FIX: Menu panels scrolled weird in iOS

app/assets/javascripts/discourse/components/menu-panel.js.es6

@@ -79,7 +79,11 @@ export default Ember.Component.extend({
       });
       this.performLayout();
       this._watchSizeChanges();
+
+      // iOS does not handle scroll events well
+      if (!this.capabilities.touch) {
         $(window).on('scroll.discourse-menu-panel', () => this.performLayout());
+      }
     } else {
       Ember.run.scheduleOnce('afterRender', () => this.sendAction('onHidden'));
       $('html').off('click.close-menu-panel');