message: Fix storing the last open left pane.
  It was including context, but we don't want to store that as a possible left pane we can open up again.
diff: @@ -134,7 +134,7 @@ export class Store extends VuexStore<Store, Actions, Mutations> {
  notificationState: ActivityFeedState | null = null;
  mobileCbarShowing = false;
  - lastOpenLeftPane: TogglableLeftPane = 'library';
  + lastOpenLeftPane: Exclude<TogglableLeftPane, 'context'> = 'library';
  private overlayedLeftPane: TogglableLeftPane = '';
  private overlayedRightPane = '';
  hasContentSidebar = false;
  @@ -557,7 +557,7 @@ export class Store extends VuexStore<Store, Actions, Mutations> {
  this.overlayedLeftPane = type;
  }
  - if (type) {
  + if (type && type !== 'context') {
  this.lastOpenLeftPane = type;
  }
  