Kovid Goyal 4f90110a7c
Fix ghosting when using background_tint under GNOME+Wayland
The problem was that on Wayland if the buffer contains pixels with alpha
< 1 they are blended with something, even if the window is opaque. Under
mutter that something was the previous frame, under sway it was the
background/whatever is under the window.

So when blending the tint color, use a blend mode that results in opaque
pixels.

Fixes #5605
2022-10-19 19:02:05 +05:30
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