[Webkit-unassigned] [Bug 156542] New: Ensure that RenderMathMLOperator::stretchTo functions are called with stretchy operators that have the correct direction

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=156542

            Bug ID: 156542
           Summary: Ensure that RenderMathMLOperator::stretchTo functions
                    are called with stretchy operators that have the
                    correct direction
    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
            Blocks: 152244

I'm extracting this change from bug 152244.

This has already been done for horizontal stretchy operators in the RenderMathMLUnderOver refactoring (http://trac.webkit.org/changeset/199293)
Let's do that for RenderMathMLRow and vertical stretchy operators too.
We can then add appropriate ASSERT in the RenderMathMLOperator::stretchTo functions.

Note that this change causes test failures for the following dynamic DOM/style tests, probably because some relayout that used to be forced by useless stretchTo called is not done anymore.

mathml/presentation/mo-lspace-rspace-dynamic.html
mathml/presentation/style-changed.html

So the solution from bug 152244 was to be a bit more aggressive with updates, until we better manage such things in the MathML code (bug 156536).

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