Invalidate the previous caret location when editing text nodes.

third_party/WebKit/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 159 matching lines @@
     bool isRange() const { return selection().isRange(); }
     bool isCaretOrRange() const { return selection().isCaretOrRange(); }
     bool isInPasswordField() const;
     bool isDirectional() const { return selection().isDirectional(); }
 
     // If this FrameSelection has a logical range which is still valid, this function return its clone. Otherwise,
     // the return value from underlying VisibleSelection's firstRange() is returned.
     Range* firstRange() const;
 
     void nodeWillBeRemoved(Node&);
+    void dataWillChange(const CharacterData& node);
     void didUpdateCharacterData(CharacterData*, unsigned offset, unsigned oldLength, unsigned newLength);
     void didMergeTextNodes(const Text& oldNode, unsigned offset);
     void didSplitTextNode(const Text& oldNode);
 
     bool isAppearanceDirty() const;
     void commitAppearanceIfNeeded(LayoutView&);
     void updateAppearance();
     void setCaretVisible(bool caretIsVisible);
     bool isCaretBoundsDirty() const { return m_caretRectDirty; }
     void setCaretRectNeedsUpdate();
@@ skipping 149 matching lines @@
 }
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::FrameSelection&);
 void showTree(const blink::FrameSelection*);
 #endif
 
 #endif // FrameSelection_h