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If an effect is active and it overrides the paint volume, we should always recompute the paint volume when requested and not use the cache, since the paint volume override can change from call to call depending on what phase of painting we are in. For instance, if we are part way through painting effects and request the paint volume, the paint volume should only go up to the current effect, but in a later call to compute repaint regions, the paint volume needs to expand to accomadate the effect. This still involves a lot of recomputation in the case of effects - in a later clutter version it would be worth adding an API to allow effects to explicitly recompute and return a new the paint volume up to the current effect as opposed to recomputing the cached one. (cherry picked from commit 5d19aee23a55a642517ec43b116e4452ab0c6cf1)