community/foot: backport bugfix when used with sway
This adds a quirk that works around rendering bugs in combination with sway. Specifically foot assumes damage to propagate to the surface beneath a subsurface. This matches the behavior of most Wayland compositors, but sway, as of now, falls out of the line here.
See https://github.com/swaywm/sway/issues/6960 for the issue in sway.
See https://codeberg.org/dnkl/foot/commit/3b41379be43a21a00a776d0d136c5d1b2fe4007e for the commit message in foot.