message: Restore toggle LHS logic
diff: @@ -232,6 +232,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
  private accountPasswordTimer?: NodeJS.Timeout;
  private focusComposer: boolean;
  private subTitleStatus: string;
  + private prevWindowWidth: number;
  private readonly loggedInView: React.RefObject<LoggedInViewType>;
  private readonly dispatcherRef: any;
  @@ -277,6 +278,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
  }
  }
  + this.prevWindowWidth = UIStore.instance.windowWidth || 1000;
  UIStore.instance.on(UI_EVENTS.Resize, this.handleResize);
  this.pageChanging = false;
  @@ -1821,13 +1823,15 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
  const LHS_THRESHOLD = 1000;
  const width = UIStore.instance.windowWidth;
  - if (width <= LHS_THRESHOLD && !this.state.collapseLhs) {
  - dis.dispatch({ action: 'hide_left_panel' });
  - }
  - if (width > LHS_THRESHOLD && this.state.collapseLhs) {
  + if (this.prevWindowWidth < LHS_THRESHOLD && width >= LHS_THRESHOLD) {
  dis.dispatch({ action: 'show_left_panel' });
  }
  + if (this.prevWindowWidth >= LHS_THRESHOLD && width < LHS_THRESHOLD) {
  + dis.dispatch({ action: 'hide_left_panel' });
  + }
  +
  + this.prevWindowWidth = width;
  this.state.resizeNotifier.notifyWindowResized();
  };
  