message: Use more performant getMembersCount to decide to hide or show sender
diff: @@ -712,7 +712,7 @@ export default class MessagePanel extends React.Component<IProps, IState> {
  const callEventGrouper = this.callEventGroupers.get(mxEv.getContent().call_id);
  - const isDirectMessage = this.props.room?.getJoinedMemberCount() <= 2;
  + const isDirectMessage = this.props.room?.getMembersCount() <= 2;
  // use txnId as key if available so that we don't remount during sending
  ret.push(
  