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

Source/core/dom/TreeScope.cpp

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  * Copyright (C) 2012 Apple 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
@@ skipping 196 matching lines @@
         return 0;
     if (!m_imageMapsByName)
         return 0;
     size_t hashPos = url.find('#');
     String name = (hashPos == kNotFound ? url : url.substring(hashPos + 1)).impl();
     if (rootNode()->document().isHTMLDocument())
         return toHTMLMapElement(m_imageMapsByName->getElementByLowercasedMapName(AtomicString(name.lower()).impl(), this));
     return toHTMLMapElement(m_imageMapsByName->getElementByMapName(AtomicString(name).impl(), this));
 }
 
-Node* nodeFromPoint(Document* document, int x, int y, LayoutPoint* localPoint)
+RenderObject* rendererFromPoint(Document* document, int x, int y, LayoutPoint* localPoint)
 {
     Frame* frame = document->frame();
 
     if (!frame)
         return 0;
     FrameView* frameView = frame->view();
     if (!frameView)
         return 0;
 
     float scaleFactor = frame->pageZoomFactor();
     IntPoint point = roundedIntPoint(FloatPoint(x * scaleFactor  + frameView->scrollX(), y * scaleFactor + frameView->scrollY()));
 
     if (!frameView->visibleContentRect().contains(point))
         return 0;
 
     HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::DisallowShadowContent);
     HitTestResult result(point);
     document->renderView()->hitTest(request, result);
 
     if (localPoint)
         *localPoint = result.localPoint();
 
-    return result.innerNode();
+    return result.renderer();
 }
 
 Element* TreeScope::elementFromPoint(int x, int y) const
 {
-    Node* node = nodeFromPoint(&rootNode()->document(), x, y);
-    if (node && node->isTextNode())
-        node = node->parentNode();
+    RenderObject* renderer = rendererFromPoint(&rootNode()->document(), x, y);
+    if (!renderer)
+        return 0;
+    Node* node = renderer->node();
+    if (!node)
+        return 0;
+    if (node->isPseudoElement() || node->isTextNode())
+        node = node->parentOrShadowHostNode();
     ASSERT(!node || node->isElementNode() || node->isShadowRoot());
     node = ancestorInThisScope(node);
     if (!node || !node->isElementNode())
         return 0;
     return toElement(node);
 }
 
 void TreeScope::addLabel(const AtomicString& forAttributeValue, HTMLLabelElement* element)
 {
     ASSERT(m_labelsByForAttribute);
@@ skipping 236 matching lines @@
             result = element;
         for (ShadowRoot* shadowRoot = element->youngestShadowRoot(); shadowRoot; shadowRoot = shadowRoot->olderShadowRoot()) {
             if (Element* shadowResult = shadowRoot->getElementByAccessKey(key))
                 result = shadowResult;
         }
     }
     return result;
 }
 
 } // namespace WebCore