fix(addon/components/paper-grid-list): adds mutation-observer to detect DOM elements being reordered.

Author: matthewhartstonge

addon/components/paper-grid-list.hbs

@@ -2,6 +2,7 @@
   class={{@class}}
   {{did-insert this.didInsertNode}}
   {{did-update this.didUpdateNode @cols @gutter @rowHeight}}
+  {{mutation-observer this.didUpdateNode}}
   ...attributes
 >
   {{yield (hash tile=(component 'paper-grid-tile' parent=this))}}

tests/integration/components/paper-grid-list-test.js

@@ -1,5 +1,4 @@
-/* eslint-disable prettier/prettier */
-import { module, test, skip } from 'qunit';
+import { module, test } from 'qunit';
 import { setupRenderingTest } from 'ember-qunit';
 import { render, find, waitUntil } from '@ember/test-helpers';
 import hbs from 'htmlbars-inline-precompile';
@@ -335,7 +334,6 @@ module('Integration | Component | paper-grid-list', function (hooks) {
 
     this.tiles.reverseObjects();
     await waitUntil(browserFramesRendered);
-    await waitUntil(() => find('.TWO'));
 
     assert.equal(tilePosition('.ONE'), 3);
     assert.equal(tilePosition('.TWO'), 2);