gtk: apply all window appearance changes in syncAppearance #5404
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The GTK side of appearance code is kind of a mess with several different functions all having the responsibility of interacting with each other and setting the appropriate window appearance. It should solely be the responsibility of the
syncAppearance
function to apply appearance changes, with other callbacks/functions calling it instead: much like what we already do for the macOS apprt.I also took the time to refactor the libadwaita version checks since calling
versionAtLeast(0, 0, 0)
does get old after a while. Now almost all checks are given human-readable names and contributors need not memorize what the relevant version checks all are.