Comment 1 for bug 1165271

I'm not sure this is a "bug" per se, though I suppose it could be. glmark2 uses an "opaque" clear color (0.0, 0.0, 0.0, 1.0), but if the alpha component of the glmark2 buffer ends up < 1.0, I assume Weston will blend it with whatever is "underneath" it in the window stack, right? In that case, I would argue intended behavior.