ensure all member streams are cloned

so we can stop them without affecting the main one
also, only stop them when disconnecting from the member, rather then
when the peer call ends, as we might want to retry connecting to
the peer with the same stream.

src/matrix/calls/LocalMedia.ts

@@ -37,10 +37,10 @@ export class LocalMedia {
         return new LocalMedia(this.userMedia, this.screenShare, options);
     }
 
-    clone() {
+    clone(): LocalMedia {
         return new LocalMedia(this.userMedia?.clone(), this.screenShare?.clone(), this.dataChannelOptions);
     }
-
+    
     dispose() {
         this.userMedia?.audioTrack?.stop();
         this.userMedia?.videoTrack?.stop();

src/matrix/calls/PeerCall.ts

@@ -814,7 +814,6 @@ export class PeerCall implements IDisposable {
         this.hangupParty = hangupParty;
         this._hangupReason = hangupReason;
         this.setState(CallState.Ended, log);
-        this.localMedia?.dispose();
         this.localMedia = undefined;
 
         if (this.peerConnection && this.peerConnection.signalingState !== 'closed') {

src/matrix/calls/group/GroupCall.ts

@@ -118,7 +118,7 @@ export class GroupCall extends EventEmitter<{change: never}> {
             this.emitChange();
             // send invite to all members that are < my userId
             for (const [,member] of this._members) {
-                member.connect(this._localMedia);
+                member.connect(this._localMedia!.clone());
             }
         });
     }
@@ -218,6 +218,7 @@ export class GroupCall extends EventEmitter<{change: never}> {
                             );
                             this._members.add(memberKey, member);
                             if (this._state === GroupCallState.Joining || this._state === GroupCallState.Joined) {
+                                // Safari can't send a MediaStream to multiple sources, so clone it
                                 member.connect(this._localMedia!.clone());
                             }
                         }
@@ -267,11 +268,11 @@ export class GroupCall extends EventEmitter<{change: never}> {
     private removeOwnDevice(log: ILogItem) {
         if (this._state === GroupCallState.Joined) {
             log.set("leave_own", true);
-            this._localMedia?.dispose();
-            this._localMedia = undefined;
             for (const [,member] of this._members) {
                 member.disconnect();
             }
+            this._localMedia?.dispose();
+            this._localMedia = undefined;
             this._state = GroupCallState.Created;
             this.emitChange();
         }

src/matrix/calls/group/Member.ts

@@ -104,6 +104,7 @@ export class Member {
             this.peerCall?.close(undefined, log);
             this.peerCall?.dispose();
             this.peerCall = undefined;
+            this.localMedia?.dispose();
             this.localMedia = undefined;
         });
     }