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How far away is GIMP 3 from GIMP 4?
(www.gimp.org)
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If I had to guess when GIMP will be native GTK 4 I'd say no sooner than five years, more likely it'll be 10. By the time GIMP runs on GTK 4 we'll be working with GTK 5 or 6.
I don't know how long it will take but it should be much much less work now that gnarly UI elements as old as GTK have been replaced with modern toolkit ones.