[cairo] old win32 bug: drawing partial window content

[Maarten Bosmans]

This bug recently hit me too
https://bugs.freedesktop.org/show_bug.cgi?id=28541

Is there any particular reason the patch linked in the bug report
http://sprunge.us/KOZU is not committed. It seems that there was some
discussion on IRC, but I can't find any reasons on the bug comments or
on the mailing list. It would be nice to know what is needed to get
this going.

Maarten