So I’ve been using Soundconverter for ages now. Even in KDE Plasma, theming wasn’t an issue… until recently. I haven’t used it for a couple of weeks. Just opened it and it looks horrible.
Odd thing is, when I click ‘preferences’, the Soundconverter preferences box IS themed. And ideas?
Has it recently moved to gtk4? What theme is set in settings?
Looks like the interface “now follows gnome”…
Hmmm. Still odd that the preferences dialog box is still themed.
It’s a child window, so likely follows a different style, couldn’t test as I am logged into Hyprland ATM.
I found a workaround. I opened ‘Edit Applications’ and added GTK_THEME=Breeze to the ‘Environment Variables’ box for Sound Converter…
So GTK4 and libadwaita.
Do other GTK4 applications look fine?
I might also wonder about something like elevated privileges.. things that require it like gparted might not follow theming without extra steps. This is less likely I guess if its something that has suddenly changed.
“Sudden change” together with “broke userspace” is certainly par for a gnome update, so its entirely possible this is something like intended behavior. 
But we might also ask if this is a SNAP/Flatpak or the regular repo package or the AUR git one and if foreign when it was last built.
By the way .. again partially due to GNOME being funny .. these kinds of settings arent necessarilly picked up where/how you would expect, and this is exacerbated under wayland.
See here for example:
https://wiki.archlinux.org/title/GTK#Wayland_backend
And here:
And so I have in my /etc/environment on this plasma system;
# GTK Theme - helpful for wayland
GTK_THEME=Breeze-Dark
I believe Mousepad is GTK? It’s the default text editor for XFCE. Looks fine in my KDE Plasma EOS.
I installed soundconverter from Arch Extra Repo.
GTK - yes.
GTK4/libadwaita - no.
baobab, cheese, evince, geary .. no need to list them all but yeah the new/GNOME stuff would be adwaita/4.
I have kinda tried to keep it off my system in general. Only gtk3 here (no gtk2 either). 
By the way .. if you must use GTK4/libadwaita but find it horrendous there is libadwaita-without-adwaita in the AUR. Dont know about its state/quality.
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