Reviewed by john

        * editing/execCommand/create-list-with-hr-expected.checksum: Added.
        * editing/execCommand/create-list-with-hr-expected.png: Added.
        * editing/execCommand/create-list-with-hr-expected.txt: Added.
        * editing/execCommand/create-list-with-hr.html: Added.

WebCore:

        Reviewed by john
        
        <rdar://problem/4755287>
        Writely Editor: Crash occurs at WebCore::maxDeepOffset(WebCore::Node const*) when attempting to create a OL/UL following a HR element

        * editing/markup.cpp:
        (WebCore::createMarkup): Migrate to isBlock (isBlockFlow is true for inline replaced 
        elements).  Don't skip blocks that aren't containers (like horizontal rules).



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@16728 268f45cc-cd09-0410-ab3c-d52691b4dbfc