Make isEditablePosition to work with Position objects other than PositionIsOffsetInAnchor

Source/core/editing/htmlediting.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 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 136 matching lines @@
         if (isHTMLBodyElement(*node))
             break;
         node = node->parentNode();
     }
 
     return 0;
 }
 
 bool isEditablePosition(const Position& p, EditableType editableType, EUpdateStyle updateStyle)
 {
-    Node* node = p.deprecatedNode();
+    Node* node = p.parentAnchoredEquivalent().anchorNode();
     if (!node)
         return false;
     if (updateStyle == UpdateStyle)
         node->document().updateLayoutIgnorePendingStylesheets();
     else
         ASSERT(updateStyle == DoNotUpdateStyle);
 
     if (isRenderedTableElement(node))
         node = node->parentNode();
 
@@ skipping 945 matching lines @@
     // if the selection starts just before a paragraph break, skip over it
     if (isEndOfParagraph(visiblePosition))
         return visiblePosition.next().deepEquivalent().downstream();
 
     // otherwise, make sure to be at the start of the first selected node,
     // instead of possibly at the end of the last node before the selection
     return visiblePosition.deepEquivalent().downstream();
 }
 
 } // namespace WebCore