Migrate Discourse Polls to use vdom instead of embedded ember

app/assets/javascripts/discourse/components/mount-widget.js.es6

@@ -110,6 +110,7 @@ export default Ember.Component.extend({
       const opts = { model: this.get('model') };
       const newTree = new this._widgetClass(args, this.register, opts);
 
+      newTree._rerenderable = this;
       newTree._emberView = this;
       const patches = diff(this._tree || this._rootNode, newTree);
 

app/assets/javascripts/discourse/widgets/glue.js.es6

@@ -0,0 +1,43 @@
+import { diff, patch } from 'virtual-dom';
+import { queryRegistry } from 'discourse/widgets/widget';
+
+export default class WidgetGlue {
+
+  constructor(name, register, attrs) {
+    this._tree = null;
+    this._rootNode = null;
+    this.register = register;
+    this.attrs = attrs;
+    this._timeout = null;
+
+    this._widgetClass = queryRegistry(name) || this.register.lookupFactory(`widget:${name}`);
+    if (!this._widgetClass) {
+      console.error(`Error: Could not find widget: ${name}`);
+    }
+  }
+
+  appendTo(elem) {
+    this._rootNode = elem;
+    this.queueRerender();
+  }
+
+  queueRerender() {
+    this._timeout = Ember.run.scheduleOnce('render', this, this.rerenderWidget);
+  }
+
+  rerenderWidget() {
+    Ember.run.cancel(this._timeout);
+    const newTree = new this._widgetClass(this.attrs, this.register);
+    const patches = diff(this._tree || this._rootNode, newTree);
+
+    newTree._rerenderable = this;
+    this._rootNode = patch(this._rootNode, patches);
+    this._tree = newTree;
+  }
+
+  cleanUp() {
+    Ember.run.cancel(this._timeout);
+  }
+}
+
+

app/assets/javascripts/discourse/widgets/widget.js.es6

@@ -246,10 +246,11 @@ export default class Widget {
         keyDirty(widget.key);
       }
 
-      const emberView = widget._emberView;
-      if (emberView) {
-        return emberView.queueRerender();
+      const rerenderable = widget._rerenderable;
+      if (rerenderable) {
+        return rerenderable.queueRerender();
       }
+
       widget = widget.parentWidget;
     }
   }