[Webkit-unassigned] [Bug 179682] Incorrect bounds inside <mover>/<munder> when a stretchy operator is present

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=179682

Minsheng Liu <lambda at liu.ms> changed:

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--- Comment #18 from Minsheng Liu <lambda at liu.ms> ---
Created attachment 327719

  --> https://bugs.webkit.org/attachment.cgi?id=327719&action=review

the algorithm in action (just for visual comparison, not a patch to review)

I add a helper variable to RenderMathMLOperator to lock the stretch width of those operators. The motivation should hopefully be lucid: after stretching the operator and re-layout its ancestors, the recursive call will automatically revert the stretched width, an undesired behavior.

The other trick is that I set stretchWidth to base()’s width in the second loop. It is a bit tricky (I am not sure if such code is welcome here for WebKit) but it reduces code reduplication.

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