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st/viewport: Invalidate the cached paint volume of ClutterActor

Jonas Dreßler requested to merge verdre/gnome-shell:cleanup-paint-volumes into master

Since StViewport uses the value of the StAdjustment to create its custom paint volume, ClutterActors newly introduced proper caching of paint volumes doesn't get notifed about changes to that paint volume and will simply reuse the cached old one.

So make use of the newly introduced clutter_actor_invalidate_paint_volume() method to make sure ClutterActor will ask for the paint volume again on the next paint.

Depends on mutter!1773 (merged)

Edited by Jonas Dreßler

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