Change hittest node to be scrollbar's parent when hittest include a scrollbar

third_party/WebKit/Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
@@ skipping 6159 matching lines @@
     }
   }
 
   return 0;
 }
 
 // TODO(mustaq) |request| parameter maybe a misuse of HitTestRequest in
 // updateHoverActiveState() since the function doesn't bother with hit-testing.
 void Document::updateHoverActiveState(const HitTestRequest& request,
                                       Element* innerElement,
                                       Scrollbar* hitScrollbar) {

[bokan, 2017/03/31 20:07:00]

You can remove the hitScrollbar parameter now.

   DCHECK(!request.readOnly());
 
   if (request.active() && m_frame)
     m_frame->eventHandler().notifyElementActivated();
 
-  Element* innerElementInDocument = hitScrollbar ? nullptr : innerElement;
-  // Replace the innerElementInDocument to be srollbar's parent when hit
-  // scrollbar
-  if (hitScrollbar) {
-    ScrollableArea* scrollableArea = hitScrollbar->getScrollableArea();
-    if (scrollableArea && scrollableArea->layoutBox() &&
-        scrollableArea->layoutBox()->node() &&
-        scrollableArea->layoutBox()->node()->isElementNode()) {
-      innerElementInDocument =
-          toElement(hitScrollbar->getScrollableArea()->layoutBox()->node());
-    }
-  }
+  Element* innerElementInDocument = innerElement;
 
   while (innerElementInDocument && innerElementInDocument->document() != this) {
     innerElementInDocument->document().updateHoverActiveState(
         request, innerElementInDocument, hitScrollbar);
     innerElementInDocument = innerElementInDocument->document().localOwner();
   }
 
   updateDistribution();
   Element* oldActiveElement = activeHoverElement();
   if (oldActiveElement && !request.active()) {
@@ skipping 466 matching lines @@
 }
 
 void showLiveDocumentInstances() {
   WeakDocumentSet& set = liveDocumentSet();
   fprintf(stderr, "There are %u documents currently alive:\n", set.size());
   for (blink::Document* document : set)
     fprintf(stderr, "- Document %p URL: %s\n", document,
             document->url().getString().utf8().data());
 }
 #endif