AFAIK GIMP only gained GTK 3 support on Nov 2024 and they’re still working on GTK 4.
If this is really GTK 4, they might have forked from GIMP for a while now.
There’s chances this really is a brand new UI on top of GIMP as opposed to just being a layout change and rename, but I guess someone would have to poke at it further to confirm.
AFAIK GIMP only gained GTK 3 support on Nov 2024 and they’re still working on GTK 4.
If this is really GTK 4, they might have forked from GIMP for a while now.
There’s chances this really is a brand new UI on top of GIMP as opposed to just being a layout change and rename, but I guess someone would have to poke at it further to confirm.