@tknopp I agree that Gtk.jl is a great piece of work and appreciate the effort that went into it. But Gtk itself really does leave a lot to be desired and this have been a long standing complaint from Mac and Windows users. WxWindows and Qt on the other hand are well established and do look fine.
As I’m not volunteering to work on this I realise I have a small (or insignificant voise), but as a data point: Gtk really does not look fine to me and my users, to the extent that I am forced to use PyQt from Julia, which is clearly sub-optimal (I would like to try Qml.jl but can’t install it on Windows at the moment).
Here is a screenshot giving a small example of the poor quality of Gtk (notice the difference between the native title bar and the actual GUI):
Qt, Wx, libui do not have this problem, which is why it is a little frustrating that the best maintained and designed GUI library for Julia is something different.