[cairo] Quartz regression in release 1.12

[cu]

The error is gone with the patch, thanks!

I'll have another bug reported shortly - that one was in 1.9.8 and still
present in 1.12. It's
a strange rendering issue - essentially when drawing specific polygon
with some of the
lines outside the Quartz image surface, a random line is drawn within
the surface.

Got to isolate it into a reasonably small test case.


Andrea Canciani wrote:
> I already have a (partial) fix for it, but it's still wip.
> If you want to try it, apply the attachment.
>
> Andrea
>
>