Walk the container chain to correctly find nested inline sticky ancestors.

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 62 matching lines @@
 LayoutBoxModelObject* findFirstStickyBetween(LayoutObject* from,
                                              LayoutObject* to) {
   LayoutObject* maybeStickyAncestor = from;
   while (maybeStickyAncestor && maybeStickyAncestor != to) {
     if (maybeStickyAncestor->isStickyPositioned()) {
       return toLayoutBoxModelObject(maybeStickyAncestor);
     }
 
     maybeStickyAncestor =
         maybeStickyAncestor->isLayoutInline()
-            ? maybeStickyAncestor->containingBlock()
+            ? maybeStickyAncestor->container()
             : toLayoutBox(maybeStickyAncestor)->locationContainer();
   }
   return nullptr;
 }
 }  // namespace
 
 class FloatStateForStyleChange {
  public:
   static void setWasFloating(LayoutBoxModelObject* boxModelObject,
                              bool wasFloating) {
@@ skipping 1374 matching lines @@
   if (rootElementStyle->hasBackground())
     return false;
 
   if (node() != document().firstBodyElement())
     return false;
 
   return true;
 }
 
 }  // namespace blink