[Webkit-unassigned] [Bug 120164] New: Implement negative width for mspace

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=120164

           Summary: Implement negative width for mspace
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: MathML
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fred.wang at free.fr
                CC: zalan at apple.com, cfleizach at apple.com,
                    gur.trio at gmail.com


Created an attachment (id=209380)
 --> (https://bugs.webkit.org/attachment.cgi?id=209380&action=review)
Experimental Patch

Just opening this bug for the record and attaching an old experimental patch if someone wants to work on this. IIRC, one problem with that patch is that it caused an assert to be raised in the flexbox code. I also tried a simpler version that just removed

if (m_width < 0) {
   m_width = 0;
}

and I think this gave similar results. Both methods provided the expected rendering for the added reftests. One case that is not included in the tests is negative space in table cells:

...
            <mtd>
              <mspace width="2em" height="1em" mathbackground="red"></mspace>
              <mspace width="-1em"/>
              <mspace width="1em" height="1em" mathbackground="blue"></mspace>
            </mtd>
...

that can't work because <mtd> has not a flexbox display but a table-cell display. I think the solution will be to add an anonymous flexbox as a child of the mtd element.

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