Hangup all calls on logout

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

src/CallHandler.tsx

@@ -788,6 +788,11 @@ export default class CallHandler {
                 // don't remove the call yet: let the hangup event handler do it (otherwise it will throw
                 // the hangup event away)
                 break;
+            case 'hangup_all':
+                for (const call of this.calls.values()) {
+                    call.hangup(CallErrorCode.UserHangup, false);
+                }
+                break;
             case 'answer': {
                 if (!this.calls.has(payload.room_id)) {
                     return; // no call to answer

src/components/structures/MatrixChat.tsx

@@ -582,6 +582,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
                 }
                 break;
             case 'logout':
+                dis.dispatch({action: "hangup_all"});
                 Lifecycle.logout();
                 break;
             case 'require_registration':