Can't override dark or light theme setting under Ubuntu 23.04

[mapperfr]

What is the bug or the crash?

When set to "default", the UI theme adapts to the global system options. It would be great to have an option to override this behaviour - e.g. keeping QGIS on default light theme while the system is set to dark mode, or the other way around.

See the system options in the top right angle and the "Thème UI" option in the QGIS settings, on the following screenshots:

Steps to reproduce the issue

1. Set your system to dark mode
2. Open QGIS
3. Go to Preferences > Options > General
4. Check "default" in "theme UI"
5. Restart QGIS
6. Check if QGIS is in dark mode or light mode

Repeat the steps by changing step 1 and setting your system to light mode. QGIS theme UI follows the global UI theme with no way to override the behaviour.

Versions

Version de QGIS	3.30.1-'s-Hertogenbosch	Branche de code de QGIS	Release 3.30
Version de Qt	5.15.9
Version de Python	3.10.6
Version de GDAL/OGR	3.6.3
Version de Proj	9.2.0
Version de la base de données du registre EPSG	v10.082 (2023-02-06)
Version de GEOS	3.11.2-CAPI-1.17.2
Version de SQLite	3.36.0
Version de PDAL	2.5.3
Version du client PostgreSQL	unknown
Version de SpatiaLite	5.0.1
Version de QWT	6.1.5
Version de QScintilla2	2.11.6
Version de l'OS	KDE Flatpak runtime

Extensions Python actives GeoCoding | 2.18 qgiscloud | 3.8.4 qgis_resource_sharing | 1.0.0 track_profile_2_web | 1.3 pgRoutingLayer | 3.0.2 mmqgis | 2021.9.10 GamepadNavigation | 1.0.5 qgis-maptiler-plugin | 3.2 Qgis2threejs | 2.7.1 kart | 1.0.10 LAStools | 1.4 zoom_level | 0.1 profiletool | 4.2.5 cartogram3 | 3.1.5 Mergin | 2023.1 koordinates | 1.0.3 qgis2web | 3.16.0 processing | 2.12.99 otbprovider | 2.12.99 grassprovider | 2.12.99 MetaSearch | 0.3.6 db_manager | 0.1.20

Supported QGIS version

• [X] I'm running a supported QGIS version according to the roadmap.

New profile

• [X] I tried with a new QGIS profile

Additional context

No response

[nicogodet]

FYI: https://lists.osgeo.org/pipermail/qgis-developer/2023-April/065773.html

[DelazJ]

Hi @mapperfr Same as #33079?

[mapperfr]

FYI: https://lists.osgeo.org/pipermail/qgis-developer/2023-April/065773.html

Yes I've seen it this morning, thanks for the notice @nicogodet! Two things though:

• Drag and drop works with QGIS on my system (Ubuntu 23.04 under Wayland + Gnome 44), I just tried with some random GRB file + a GPKG, they both properly load;
• There are some glitches indeed with the GUI, but nothing critical until now.

[mapperfr]

Hi @mapperfr Same as #33079?

Haha indeed @DelazJ, I forgot about it even if I added a comment two years ago! Thanks for spotting the duplicate. I'll update the original ticket and close this one then.

[mapperfr]

Duplicate of https://github.com/qgis/QGIS/issues/33079