I suggest this because occasionally I get odd (and non-reproducible) GUI-glitches in Geany.

This shouldn't have much to do with the GTK version itself, GTK2 is very stable and should work just fine pretty much everywhere.

Then perhaps my issues are related to something else.

Not necessarily either; if your Geany is built against GTK2 it'll use GTK2, not GTK3. To get Geany to use GTK3 you need to build it against GTK3 :)

@elextr

All the GTK2 calls that have been deprecated in GTK3 have not yet been replaced in Geany, so the GTK3 compile isn't "clean".

…which doesn't matter much until GTK4 -- and even then, the GTK3 part should work fine. There are things that are simply too much hassle to "port" for virtually no gain, so until we drop support for GTK2 they are highly likely to stay.

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