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xwayland/glamor: Avoid implicit redirection with depth 32 parent windows

Michel Dänzer requested to merge daenzer/xserver:xwayland-glamor-avoid-implicit-redirect into master

Make glamor ensure that a depth 32 pixmap backing a depth 24 window contains fully opaque alpha channel values for the window's pixels, then take advantage of it to avoid implicit redirection in this case, saving pixmap storage and intermediate copies.

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