Neil Roberts d306b4bb7d clutter-offscreen-effect: Preserve the old opacity override
When removing the opacity override in the post_paint implementation,
ClutterOffscreenEffect would always set the override back to -1. This
ends up cancelling out the effect of any overrides from outer effects
which means that if any actor has multiple effects attached then it
would apply the opacity multiple times.

To fix this, the effect now preserves the old value of the opacity
override and restores that instead of setting -1.

http://bugzilla.clutter-project.org/show_bug.cgi?id=2541
2011-03-03 16:54:52 +00:00
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