Calculate paint invalidation rect for scrollbars

third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 229 matching lines @@
     }
 
     // Fixed-position is painted using transform. In the case that the object
     // gets the same layout after changing position property, although no
     // re-raster (rect-based invalidation) is needed, display items should
     // still update their paint offset.
     if (oldStyle) {
         bool newStyleIsFixedPosition = style()->position() == FixedPosition;
         bool oldStyleIsFixedPosition = oldStyle->position() == FixedPosition;
         if (newStyleIsFixedPosition != oldStyleIsFixedPosition)
-            invalidateDisplayItemClientForNonCompositingDescendants();
+            invalidateDisplayItemClientsIncludingNonCompositingDescendants(nullptr, PaintInvalidationStyleChange, nullptr);
     }
 
     // The used style for body background may change due to computed style change
     // on the document element because of background stealing.
     // Refer to backgroundStolenForBeingBody() and
     // http://www.w3.org/TR/css3-background/#body-background for more info.
     if (isDocumentElement()) {
         HTMLBodyElement* body = document().firstBodyElement();
         LayoutObject* bodyLayout = body ? body->layoutObject() : nullptr;
         if (bodyLayout && bodyLayout->isBoxModelObject()) {
@@ skipping 802 matching lines @@
     if (rootElementStyle->hasBackground())
         return false;
 
     if (node() != document().firstBodyElement())
         return false;
 
     return true;
 }
 
 } // namespace blink