document.querySelector[All]() should check selector context

Source/core/dom/SelectorQuery.cpp

 /*
  * Copyright (C) 2011, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Samsung Electronics. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 104 matching lines @@
         m_crossesTreeBoundary |= selectorList.selectorCrossesTreeScopes(index);
         m_needsUpdatedDistribution |= selectorList.selectorNeedsUpdatedDistribution(index);
     }
 }
 
 inline bool SelectorDataList::selectorMatches(const CSSSelector& selector, Element& element, const ContainerNode& rootNode) const
 {
     SelectorChecker selectorChecker(SelectorChecker::QueryingRules);
     SelectorChecker::SelectorCheckingContext selectorCheckingContext(&element, SelectorChecker::VisitedMatchDisabled);
     selectorCheckingContext.selector = &selector;
-    selectorCheckingContext.scope = !rootNode.isDocumentNode() ? &rootNode : nullptr;
-    if (selectorCheckingContext.scope)
-        selectorCheckingContext.scopeContainsLastMatchedElement = true;
+    selectorCheckingContext.scope = &rootNode;
+    selectorCheckingContext.scopeContainsLastMatchedElement = true;

[esprehn, 2015/08/29 23:55:30]

Why do we need scopeContainsLastMatchedElement at all?

     return selectorChecker.match(selectorCheckingContext);
 }
 
 bool SelectorDataList::matches(Element& targetElement) const
 {
     if (m_needsUpdatedDistribution)
         targetElement.updateDistribution();
 
     unsigned selectorCount = m_selectors.size();
     for (unsigned i = 0; i < selectorCount; ++i) {
@@ skipping 432 matching lines @@
 
     return m_entries.add(selectors, SelectorQuery::adopt(selectorList)).storedValue->value.get();
 }
 
 void SelectorQueryCache::invalidate()
 {
     m_entries.clear();
 }
 
 }