Fix for "Mouseovers follow the cursor even when there's a find bar in the way"

chrome/browser/renderer_host/render_widget_host_view_mac.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.
 
 #include <QuartzCore/QuartzCore.h>
 
 #include "chrome/browser/renderer_host/render_widget_host_view_mac.h"
 
 #include "app/surface/io_surface_support_mac.h"
 #include "base/command_line.h"
@@ skipping 1419 matching lines @@
 
 - (void)setTakesFocusOnlyOnMouseDown:(BOOL)b {
   takesFocusOnlyOnMouseDown_ = b;
 }
 
 - (void)setCloseOnDeactivate:(BOOL)b {
   closeOnDeactivate_ = b;
 }
 
 - (void)mouseEvent:(NSEvent*)theEvent {
+

[Mark Mentovai, 2011/03/23 20:01:25]

Don’t start a function with a blank line.

+  // Use hitTest to check whether we're the frontmost view for this mouse
+  // location. If this is not the frontmost view, don't handle the event
+  // here - let the frontmost view handle it.
+  NSView *contentView = [[self window] contentView];
+  if ([contentView hitTest:[theEvent locationInWindow]] != self)
+    return;
+
   // TODO(rohitrao): Probably need to handle other mouse down events here.
   if ([theEvent type] == NSLeftMouseDown && takesFocusOnlyOnMouseDown_) {
     if (renderWidgetHostView_->render_widget_host_)
       renderWidgetHostView_->render_widget_host_->OnMouseActivate();
 
     // Manually take focus after the click but before forwarding it to the
     // renderer.
     [[self window] makeFirstResponder:self];
   }
 
@@ skipping 1413 matching lines @@
   if (!string) return NO;
 
   // If the user is currently using an IME, confirm the IME input,
   // and then insert the text from the service, the same as TextEdit and Safari.
   [self confirmComposition];
   [self insertText:string];
   return YES;
 }
 
 @end