Dom0 GUI does not adhere to selected Xfce/Gtk theme

[SvenSemmler]

How to file a helpful issue

The problem you're addressing (if any)

Starting with R4.1 some of the Qubes OS GUI uses QT5. One effect of this is, that by default those GUI do not adhere to the theme selected in XFCE. This is particularly an issue for users of dark themes.

The solution you'd like

This is quite easy to fix by installing qt5-qtsyleplugins in dom0 and exporting QT_QPA_PLATFORMTHEME=gtk2

The value to a user, and who that user might be

The XFCE/Gtk2 theme selected by the user applies to the Qubes OS GUI as it does to the rest of dom0

[andrewdavidwong]

Which Qubes GUI components are affected? Currently (in 4.1.1), it seems to me that only the Qube Manager is not adopting the selected system theme. (I do not have the new app menu yet.)

Does your solution fix the Qube Manager?

Are you seeing other GUI tools that are affected?

[quantumpacket]

Are you seeing other GUI tools that are affected?

From the Qubes Tools menu:

Backup Qubes
Create Qubes VM
Qubes Global Settings
Qubes Template Manager
Restore Backup

[andrewdavidwong]

I see, thanks. Since this is technically a regression from 4.0, I think it might be more accurate to classify this as a bug.