24f44aa33e
It was missing a cairo_region_t. This also needs adapting the test case, since prior to this, we didn't actually bump the paint counter when painting. When a scanout test isn't waiting to go from compositing to scanout, but from scanout to compositing, we should not early out when we actually composited, since that's what we're expecting to see. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2795>