Merge pull request #119 from crixx/bugfix/rootElementResolution-leads…

…-to-memory-leak-fix

bugfix(rootElementResolution): fixes #118 wrong resolution of rootElement

addon/event_dispatcher.js

@@ -1,10 +1,11 @@
 import { getOwner } from '@ember/application';
 import { merge, assign as _assign } from '@ember/polyfills';
-import { get } from '@ember/object';
+import { get, set } from '@ember/object';
 import Ember from 'ember';
 import defaultHammerEvents from './hammer-events';
 import dasherizedToCamel from './utils/string/dasherized-to-camel';
 import mobileDetection from './utils/is-mobile';
+import { isNone } from '@ember/utils';
 
 const {
   EventDispatcher,
@@ -159,6 +160,10 @@ export default EventDispatcher.extend({
     let additionalEvents = assign({}, addedEvents);
     additionalEvents = assign(additionalEvents, this.get('_gestures'));
 
+    if (!isNone(rootElement)) {
+      set(this, 'rootElement', rootElement);
+    }
+
     this._fastFocus();
 
     return this._super(additionalEvents, rootElement);