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Re:The GTK+3 port of GIMP is officially finished by laweijfmvo on Friday April 21, 2023 @01:05PM (#35656803)
I guess I was imagining a scenario where Gnome 55 on Gtk 7 completely breaks compatibility with older Gtk apps and all the distros stopped providing Gtk 2/3 in their repositories and there were conflicts/headaches trying to get it all working.

As long as Gtk continues to have backwards compat, old/unmaintained apps should never just 'stop working'.

Re:The GTK+3 port of GIMP is officially finished by int_19h on Friday April 21, 2023 @04:23PM (#35659543)
But your Gtk2 apps will not work on later versions of Gtk, and most distros are on the track to remove Gtk2 from the repos. So this isn't a hypothetical.

And it will be the same once Gtk3 is phased out: https://docs.gtk.org/gtk4/migrating-3to4.html