Patch by Trey Matteson <trey@usa.net>

    Patch by Trey Matteson <trey@usa.net>
        Reviewed by me.

        Fixed http://bugzilla.opendarwin.org/show_bug.cgi?id=4255
          underlines still print too thick

        The real problem here is that we have code that scales a 0 width line to always
        be width=1.0 in device space.  I'm leaving that in for the screen, but when printing
        a width of 0.5 looks good.

        * WebCoreSupport.subproj/WebTextRenderer.m:
        (-[WebTextRenderer drawLineForCharacters:yOffset:width:color:thickness:]):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@9998 268f45cc-cd09-0410-ab3c-d52691b4dbfc