No icon on Qubes OS (xfce4 desktop, fedora 35 guest OS)

[arkenoi]

Describe the bug

When I start Maestral from a command line, there is empty white square

To Reproduce

Run "maestral gui" or maestral_qt from the terminal

Expected behaviour

A tray icon appears

System:

• Maestral version: 1.6.2
• Python version: 3.10
• OS: Qubes OS, Fedora 35 template-based guest system.
• Desktop environment: xfce4 on Qubes
• PyQt version (for Linux GUI): 5.15.6 (5.15.6-1.fc35

Additional context

I did read the https://github.com/samschott/maestral/issues/46 but it did not help me much.

▲ ~ ls .local/lib/python3.10/site-packages/maestral_qt/resources/             
__init__.py                           maestral_tray-info-light.svg
__pycache__                           maestral_tray-paused-dark.svg
faceholder.png                        maestral_tray-paused-light.svg
file                                  maestral_tray-syncing-dark.svg
maestral.desktop                      maestral_tray-syncing-light.svg
maestral.icns                         ui_dropbox_location_dialog.py
maestral.png                          ui_relink_dialog.py
maestral_tray-disconnected-dark.svg   ui_selective_sync_dialog.py
maestral_tray-disconnected-light.svg  ui_settings_window.py
maestral_tray-error-dark.svg          ui_setup_dialog.py
maestral_tray-error-light.svg         ui_sync_event_widget.py
maestral_tray-idle-dark.svg           ui_sync_issue_widget.py
maestral_tray-idle-light.svg          ui_sync_issues_window.py
maestral_tray-info-dark.svg           ui_unlink_dialog.py

 ▲ ~ python                                                                    
Python 3.10.4 (main, Mar 25 2022, 00:00:00) [GCC 11.2.1 20220127 (Red Hat 11.2.1-9)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from maestral_qt.resources import *
>>> 
>>> icon = system_tray_icon('idle')
>>> print(icon.name())

>>> print(QtGui.QIcon.hasThemeIcon(icon.name()))
True
>>> 
>>> print(icon.availableSizes())
[PyQt6.QtCore.QSize(512, 512)]
>>> print(QtGui.QIcon.themeSearchPaths())
['/home/user/.local/share/icons', '/usr/local/share/icons', '/usr/share/icons', '/var/lib/snapd/desktop/icons', '/home/user/.local/share/icons', ':/icons']
>>> 

Interestingly enough, maestral package location is not even in the icon search path!

[samschott]

I'll need to look into this. System trays in Linux desktop environments are a bit messy, many environments do their own thing in where they look for icons, which formats they accept, and if they have system trays at all. Lacklustre support from Qt does not improve things.

[arkenoi]

Any way I could help further?