Hi,

Ray has spend weeks trying to find the regression cause of this bug
https://bugzilla.mozilla.org/show_bug.cgi?id=1267935

The box size of some XUL elements are rendered incorrectly as soon as bug
1267935 got uplifted to Aurora 48.

Before: https://bugzilla.mozilla.org/attachment.cgi?id=8739374
After: https://bugzilla.mozilla.org/attachment.cgi?id=8745882

So far Ray has identify the regression commit to be the one that simply
sets the version from 48a1 to 48a2 -- I suspect we are unfortunately
hitting a XUL/layout behavior that is only enabled on Nightly, but it's not
easy to identify what that would be.

Is there a more effective way to know figure out what that it? What's the
recommendation to move this forward -- should Ray fix the XUL layout so
that it would work on Aurora 48 w/o finding the XUL behavior we have
encountered?

Thanks,


Tim
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