MD Bookmarks: Update Delete command to only delete the minimal set of nodes

chrome/test/data/webui/md_bookmarks/command_manager_test.js

 // Copyright 2017 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.
 
 suite('<bookmarks-command-manager>', function() {
   var commandManager;
   var store;
   var lastCommand;
   var lastCommandIds;
 
   function assertLastCommand(command, ids) {
     assertEquals(lastCommand, command);
     if (ids)
       assertDeepEquals(normalizeSet(lastCommandIds), ids);
     lastCommand = null;
     lastCommandIds = null;
   }
 
   suiteSetup(function() {
     // Overwrite bookmarkManagerPrivate APIs which will crash if called with
     // fake data.
     chrome.bookmarkManagerPrivate.copy = function() {};
     chrome.bookmarkManagerPrivate.removeTrees = function() {};
   });
 
   setup(function() {
     store = new bookmarks.TestStore({
-      nodes: testTree(createFolder(
-          '1',
-          [
-            createFolder('11', []),
-            createFolder('12', []),
-            createItem('13'),
-          ])),
+      nodes: testTree(
+          createFolder(
+              '1',
+              [
+                createFolder(
+                    '11',
+                    [
+                      createItem('111'),
+                    ]),
+                createFolder('12', []),
+                createItem('13'),
+              ]),
+          createFolder('2', [])),
     });
     bookmarks.Store.instance_ = store;
 
     commandManager = document.createElement('bookmarks-command-manager');
 
     var realHandle = commandManager.handle.bind(commandManager);
     commandManager.handle = function(command, itemIds) {
       lastCommand = command;
       lastCommandIds = itemIds;
       realHandle(command, itemIds);
@@ skipping 59 matching lines @@
   test('edit command triggers', function() {
     var key = cr.isMac ? 'Enter' : 'F2';
     var keyCode = cr.isMac ? 13 : 113;
 
     store.data.selection.items = new Set(['11']);
     store.notifyObservers();
 
     MockInteractions.pressAndReleaseKeyOn(document, keyCode, '', key);
     assertLastCommand('edit', ['11']);
   });
+
+  test('does not delete children at same time as ancestor', function() {
+    var lastDelete = null;
+    chrome.bookmarkManagerPrivate.removeTrees = function(idArray) {
+      lastDelete = idArray.sort();
+    };
+
+    var parentAndChildren = new Set(['1', '2', '12', '111']);
+    assertTrue(commandManager.canExecute(Command.DELETE, parentAndChildren));
+    commandManager.handle(Command.DELETE, parentAndChildren);
+
+    assertDeepEquals(['1', '2'], lastDelete);
+  });
 });