Invalidate previousLocationInBacking in LayoutObject::clearPreviousVisualRects()

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  *               (http://www.torchmobile.com/)
@@ skipping 1240 matching lines @@
 
 void LayoutObject::adjustPreviousPaintInvalidationForScrollIfNeeded(
     const DoubleSize& scrollDelta) {
   if (containerForPaintInvalidation().usesCompositedScrolling())
     return;
   m_previousVisualRect.move(LayoutSize(scrollDelta));
 }
 
 void LayoutObject::clearPreviousVisualRects() {
   setPreviousVisualRect(LayoutRect());
-  // After clearing ("invalidating" the visual rects, mark this object as
+  ObjectPaintInvalidator(*this).setPreviousLocationInBacking(LayoutPoint());
+  // Ensure check paint invalidation of subtree that would be triggered by
+  // location change if we had valid previous location.
+  setMayNeedPaintInvalidationSubtree();
+  // After clearing ("invalidating") the visual rects, mark this object as
   // needing to re-compute them.
   setShouldDoFullPaintInvalidation();
 }
 
 LayoutRect LayoutObject::absoluteVisualRect() const {
   LayoutRect rect = localVisualRect();
   mapToVisualRectInAncestorSpace(view(), rect);
   return rect;
 }
 
@@ skipping 2275 matching lines @@
     const blink::LayoutObject* root = object1;
     while (root->parent())
       root = root->parent();
     root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
   } else {
     WTFLogAlways("%s", "Cannot showLayoutTree. Root is (nil)");
   }
 }
 
 #endif