Dmitry Gutov <dgutov@yandex.ru> writes:

> Seems so. (string-match-p "GTK3" system-configuration-features) should
> tell more reliably, though.

(string-match-p "GTK3" system-configuration-features)
=> 225

> Perhaps you icon theme doesn't provide scaled versions of the icons
> (mine includes .svg files for scaling) and GTK decided that it
> shouldn't scale the icons because of that.
>
> Just guessing, though. I tried a bunch of icons themes already
> installed on my machine and couldn't repro, but they probably all do
> provide scaled versions of the respective icons.
>
> And my GTK version is 3.24.20. Same Cairo version.

My toolbar looks totally different from all the other screenshots,
though.  I mean: