Get rid of false assert from CompositeEditCommand::moveParagraphContentsToNewBlockIfNecessary

Source/core/editing/CompositeEditCommand.cpp

 /*
  * Copyright (C) 2005, 2006, 2007, 2008 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 905 matching lines @@
             // block but don't try and move content into it, since there's nothing for moveParagraphs to move.
             if (!Position::hasRenderedNonAnonymousDescendantsWithHeight(upstreamStart.deprecatedNode()->renderer()))
                 return insertNewDefaultParagraphElementAt(upstreamStart);
         } else if (isBlock(upstreamEnd.deprecatedNode())) {
             if (!upstreamEnd.deprecatedNode()->isDescendantOf(upstreamStart.deprecatedNode())) {
                 // If the paragraph end is a descendant of paragraph start, then we need to run
                 // the rest of this function. If not, we can bail here.
                 return nullptr;
             }
         } else if (enclosingBlock(upstreamEnd.deprecatedNode()) != upstreamStart.deprecatedNode()) {
-            // The visibleEnd.  It must be an ancestor of the paragraph start.
+            // It should be an ancestor of the paragraph start.
             // We can bail as we have a full block to work with.
-            ASSERT(upstreamStart.deprecatedNode()->isDescendantOf(enclosingBlock(upstreamEnd.deprecatedNode())));
             return nullptr;
         } else if (isEndOfEditableOrNonEditableContent(visibleEnd)) {
             // At the end of the editable region. We can bail here as well.
             return nullptr;
         }
     }
 
     if (visibleParagraphEnd.isNull())
         return nullptr;
 
@@ skipping 536 matching lines @@
 
     return node.release();
 }
 
 PassRefPtrWillBeRawPtr<Element> createBlockPlaceholderElement(Document& document)
 {
     return document.createElement(brTag, false);
 }
 
 } // namespace WebCore