Invalidate the previous caret location when editing text nodes.

third_party/WebKit/Source/core/dom/CharacterData.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2013 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 28 matching lines @@
 {
     m_data = AtomicString(m_data);
 }
 
 void CharacterData::setData(const String& data)
 {
     const String& nonNullData = !data.isNull() ? data : emptyString();
     if (m_data == nonNullData)
         return;
 
+    document().dataWillChange(*this);
+
     unsigned oldLength = length();
 
     setDataAndUpdate(nonNullData, 0, oldLength, nonNullData.length(), UpdateFromNonParser);
     document().didRemoveText(this, 0, oldLength);
 }
 
 String CharacterData::substringData(unsigned offset, unsigned count, ExceptionState& exceptionState)
 {
     if (offset > length()) {
         exceptionState.throwDOMException(IndexSizeError, "The offset " + String::number(offset) + " is greater than the node's length (" + String::number(length()) + ").");
@@ skipping 93 matching lines @@
     return m_data.containsOnlyWhitespace();
 }
 
 void CharacterData::setNodeValue(const String& nodeValue)
 {
     setData(nodeValue);
 }
 
 void CharacterData::setDataAndUpdate(const String& newData, unsigned offsetOfReplacedData, unsigned oldLength, unsigned newLength, UpdateSource source, RecalcStyleBehavior recalcStyleBehavior)
 {
+    if (source != UpdateFromParser)
+        document().dataWillChange(*this);
+
     String oldData = m_data;
     m_data = newData;
 
     DCHECK(!layoutObject() || isTextNode());
     if (isTextNode())
         toText(this)->updateTextLayoutObject(offsetOfReplacedData, oldLength, recalcStyleBehavior);
 
     if (source != UpdateFromParser) {
         if (getNodeType() == PROCESSING_INSTRUCTION_NODE)
             toProcessingInstruction(this)->didAttributeChanged();
@@ skipping 26 matching lines @@
     }
     InspectorInstrumentation::characterDataModified(this);
 }
 
 int CharacterData::maxCharacterOffset() const
 {
     return static_cast<int>(length());
 }
 
 } // namespace blink