message: Ensure notification badges stop listening when they unmount
diff: @@ -72,6 +72,9 @@ export default class NotificationBadge extends React.PureComponent<XOR<IProps, I
  public componentWillUnmount() {
  SettingsStore.unwatchSetting(this.countWatcherRef);
  + if (this.props.notification) {
  + this.props.notification.off(NOTIFICATION_STATE_UPDATE, this.onNotificationUpdate);
  + }
  }
  public componentDidUpdate(prevProps: Readonly<IProps>) {
  