Rename Node::lastDescendant() / Node::highestAncestor() for clarity

Source/core/editing/ReplaceSelectionCommand.cpp

 /*
  * Copyright (C) 2005, 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009, 2010, 2011 Google 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 1444 matching lines @@
 }
 
 void ReplaceSelectionCommand::updateNodesInserted(Node *node)
 {
     if (!node)
         return;
 
     if (m_startOfInsertedContent.isNull())
         m_startOfInsertedContent = firstPositionInOrBeforeNode(node);
 
-    m_endOfInsertedContent = lastPositionInOrAfterNode(&node->lastDescendant());
+    m_endOfInsertedContent = lastPositionInOrAfterNode(&node->lastDescendantOrSelf());
 }
 
 // During simple pastes, where we're just pasting a text node into a run of text, we insert the text node
 // directly into the text node that holds the selection.  This is much faster than the generalized code in
 // ReplaceSelectionCommand, and works around <https://bugs.webkit.org/show_bug.cgi?id=6148> since we don't
 // split text nodes.
 bool ReplaceSelectionCommand::performTrivialReplace(const ReplacementFragment& fragment)
 {
     if (!fragment.firstChild() || fragment.firstChild() != fragment.lastChild() || !fragment.firstChild()->isTextNode())
         return false;
@@ skipping 20 matching lines @@
         removeNodeAndPruneAncestors(nodeAfterInsertionPos.get());
 
     VisibleSelection selectionAfterReplace(m_selectReplacement ? start : end, end);
 
     setEndingSelection(selectionAfterReplace);
 
     return true;
 }
 
 } // namespace WebCore