Wayland: suport GTK/CSS cursor names

[alebastr]

Adwaita, the default icon theme for many distributions, decided to stop providing legacy Xcursor icons in favor of the GTK/CSS names1. This requires us to probe for "default" instead of the "left_ptr", as the latter is no longer available in Adwaita.
Keep the fallback to "left_ptr" for more conservative themes.

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Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.46%. Comparing base (9a437ab) to head (ccc8540).
⚠️ Report is 354 commits behind head on master.

Files with missing lines	Patch %	Lines
src/wayland/wl.c	0.00%	4 Missing ⚠️
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@@            Coverage Diff             @@
##           master    #1276      +/-   ##
==========================================
- Coverage   64.48%   64.46%   -0.02%     
==========================================
  Files          48       48              
  Lines        7918     7920       +2     
==========================================
  Hits         5106     5106              
- Misses       2812     2814       +2     

Flag	Coverage Δ
unittests	64.46% <0.00%> (-0.02%)	⬇️

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[bynect]

I was wondering if it isn't better to first check for left_ptr and use default as a fallback. Because I was searching around and SDL checks first for left_ptr.

[alebastr]

Doesn't really matter, left_ptr and default should be equivalent in all the themes that have both (that's any cursor theme updated within the past decade).

I've seen both orders in major projects, and some projects don't even have a fallback to left_ptr.

[bynect]

Thanks for the information, I'll merge the pr 👍🏻

Also, sorry to bother you but I am not really familiar with the wayland output. Do you know if/how to support for transparent colors in wayland? Is it already working?

[alebastr]

Also, sorry to bother you but I am not really familiar with the wayland output. Do you know if/how to support for transparent colors in wayland? Is it already working?

It works if you specify the colors in RGBA format. E.g. notify-send -h string:bgcolor:#0000007f ...