message: Notify left panel of resizing when it is collapsed&expanded
diff: @@ -675,12 +675,16 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
  case 'hide_left_panel':
  this.setState({
  collapseLhs: true,
  + }, () => {
  + this.state.resizeNotifier.notifyLeftHandleResized();
  });
  break;
  case 'focus_room_filter': // for CtrlOrCmd+K to work by expanding the left panel first
  case 'show_left_panel':
  this.setState({
  collapseLhs: false,
  + }, () => {
  + this.state.resizeNotifier.notifyLeftHandleResized();
  });
  break;
  case 'panel_disable': {
  