Fix problems when renaming and entering a directory fast in Files.app.

chrome/browser/resources/file_manager/js/sidebar.js

 // Copyright (c) 2013 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.
 
 'use strict';
 
 // TODO(yoshiki): rename this sidebar.js to directory_tree.js.
 
 ////////////////////////////////////////////////////////////////////////////////
 // DirectoryTreeUtil
@@ skipping 355 matching lines @@
 
   if (parentDirItem.expanded)
     this.updateSubDirectories(false /* recursive */);
 };
 
 /**
  * Overrides WebKit's scrollIntoViewIfNeeded, which doesn't work well with
  * a complex layout. This call is not necessary, so we are ignoring it.
  *
  * @param {boolean} unused Unused.
+ * @override
  */
 DirectoryItem.prototype.scrollIntoViewIfNeeded = function(unused) {
 };
 
 /**
+ * Removes the child node, but without selecting the parent item, to avoid
+ * unintended changing of directories. Removing is done externally, and other
+ * code will navigate to another directory.
+ *
+ * @param {!cr.ui.TreeItem} child The tree item child to remove.
+ * @override
+ */
+DirectoryItem.prototype.remove = function(child) {
+  this.lastElementChild.removeChild(child);
+  if (this.items.length == 0)
+    this.hasChildren = false;
+};
+
+/**
  * Invoked when the item is being expanded.
  * @param {!UIEvent} e Event.
  * @private
  **/
 DirectoryItem.prototype.onExpand_ = function(e) {
   this.updateSubDirectories(
       true /* recursive */,
       function() {},
       function() {
         this.expanded = false;
@@ skipping 378 matching lines @@
     cr.dispatchSimpleEvent(this, 'content-updated');
   }
 };
 
 /**
  * Updates the UI after the layout has changed.
  */
 DirectoryTree.prototype.relayout = function() {
   cr.dispatchSimpleEvent(this, 'relayout');
 };