Make first-letter style to work with editing

Source/core/editing/FrameSelection.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 243 matching lines @@
     void updateSelectionIfNeeded(const Position& base, const Position& extent, const Position& start, const Position& end);
 
     Frame* m_frame;
 
     LayoutUnit m_xPosForVerticalArrowNavigation;
 
     VisibleSelection m_selection;
     VisiblePosition m_originalBase; // Used to store base before the adjustment at bidi boundary
     TextGranularity m_granularity;
 
-    RefPtr<Node> m_previousCaretNode; // The last node which painted the caret. Retained for clearing the old caret when it moves.
+    Position m_previousCaretPosition; // The last position which painted the caret. Retained for clearing the old caret when it moves.
 
     RefPtr<EditingStyle> m_typingStyle;
 
     Timer<FrameSelection> m_caretBlinkTimer;
     // The painted bounds of the caret in absolute coordinates
     IntRect m_absCaretBounds;
     bool m_absCaretBoundsDirty : 1;
     bool m_caretPaint : 1;
     bool m_isCaretBlinkingSuspended : 1;
     bool m_focused : 1;
@@ skipping 16 matching lines @@
 }
 } // namespace WebCore
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const WebCore::FrameSelection&);
 void showTree(const WebCore::FrameSelection*);
 #endif
 
 #endif // FrameSelection_h