[Webkit-unassigned] [Bug 160077] New: Painting issues with menclose and reflow / repaint

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=160077

            Bug ID: 160077
           Summary: Painting issues with menclose and reflow / repaint
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: MathML
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fred.wang at free.fr
                CC: alex at igalia.com, distler at golem.ph.utexas.edu,
                    rego at igalia.com

Created attachment 284311
  --> https://bugs.webkit.org/attachment.cgi?id=284311&action=review
Testcase Dirac Equation

The following issue has been reported by Jacques Distler on his Instiki sandbox page: "Multiple missing symbols in the Dirac Equation.". I'm not exactly sure when it happens, it seems that his page currently uses MathJax for WebKit, which might causing unnecessary reflow or style that make the analysis complicated.

I have isolated a testcase, but I'm not sure it is fully reduced (the bug does not show up for a single equation for example). I noticed that changing the CSS font-size or selecting the content causes the 0 or the operators to disappear. It seems that the menclose element is also involved.

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