22,23 +22,23 @@ import { MatrixClientPeg } from './MatrixClientPeg';
 import dis from './dispatcher/dispatcher';
 
 export default class Resend {
-    static resendUnsentEvents(room: Room): Promise<void[]> {
+    public static resendUnsentEvents(room: Room): Promise<void[]> {
         return Promise.all(room.getPendingEvents().filter(function(ev: MatrixEvent) {
             return ev.status === EventStatus.NOT_SENT;
         }).map(function(event: MatrixEvent) {
             return Resend.resend(event);
         }));
     }
 
-    static cancelUnsentEvents(room: Room): void {
+    public static cancelUnsentEvents(room: Room): void {
         room.getPendingEvents().filter(function(ev: MatrixEvent) {
             return ev.status === EventStatus.NOT_SENT;
         }).forEach(function(event: MatrixEvent) {
             Resend.removeFromQueue(event);
         });
     }
 
-    static resend(event: MatrixEvent): Promise<void> {
+    public static resend(event: MatrixEvent): Promise<void> {
         const room = MatrixClientPeg.get().getRoom(event.getRoomId());
         return MatrixClientPeg.get().resendEvent(event, room).then(function(res) {
             dis.dispatch({
@@ -52,7 +52,7 @@ export default class Resend {
         });
     }
 
-    static removeFromQueue(event: MatrixEvent): void {
+    public static removeFromQueue(event: MatrixEvent): void {
         MatrixClientPeg.get().cancelPendingEvent(event);
     }
 }