Bug#593844: iceweasel: Microsoft Psychedelic Browsing test doesn't work

[Mike Hommey]

On Sun, Aug 22, 2010 at 01:13:52PM +0200, Mike Hommey wrote:
> On Sat, Aug 21, 2010 at 04:31:49PM +0200, Vincent Lefevre wrote:
> > Package: iceweasel
> > Version: 3.5.11-1
> > Severity: normal
> > 
> > The test
> > 
> >   http://ie.microsoft.com/testdrive/Performance/PsychedelicBrowsing/
> > 
> > doesn't work: when I click on "Find Out", the text disappears, but
> > then the window remains blank (with only "Return to Test Drive Demos"
> > at the top right). The wheel should appear, but it doesn't.
> > 
> > I have no such problem with
> >   _ Chromium browser (Debian's chromium-browser package) on the same
> >     machine,
> >   _ Firefox 3.6.8 under Mac OS X.
> > 
> > I don't really want to test the experimental version.
> 
> It works if I rebuild xulrunner with the embedded cairo version.
> Interestingly, it doesn't if I upgrade cairo to the version in
> experimental. Either compiling vs. cairo 1.9.x changes something or one
> of the patches applied by mozilla fixes something.

I found which patch in the mozilla codebase makes it work[1].

According to the corresponding bug[2], there are various other cases
that this patch fixes.

This is a shared issue between cairo and the mozilla codebase. It looks
like the mozilla codebase shouldn't be using 0x0 matrices, but does.
OTOH, it looks like the fix is much easier on cairo's end.

CCing cairo maintainer, I'd be interesting to know what he thinks.

Cheers,

Mike

1. https://bugzilla.mozilla.org/attachment.cgi?id=359928&action=diff
2. https://bugzilla.mozilla.org/show_bug.cgi?id=474886