Dark theme for XFCE on Debian

[outsidecontext]

Try this:

Picard daily builds

Found the theming thing: The magic is done by having the QGnomePlatform plugin installed. On Debian based systems the package should be qgnomeplatform-qt5. Then launching Picard with QT_QPA_PLATFORMTHEME=gnome would use the color scheme set there. When running actually GNOME this would already be set automatically. Dark / light theme detection requires QGnomePlatform >= 0.9. That won’t work with the AppImage though, unless it would have the QGnomePlatform plugin bundled. Which I won’t do. The A…