Outline: add inspector hints to pages again

Some Scout versions ago, the inspector hints were added to the page
so that inspecting the page using browsers dev tool revealed the
model class and class id. This feature broke as the tree node logic
was separated from tree into the class TreeNode without moving
the function responsible for the inspector hints.

eclipse-scout-core/src/desktop/outline/Outline.js

@@ -17,7 +17,6 @@ import {
   Form,
   GroupBoxMenuItemsOrder,
   HtmlComponent,
-  inspector,
   keyStrokeModifier,
   MenuBar,
   menus as menus_1,
@@ -346,16 +345,6 @@ export default class Outline extends Tree {
     });
   }
 
-  /**
-   * @override
-   */
-  _decorateNode(node) {
-    super._decorateNode(node);
-    if (this.session.inspector) {
-      inspector.applyInfo(node, node.$node);
-    }
-  }
-
   // Info: we pass the keyStrokeContext of the parent (table or form) to
   // the created buttons, we cannot use keyStrokeContext of the outline
   // because that context is disabled when the outline is collapsed. We

eclipse-scout-core/src/desktop/outline/pages/Page.js

@@ -8,7 +8,7 @@
  * Contributors:
  *     BSI Business Systems Integration AG - initial API and implementation
  */
-import {icons, MenuBar, Outline, TableRow, TreeNode} from '../../../index';
+import {icons, inspector, MenuBar, Outline, TableRow, TreeNode} from '../../../index';
 import $ from 'jquery';
 
 /**
@@ -146,6 +146,16 @@ export default class Page extends TreeNode {
     this.setDetailForm(form);
   }
 
+  /**
+   * @override
+   */
+  _decorate() {
+    super._decorate();
+    if (this.$node && this.session.inspector) {
+      inspector.applyInfo(this, this.$node);
+    }
+  }
+
   // see Java: AbstractPage#pageActivatedNotify
   activate() {
     this._ensureDetailForm();