Xfce 4.16, Greybird-dark theme.
Some (not all) Qt applications, doesn’t get the system theme, like showed in the following screenshot:
The theme is not applyed in the menu bar, but another application, shows the issue in the save dialog window: flameshot:
Some other Qt apps, like xnviewmp, doesn’t get the system theme at all.
I tried to force the theme, by executing these applications using GTK_THEME=Greybird:dark $appname
but with no dice. And the same occurs also with others themes.
What can I try to do?