I'm pretty sure that's originally a macOS thing. Then some design tools adopted it (probably because designers are in the macOS world). I took this from the screenshot in the linked pull request. No idea what they use, but I assumed macOS. Dunno if any Gnome or KDE themes adopt it.

[–] Safeguard@beehaw.org 0 points 1 month ago (1 children)

I love you. This answer (while I was playing around suggesting I did not recognize it from macOS) is totally how a wonderful human being would respond. Helpful, kind, assuming the best.

You are truly the person this world needs.

[–] Kissaki@programming.dev 0 points 1 month ago* (last edited 1 month ago)

Thank you for the kind words :D

I did not recognize it from macOS

Are you saying it's not from macOS - or at least was not part of the macOS you've actually seen? This thing is many years old, so it wouldn't be a very recent thing.

I don't use or see macOS, though, so my [historical] impression could be wrong (which is why I used subjective/uncertain terminology).

Or by 'suggesting' did you mean you were joking?