2009-04-22  Justin Garcia  <justin.garcia@apple.com>

        Reviewed by Darin Adler.

        https://bugs.webkit.org/show_bug.cgi?id=25322
        Can't delete empty paragraph after a block image
        
        Empty paragraph removal would have been handled by mergeParagraphs, but we stopped short
        because of some code that avoided problems that would arise from Positions that would go
        bad during deletion.  
        
        We have several checks that prevent us from using bad Positions, this one in particular
        was added to avoid bad Positions that result from text removal.  So, I removed the check
        and started correctly updating m_downstreamEnd during text removal so that it doesn't go
        bad.  m_upstreamStart doesn't need to be updated during text removal, since only text
        after it will ever be removed.

        * editing/DeleteSelectionCommand.cpp:
        (WebCore::DeleteSelectionCommand::deleteTextFromNode):
        (WebCore::DeleteSelectionCommand::handleGeneralDelete):
        (WebCore::DeleteSelectionCommand::mergeParagraphs):

LayoutTests:

2009-04-22  Justin Garcia  <justin.garcia@apple.com>

        Reviewed by Darin Adler.
        
        https://bugs.webkit.org/show_bug.cgi?id=25322
        Can't delete empty paragraph after a block image

        * editing/deleting/25322-1-expected.txt: Added.
        * editing/deleting/25322-1.html: Added.
        * editing/deleting/25322-2-expected.txt: Added.
        * editing/deleting/25322-2.html: Added.
        * editing/deleting/25322-3-expected.txt: Added.
        * editing/deleting/25322-3.html: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@42763 268f45cc-cd09-0410-ab3c-d52691b4dbfc