Reviewed by harrison
        
        Demonstrates bug:
        * editing/execCommand/5190926-expected.checksum: Added.
        * editing/execCommand/5190926-expected.png: Added.
        * editing/execCommand/5190926-expected.txt: Added.
        * editing/execCommand/5190926.html: Added.
        
        Avoided some nesting:
        * editing/execCommand/5142012-2-expected.txt:
        * editing/execCommand/switch-list-type-expected.txt:

WebCore:

        Reviewed by harrison

        <rdar://problem/5190926> 
        Gmail Editor: Crash when removing list style from underlined, multi-item list
        
        The user underlined some text, then created a list.
        The list was placed inside the inline element carrying 
        the underline style, so, that element surrounded the 
        list instead of being at the lowest level (just above 
        text nodes). This kind of markup is more difficult to 
        edit. Filed 5192089 and added a workaround so that we 
        don't produce this kind of markup.

        * editing/InsertListCommand.cpp:
        (WebCore::InsertListCommand::doApply): Avoid inline
        elements when inserting the new list.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@21534 268f45cc-cd09-0410-ab3c-d52691b4dbfc