Jonas Ådahl d857edf09c clutter: Remove support for transparent windows
We're only ever a compositor, so we're never asking to be transparent.
Thus remove support for requesting to paint to GLX or EGL displays with
an alpha channel.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1364
2020-08-13 14:45:10 +02:00
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