Merge 98492 - REGRESSION (r94887): Scrolling the HTML spec is more jerky now than it was (regress...

Source/WebCore/css/CSSStyleSelector.cpp

Index: Source/WebCore/css/CSSStyleSelector.cpp
===================================================================
--- Source/WebCore/css/CSSStyleSelector.cpp	(revision 98492)
+++ Source/WebCore/css/CSSStyleSelector.cpp	(working copy)
@@ -889,9 +889,6 @@
     if (style->transitions() || style->animations())
         return false;
 
-    if (style->affectedByDirectAdjacentRules())
-        return false;
-
 #if USE(ACCELERATED_COMPOSITING)
     // Turn off style sharing for elements that can gain layers for reasons outside of the style system.
     // See comments in RenderObject::setStyle().
@@ -931,7 +928,8 @@
 {
     return parentStyle->childrenAffectedByPositionalRules() 
         || parentStyle->childrenAffectedByFirstChildRules()
-        || parentStyle->childrenAffectedByLastChildRules();
+        || parentStyle->childrenAffectedByLastChildRules() 
+        || parentStyle->childrenAffectedByDirectAdjacentRules();
 }
 
 RenderStyle* CSSStyleSelector::locateSharedStyle()