fb30822860
Applying the "dim window" effect to the MetaWindowActor has two avantages: first it avoids triggering bugs where ClutterOffscreenEffect doesn't handle clone paint correctly. Second, it avoids showing the window as dimmed in alt-Tab and the overview, which is weird. The small downside of this is that the shadow becomes slightly gray when the window dimmed, which is wrong - if we switched from blending with gray to a combination of desaturation and darkening, this problem wouldn't happen. Revert out the addition of startY to the shader, since we don't need it and fix the application of alpha, since we need to handle alpha correctly for the shadow. https://bugzilla.gnome.org/show_bug.cgi?id=659634
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