Reload widget messaging when widgets reload

src/components/views/elements/AppTile.js

@@ -336,9 +336,14 @@ export default class AppTile extends React.Component {
      * Called when widget iframe has finished loading
      */
     _onLoaded() {
-        if (!ActiveWidgetStore.getWidgetMessaging(this.props.id)) {
-            this._setupWidgetMessaging();
+        // Destroy the old widget messaging before starting it back up again. Some widgets
+        // have startup routines that run when they are loaded, so we just need to reinitialize
+        // the messaging for them.
+        if (ActiveWidgetStore.getWidgetMessaging(this.props.id)) {
+            ActiveWidgetStore.delWidgetMessaging(this.props.id);
         }
+        this._setupWidgetMessaging();
+
         ActiveWidgetStore.setRoomId(this.props.id, this.props.room.roomId);
         this.setState({loading: false});
     }