Clear scroll anchor on all parent scrollers from ScrollAnchor::clear

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 2692 matching lines @@
 
   if (RuntimeEnabledFeatures::scrollAnchoringEnabled() &&
       m_bitfields.isScrollAnchorObject()) {
     // Clear the bit first so that anchor.clear() doesn't recurse into
     // findReferencingScrollAnchors.
     m_bitfields.setIsScrollAnchorObject(false);
     findReferencingScrollAnchors(this, Clear);
   }
 }
 
-void LayoutObject::maybeClearIsScrollAnchorObject() {
-  if (m_bitfields.isScrollAnchorObject())
-    m_bitfields.setIsScrollAnchorObject(
-        findReferencingScrollAnchors(this, DontClear));
+void LayoutObject::clearIsScrollAnchorObject(bool unconditionally) {
+  if (!m_bitfields.isScrollAnchorObject())
+    return;
+
+  if (unconditionally) {
+    m_bitfields.setIsScrollAnchorObject(false);
+    return;
+  }
+  m_bitfields.setIsScrollAnchorObject(
+      findReferencingScrollAnchors(this, DontClear));
 }
 
 void LayoutObject::removeFromLayoutFlowThread() {
   if (!isInsideFlowThread())
     return;
 
   // Sometimes we remove the element from the flow, but it's not destroyed at
   // that time.
   // It's only until later when we actually destroy it and remove all the
   // children from it.
@@ skipping 806 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