Recalc sibling styles for forward positional rules on mutations only.

Source/core/dom/Element.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2013 Apple 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
  * License as published by the Free Software Foundation; either
@@ skipping 72 matching lines @@
     ContainsFullScreenElement = 1 << 4,
     IsInTopLayer = 1 << 5,
     HasPendingResources = 1 << 6,
     ChildrenAffectedByFocus = 1 << 7,
     ChildrenAffectedByHover = 1 << 8,
     ChildrenAffectedByActive = 1 << 9,
     ChildrenAffectedByDrag = 1 << 10,
     ChildrenAffectedByFirstChildRules = 1 << 11,
     ChildrenAffectedByLastChildRules = 1 << 12,
     ChildrenAffectedByDirectAdjacentRules = 1 << 13,
-    ChildrenAffectedByForwardPositionalRules = 1 << 14,
-    ChildrenAffectedByBackwardPositionalRules = 1 << 15,
+    ChildrenAffectedByIndirectAdjacentRules = 1 << 14,
+    ChildrenAffectedByForwardPositionalRules = 1 << 15,
+    ChildrenAffectedByBackwardPositionalRules = 1 << 16,
 
     // If any of these flags are set we cannot share style.
     ElementFlagsPreventingStyleSharing =
         ChildrenAffectedByFocus
         | ChildrenAffectedByHover
         | ChildrenAffectedByActive
         | ChildrenAffectedByDrag
         | ChildrenAffectedByFirstChildRules
         | ChildrenAffectedByLastChildRules
         | ChildrenAffectedByDirectAdjacentRules
+        | ChildrenAffectedByIndirectAdjacentRules
         | ChildrenAffectedByForwardPositionalRules
         | ChildrenAffectedByBackwardPositionalRules,
 };
 
 class Element : public ContainerNode {
 public:
     static PassRefPtr<Element> create(const QualifiedName&, Document*);
     virtual ~Element();
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(beforecopy);
@@ skipping 262 matching lines @@
 
     bool childrenAffectedByFirstChildRules() const { return hasElementFlag(ChildrenAffectedByFirstChildRules); }
     void setChildrenAffectedByFirstChildRules() { setElementFlag(ChildrenAffectedByFirstChildRules); }
 
     bool childrenAffectedByLastChildRules() const { return hasElementFlag(ChildrenAffectedByLastChildRules); }
     void setChildrenAffectedByLastChildRules() { setElementFlag(ChildrenAffectedByLastChildRules); }
 
     bool childrenAffectedByDirectAdjacentRules() const { return hasElementFlag(ChildrenAffectedByDirectAdjacentRules); }
     void setChildrenAffectedByDirectAdjacentRules() { setElementFlag(ChildrenAffectedByDirectAdjacentRules); }
 
+    bool childrenAffectedByIndirectAdjacentRules() const { return hasElementFlag(ChildrenAffectedByIndirectAdjacentRules); }
+    void setChildrenAffectedByIndirectAdjacentRules() { setElementFlag(ChildrenAffectedByIndirectAdjacentRules); }
+
     bool childrenAffectedByForwardPositionalRules() const { return hasElementFlag(ChildrenAffectedByForwardPositionalRules); }
     void setChildrenAffectedByForwardPositionalRules() { setElementFlag(ChildrenAffectedByForwardPositionalRules); }
 
     bool childrenAffectedByBackwardPositionalRules() const { return hasElementFlag(ChildrenAffectedByBackwardPositionalRules); }
     void setChildrenAffectedByBackwardPositionalRules() { setElementFlag(ChildrenAffectedByBackwardPositionalRules); }
 
     void setIsInCanvasSubtree(bool value) { setElementFlag(IsInCanvasSubtree, value); }
     bool isInCanvasSubtree() const { return hasElementFlag(IsInCanvasSubtree); }
 
     unsigned childIndex() const { return hasRareData() ? rareDataChildIndex() : 0; }
@@ skipping 534 matching lines @@
     template <> inline bool isElementOfType<const thisType>(const Element& element) { return element.predicate; } \
     DEFINE_NODE_TYPE_CASTS(thisType, predicate)
 
 #define DEFINE_ELEMENT_TYPE_CASTS_WITH_FUNCTION(thisType) \
     template <> inline bool isElementOfType<const thisType>(const Element& element) { return is##thisType(element); } \
     DEFINE_NODE_TYPE_CASTS_WITH_FUNCTION(thisType)
 
 } // namespace
 
 #endif