Namely Kleopatra, but I stumpled upon some dialog that had this dark theme too, I dont know anymore what it was.
I couldn’t find any setting that does this. Does it have to do with GTK? That’s all I have:
[xxx@xbase ~/config]$ ls gtk-*
gtk-2.0:
total 12K
drwxr-xr-x 2 xxx xxx 4,0K 16. Jul 23:12 .
drwxr-xr-x 101 xxx xxx 4,0K 6. Okt 20:56 ..
-rw-r--r-- 1 xxx xxx 223 16. Jul 23:12 gtkfilechooser.ini
gtk-3.0:
total 12K
drwx------ 2 xxx xxx 4,0K 1. Okt 01:00 .
drwxr-xr-x 101 xxx xxx 4,0K 6. Okt 20:56 ..
-rw-r--r-- 1 xxx xxx 385 1. Okt 01:00 bookmarks
gtk-4.0:
total 8,0K
drwx------ 2 xxx xxx 4,0K 6. Okt 20:57 .
drwxr-xr-x 101 xxx xxx 4,0K 6. Okt 20:56 ..