scene: Simplify the management of opaque regions
Window painting is no longer split in two phases - PAINT_WINDOW_OPAQUE and PAINT_WINDOW_TRANSLUCENT. PAINT_WINDOW_TRANSLUCENT is used as a hint to the occlusion culling logic to ignore the opaque region. Given that, the handling of the opaque region can be simplified. If no effect sets the PAINT_WINDOW_TRANSLUCENT flag, then the opaque region can be used as is.
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