WebPluginContainerImpl::isRectTopmost: Clip query rect to frame.

Source/web/WebPluginContainerImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2014 Opera Software ASA. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 510 matching lines @@
 
 bool WebPluginContainerImpl::isRectTopmost(const WebRect& rect)
 {
     if (!m_element)
         return false;
 
     LocalFrame* frame = m_element->document().frame();
     if (!frame)
         return false;
 
+    IntRect documentRect(x() + rect.x, y() + rect.y, rect.width, rect.height);
+    // Clip to the frame's visible area.
+    documentRect.intersect(frame->view()->frameRect());
+    if (documentRect.isEmpty())
+        return false;
     // hitTestResultAtPoint() takes a padding rectangle.
     // FIXME: We'll be off by 1 when the width or height is even.
-    IntRect documentRect(x() + rect.x, y() + rect.y, rect.width, rect.height);
     LayoutPoint center = documentRect.center();
     // Make the rect we're checking (the point surrounded by padding rects) contained inside the requested rect. (Note that -1/2 is 0.)
     LayoutSize padding((documentRect.width() - 1) / 2, (documentRect.height() - 1) / 2);
     HitTestResult result = frame->eventHandler().hitTestResultAtPoint(center, HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::ListBased, padding);
     const HitTestResult::NodeSet& nodes = result.listBasedTestResult();
     if (nodes.size() != 1)
         return false;
     return nodes.first().get() == m_element;
 }
 
@@ skipping 425 matching lines @@
     for (size_t i = 0; i < cutOutRects.size(); i++)
         cutOutRects[i].move(-frameRect().x(), -frameRect().y());
 }
 
 bool WebPluginContainerImpl::pluginShouldPersist() const
 {
     return m_webPlugin->shouldPersist();
 }
 
 } // namespace blink