message: Unhide display names when switching back to modern layout
diff: @@ -289,6 +289,10 @@ export default class MessagePanel extends React.Component<IProps, IState> {
  }
  componentDidUpdate(prevProps, prevState) {
  + if (prevProps.layout !== this.props.layout) {
  + this.calculateRoomMembersCount();
  + }
  +
  if (prevProps.readMarkerVisible && this.props.readMarkerEventId !== prevProps.readMarkerEventId) {
  const ghostReadMarkers = this.state.ghostReadMarkers;
  ghostReadMarkers.push(prevProps.readMarkerEventId);
  