Support both `_actions` and `actions` for delegating

app/assets/javascripts/discourse/components/topic-footer-buttons.js.es6

@@ -1,6 +1,7 @@
 import computed from 'ember-addons/ember-computed-decorators';
+import DelegatedActions from 'discourse/mixins/delegated-actions';
 
-export default Ember.Component.extend({
+export default Ember.Component.extend(DelegatedActions, {
   elementId: 'topic-footer-buttons',
 
   // Allow us to extend it
@@ -8,15 +9,7 @@ export default Ember.Component.extend({
 
   init() {
     this._super();
-
-    this._actions = this._actions || {};
-
-    (this.get('topicDelegated') || []).forEach(m => {
-      this._actions[m] = function() {
-        this.sendAction(m);
-      };
-      this.set(m, m);
-    });
+    this.delegateAll(this.get('topicDelegated'));
   },
 
   @computed('topic.details.can_invite_to')

app/assets/javascripts/discourse/mixins/delegated-actions.js.es6

@@ -0,0 +1,16 @@
+
+export const TARGET_NAME = (Ember.VERSION[0] === "2") ? 'actions' : '_actions';
+
+export default Ember.Mixin.create({
+
+  delegateAll(actionNames) {
+    actionNames = actionNames || [];
+
+    this[TARGET_NAME] = this[TARGET_NAME] || {};
+
+    actionNames.forEach(m => {
+      this[TARGET_NAME][m] = function() { this.sendAction(m); };
+      this.set(m, m);
+    });
+  }
+});

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

@@ -1,6 +1,11 @@
-import { WidgetClickHook, WidgetClickOutsideHook, WidgetKeyUpHook, WidgetKeyDownHook, WidgetDragHook } from 'discourse/widgets/hooks';
+import { WidgetClickHook,
+         WidgetClickOutsideHook,
+         WidgetKeyUpHook,
+         WidgetKeyDownHook,
+         WidgetDragHook } from 'discourse/widgets/hooks';
 import { h } from 'virtual-dom';
 import DecoratorHelper from 'discourse/widgets/decorator-helper';
+import { TARGET_NAME } from 'discourse/mixins/delegated-actions';
 
 function emptyContent() { }
 
@@ -266,7 +271,7 @@ export default class Widget {
 
       if (target) {
         // TODO: Use ember closure actions
-        const actions = target._actions || target.actionHooks || {};
+        const actions = target[TARGET_NAME] || target.actionHooks || {};
         const method = actions[actionName];
         if (method) {
           promise = method.call(target, param);

app/assets/javascripts/main_include.js

@@ -25,6 +25,7 @@
 //= require ./discourse/lib/formatter
 //= require ./discourse/lib/eyeline
 //= require ./discourse/mixins/scrolling
+//= require ./discourse/mixins/scrolling
 //= require ./discourse/models/model
 //= require ./discourse/models/rest
 //= require ./discourse/models/badge-grouping