fix(action bar): attach #comment nodes with _addView (#729)

#comment nodes should be added as views to 'actionBar' since they are anchors for the elements added by structural directive (*ngIf, *ngFor, etc.)

closes #725

nativescript-angular/directives/action-bar.ts

@@ -5,9 +5,9 @@ import { Page } from "tns-core-modules/ui/page";
 import { View } from "tns-core-modules/ui/core/view";
 import { registerElement, ViewClassMeta, NgView } from "../element-registry";
 
-let actionBarMeta: ViewClassMeta = {
+const actionBarMeta: ViewClassMeta = {
     skipAddToDom: true,
-    insertChild: (parent: NgView, child: NgView, _atIndex: number) => {
+    insertChild: (parent: NgView, child: NgView, atIndex: number) => {
         const bar = <ActionBar>(<any>parent);
         const childView = <any>child;
 
@@ -17,13 +17,16 @@ let actionBarMeta: ViewClassMeta = {
         } else if (child instanceof ActionItem) {
             bar.actionItems.addItem(childView);
             childView.parent = bar;
-        } else if (child.nodeName !== "#text" && child instanceof View) {
+        } else if (child.nodeName === "#comment") {
+            bar._addView(childView, atIndex);
+        } else if (child instanceof View) {
             bar.titleView = childView;
         }
     },
     removeChild: (parent: NgView, child: NgView) => {
         const bar = <ActionBar>(<any>parent);
         const childView = <any>child;
+
         if (child instanceof NavigationButton) {
             if (bar.navigationButton === childView) {
                 bar.navigationButton = null;