actor: Top-levels should always report a 255 opacity
actor: Top-levels should always report a 255 opacity

The paint opacity should always assume a fully opaque top-level at the
end, otherwise the scene would be rendered fully transparent.

http://bugzilla.clutter-project.org/show_bug.cgi?id=2050

collects/clutter,djdeath/clutter-android,collects/clutter,djdeath/clutter-android,kerrickstaley/clutter-vala,dlespiau/clutter,djdeath/clutter,spatulasnout/clutter,nobled/clutter,djdeath/clutter,GNOME/clutter,GNOME/clutter,heysion/clutter-clone,djdeath/clutter-multithreaded,jigpu/clutter,djdeath/clutter-android,GNOME/clutter,spatulasnout/clutter,ebassi/clutter,Distrotech/clutter,ebassi/clutter,Distrotech/clutter,djdeath/clutter,heysion/clutter-clone,jigpu/clutter,dlespiau/clutter,collects/clutter,rkudiyarov/clutter_osx,Distrotech/clutter,Distrotech/clutter,dlespiau/clutter,djdeath/clutter,collects/clutter,ebassi/clutter,heysion/clutter-clone,spatulasnout/clutter,jigpu/clutter,spatulasnout/clutter,jigpu/clutter,rkudiyarov/clutter_osx,heysion/clutter-clone,kerrickstaley/clutter-vala,djdeath/clutter-android,spatulasnout/clutter,rkudiyarov/clutter_osx,djdeath/clutter-multithreaded,kerrickstaley/clutter-vala,rkudiyarov/clutter_osx,djdeath/clutter,heysion/clutter-clone,djdeath/clutter-android,GNOME/clutter,jigpu/clutter,kerrickstaley/clutter-vala,ebassi/clutter,Distrotech/clutter,nobled/clutter,djdeath/clutter-multithreaded,djdeath/clutter,GNOME/clutter,collects/clutter,nobled/clutter,Distrotech/clutter,djdeath/clutter-multithreaded,ebassi/clutter,jigpu/clutter