MAGETWO-31191: Page JS dependencies optimization

 - Add triggering 'contentUpdated' event to category/edit.phtml

Author: Mykhailo Miroshnikov

app/code/Magento/Catalog/view/adminhtml/templates/catalog/category/edit.phtml

@@ -89,6 +89,7 @@ require([
                         $('.page-actions').floatingHeader({
                             'title': '.category-edit-title'
                         });
+                        $('body').trigger('contentUpdated');
                         try {
                             if (refreshTree) {
                                 window.refreshTreeArea();