Convert cairo canvas group_start/end to pixman
Convert cairo canvas group_start/end to pixman

elmarco/spice,freedesktop-unofficial-mirror/spice__spice,alon/spice-server,elmarco/spice,SPICE/spice,freedesktop-unofficial-mirror/spice__spice,SPICE/spice,Fantu/spice,alon/spice-server,ya-mouse/spice,SPICE/spice,dezelin/spice,Fantu/spice,freedesktop-unofficial-mirror/spice__spice,fgouget/spice,Fantu/spice,mathslinux/spice,alon/spice-server,alon/spice-server,freedesktop-unofficial-mirror/spice__spice,ya-mouse/spice,dezelin/spice,virtualAMP/spiceplay,virtualAMP/spiceplay,virtualAMP/spiceplay,mathslinux/spice,fgouget/spice,freedesktop-unofficial-mirror/spice__spice,mathslinux/spice,Fantu/spice,elmarco/spice,elmarco/spice,dezelin/spice,dezelin/spice,virtualAMP/spiceplay,fgouget/spice,alon/spice-server,fgouget/spice,dezelin/spice,mathslinux/spice,ya-mouse/spice,elmarco/spice,mathslinux/spice