Does anyone know how to fix this?

QFactoryLoader::QFactoryLoader() checking directory path "/nix/store/cmawg45iqr9v9zcczmy6szd2y5bcsvyv-diffpdf-2.1.3/bin/styles" ...
QApplication: invalid style override 'kvantum' passed, ignoring it.
        Available styles: Windows, Fusion

It does find libqgtk3.so, but setting QT_QPA_PLATFORMTHEME=gtk3 doesn't work.
From reading through https://github.com/therecipe/qt/issues/306 it looks like it is broken in some versions of Qt, which means I can't do anything about it unless the app is built on a newer version of Qt?

Hi yall - redirected from #dev:nixos.org. I was going to ask if it would be possible to include these patches in nixpkgs, so that people can use the profiles (opting in via dconf), and get some real world testing in for these patches.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4296