Daniel van Vugt ce8af73745 glsl-effect: Don't overwrite the framebuffer's alpha/X channel
It's a waste of effort and will also taint screenshots if they
accidentally store that channel as alpha.

Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/6389
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2650>
2023-04-26 13:42:34 +00:00
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