Hi! It looks like you know quite a bit about themes already!
Re.
But can I also install themes for qt apps separately?, my guess is that you can install them but I feel you can have just one theme active at a time.
So, ideally, if you want to run gtk2, gtk3,
and qt apps in the same session, your best bet would be to find a theme that caters to all the apps you intend running. I feel you won't be able to run, in the same session, a gtk2 app with one theme and a gtk3 app with another theme and a qt app with a third theme.
(There's a
distro that allows you to change DEs without logging out but that's OT.)
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