emit resize event when banners are shown/hidden to restore scroll pos

src/components/structures/MatrixChat.js

@@ -29,6 +29,7 @@ import PlatformPeg from "../../PlatformPeg";
 import SdkConfig from "../../SdkConfig";
 import * as RoomListSorter from "../../RoomListSorter";
 import dis from "../../dispatcher";
+import Notifier from '../../Notifier';
 
 import Modal from "../../Modal";
 import Tinter from "../../Tinter";
@@ -196,6 +197,7 @@ export default React.createClass({
 
             syncError: null, // If the current syncing status is ERROR, the error object, otherwise null.
             resizeNotifier: new ResizeNotifier(),
+            showNotifierToolbar: Notifier.shouldShowToolbar(),
         };
         return s;
     },
@@ -644,8 +646,9 @@ export default React.createClass({
             case 'view_invite':
                 showRoomInviteDialog(payload.roomId);
                 break;
-            case 'notifier_enabled':
-                this.forceUpdate();
+            case 'notifier_enabled': {
+                    this.setState({showNotifierToolbar: Notifier.shouldShowToolbar()});
+                }
                 break;
             case 'hide_left_panel':
                 this.setState({
@@ -1180,6 +1183,7 @@ export default React.createClass({
      */
     _onLoggedIn: async function() {
         this.setStateForNewView({view: VIEWS.LOGGED_IN});
+        this.setState({showNotifierToolbar: Notifier.shouldShowToolbar()});
         if (this._is_registered) {
             this._is_registered = false;
 
@@ -1672,7 +1676,10 @@ export default React.createClass({
     },
 
     _dispatchTimelineResize() {
-        dis.dispatch({ action: 'timeline_resize' }, true);
+        // prevent dispatch from within dispatch error
+        setTimeout(() => {
+            dis.dispatch({ action: 'timeline_resize' }, true);
+        }, 0);
     },
 
     onRoomCreated: function(roomId) {