Qt: nonnative Save/Open file dialogs are not rendered

[375gnu]

Describe the bug Since commit 7cf1aac save and open file dialogs don't work anymore: they don't render anything inside them.

To Reproduce Steps to reproduce the behavior:

1. Press F10

Expected behavior Dialog should render and allow file selection.

Screenshots

Desktop (please complete the following information):

• OS: GNU/Linux
• Frontend: Qt
• Version: 1.7.0

Additional context I use XFCE, so Qt uses dialogs provided by Gtk+. With Qt-own dialogs (QFileDialog::DontUseNativeDialog) this issue doesn't emerge.

[Askaniy]

No problems for me on KDE Plasma

[ajtribick]

Works for me on i3, does not work on XFCE