Separate repaint and layout requirements of StyleDifference (Step 1)

Source/core/editing/SimplifyMarkupCommand.cpp

 /*
  * Copyright (C) 2012 Apple Computer, Inc.  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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 58 matching lines @@
                 break;
 
             if (!currentNode->renderer() || !currentNode->renderer()->isRenderInline() || toRenderInline(currentNode->renderer())->alwaysCreateLineBoxes())
                 continue;
 
             if (currentNode->firstChild() != currentNode->lastChild()) {
                 topNodeWithStartingStyle = 0;
                 break;
             }
 
-            unsigned context;
-            if (currentNode->renderStyle()->visualInvalidationDiff(*startingStyle, context) == StyleDifferenceEqual && !context)
+            if (currentNode->renderStyle()->visualInvalidationDiff(*startingStyle).hasNoChange())
                 topNodeWithStartingStyle = currentNode;
 
         }
         if (topNodeWithStartingStyle) {
             for (Node* node = startingNode; node != topNodeWithStartingStyle; node = node->parentNode())
                 nodesToRemove.append(node);
         }
     }
 
     // we perform all the DOM mutations at once.
@@ skipping 25 matching lines @@
         return 0;
 
     removeNode(nodesToRemove[startNodeIndex], AssumeContentIsAlwaysEditable);
     insertNodeBefore(nodesToRemove[startNodeIndex], highestAncestorToRemove, AssumeContentIsAlwaysEditable);
     removeNode(highestAncestorToRemove, AssumeContentIsAlwaysEditable);
 
     return pastLastNodeToRemove - startNodeIndex - 1;
 }
 
 } // namespace WebCore