mac: Bookmark bar drag and drop bug.

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_view.mm

 // Copyright (c) 2011 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.
 
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_view.h"
 
 #include "chrome/browser/bookmarks/bookmark_pasteboard_helper_mac.h"
 #include "chrome/browser/profiles/profile.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_folder_target.h"
@@ skipping 81 matching lines @@
 - (void)draggingEnded:(id<NSDraggingInfo>)info {
   // Awkwardness since views open and close out from under us.
   if (inDrag_) {
     inDrag_ = NO;
   }
 
   [self draggingExited:info];
 }
 
 - (BOOL)wantsPeriodicDraggingUpdates {
-  // TODO(jrg): This should probably return |YES| and the controller should
-  // slide the existing bookmark buttons interactively to the side to make
-  // room for the about-to-be-dropped bookmark.
+  // TODO(jrg): The controller should slide the existing bookmark buttons
+  // interactively to the side to make room for the about-to-be-dropped
+  // bookmark.
   // http://crbug.com/35968
-  return NO;
+
+  // The bookmark_bar_folder_hover_state expects continuous callbacks.
+  return YES;
 }
 
 - (NSDragOperation)draggingUpdated:(id<NSDraggingInfo>)info {
   // For now it's the same as draggingEntered:.
   // TODO(jrg): once we return YES for wantsPeriodicDraggingUpdates,
   // this should ping the [self controller] to perform animations.
   // http://crbug.com/35968
   return [self draggingEntered:info];
 }
 
@@ skipping 80 matching lines @@
     [dropIndicator_ setBorderType:NSLineBorder];
     [dropIndicator_ setAlphaValue:0.85];
     [self addSubview:dropIndicator_];
   } else {
     [dropIndicator_ removeFromSuperview];
     dropIndicator_.reset();
   }
 }
 
 @end