reset VisibleSelection at the Undo command.

Source/core/dom/Range.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Gunnstein Lye (gunnstein@netcom.no)
  * (C) 2000 Frederik Holljen (frederik.holljen@hig.no)
  * (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Motorola Mobility. 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
@@ skipping 530 matching lines @@
         for (unsigned i = 0; container && i < offset; i++)
             container = container->nextSibling();
     } else {
         while (container->parentNode() != commonRoot)
             container = container->parentNode();
     }
 
     return container;
 }
 
-static inline unsigned lengthOfContentsInNode(Node* node)
+unsigned Range::lengthOfContentsInNode(const Node* node)

[Yuta Kitamura, 2014/06/05 08:37:55]

I don't think this function should be exposed as a member of
Range. It should probably belong to Node.

[yoichio, 2014/06/06 04:49:21]

Done.

 {
     // This switch statement must be consistent with that of Range::processContentsBetweenOffsets.
     switch (node->nodeType()) {
     case Node::TEXT_NODE:
     case Node::CDATA_SECTION_NODE:
     case Node::COMMENT_NODE:
         return toCharacterData(node)->length();
     case Node::PROCESSING_INSTRUCTION_NODE:
         return toProcessingInstruction(node)->data().length();
     case Node::ELEMENT_NODE:
@@ skipping 1129 matching lines @@
 
 void showTree(const WebCore::Range* range)
 {
     if (range && range->boundaryPointsValid()) {
         range->startContainer()->showTreeAndMark(range->startContainer(), "S", range->endContainer(), "E");
         fprintf(stderr, "start offset: %d, end offset: %d\n", range->startOffset(), range->endOffset());
     }
 }
 
 #endif