Revert "Change isBlock and isInline functions to check for isElementNode"

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 291 matching lines @@
     if (p.deprecatedNode() && p.deprecatedNode() != highestRoot && !p.deprecatedNode()->isDescendantOf(highestRoot))
         return VisiblePosition();
 
     return VisiblePosition(p);
 }
 
 // FIXME: The method name, comment, and code say three different things here!
 // Whether or not content before and after this node will collapse onto the same line as it.
 bool isBlock(const Node* node)
 {
-    return node && node->isElementNode() && node->renderer() && !node->renderer()->isInline() && !node->renderer()->isRubyText();
+    return node && node->renderer() && !node->renderer()->isInline() && !node->renderer()->isRubyText();
 }
 
 bool isInline(const Node* node)
 {
-    return node && node->isElementNode() && node->renderer() && node->renderer()->isInline();
+    return node && node->renderer() && node->renderer()->isInline();
 }
 
 // FIXME: Deploy this in all of the places where enclosingBlockFlow/enclosingBlockFlowOrTableElement are used.
 // FIXME: Pass a position to this function. The enclosing block of [table, x] for example, should be the
 // block that contains the table and not the table, and this function should be the only one responsible for
 // knowing about these kinds of special cases.
 Element* enclosingBlock(Node* node, EditingBoundaryCrossingRule rule)
 {
     Node* enclosingNode = enclosingNodeOfType(firstPositionInOrBeforeNode(node), isBlock, rule);
-    return toElement(enclosingNode);
+    return enclosingNode && enclosingNode->isElementNode() ? toElement(enclosingNode) : 0;
 }
 
 TextDirection directionOfEnclosingBlock(const Position& position)
 {
     Node* enclosingBlockNode = enclosingBlock(position.containerNode());
     if (!enclosingBlockNode)
         return LTR;
     RenderObject* renderer = enclosingBlockNode->renderer();
     return renderer ? renderer->style()->direction() : LTR;
 }
@@ skipping 780 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