"ctrl + double click" acts on the highlighted/selected bookmark list items irrespective of on which…

ui/webui/resources/js/cr/ui/list.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // require: array_data_model.js
 // require: list_selection_model.js
 // require: list_selection_controller.js
 // require: list_item.js
 
 /**
@@ skipping 449 matching lines @@
      * @param {Event} e The mouse event object.
      * @private
      */
     handleDoubleClick_: function(e) {
       if (this.disabled)
         return;
 
       var target = /** @type {HTMLElement} */(e.target);
 
       var ancestor = this.getListItemAncestor(target);
-      if (ancestor)
-        this.activateItemAtIndex(this.getIndexOfListItem(ancestor));
+      var index = -1;
+      if (ancestor) {
+        index = this.getIndexOfListItem(ancestor);
+        this.activateItemAtIndex(index);
+      }
+
+      var sm = this.selectionModel;
+      var indexSelected = sm.getIndexSelected(index);
+      if (!indexSelected)
+        this.handlePointerDownUp_(e);
     },
 
     /**
      * Callback for mousedown and mouseup events.
      * @param {Event} e The mouse event object.
      * @private
      */
     handlePointerDownUp_: function(e) {
       if (this.disabled)
         return;
@@ skipping 857 matching lines @@
       if (element.tabIndex >= 0 && !element.disabled)
         return true;
     }
     return false;
   }
 
   return {
     List: List
   };
 });