Make Document::caretRangeFromPoint() to work with :first-letter style

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 1186 matching lines @@
         return 0;
 
     return TreeScope::elementFromPoint(x, y);
 }
 
 PassRefPtr<Range> Document::caretRangeFromPoint(int x, int y)
 {
     if (!renderer())
         return 0;
     LayoutPoint localPoint;
-    Node* node = nodeFromPoint(this, x, y, &localPoint);
-    if (!node)
+    RenderObject* renderer = rendererFromPoint(this, x, y, &localPoint);
+    if (!renderer)
         return 0;
 
+    Node* node = renderer->node();
     Node* shadowAncestorNode = ancestorInThisScope(node);
     if (shadowAncestorNode != node) {
         unsigned offset = shadowAncestorNode->nodeIndex();
         ContainerNode* container = shadowAncestorNode->parentNode();
         return Range::create(*this, container, offset, container, offset);
     }
 
-    RenderObject* renderer = node->renderer();
-    if (!renderer)
-        return 0;
     PositionWithAffinity positionWithAffinity = renderer->positionForPoint(localPoint);
     if (positionWithAffinity.position().isNull())
         return 0;
 
     Position rangeCompliantPosition = positionWithAffinity.position().parentAnchoredEquivalent();
     return Range::create(*this, rangeCompliantPosition, rangeCompliantPosition);
 }
 
 /*
  * Performs three operations:
@@ skipping 4083 matching lines @@
 {
     return DocumentLifecycleNotifier::create(this);
 }
 
 DocumentLifecycleNotifier* Document::lifecycleNotifier()
 {
     return static_cast<DocumentLifecycleNotifier*>(ScriptExecutionContext::lifecycleNotifier());
 }
 
 } // namespace WebCore