Allow application icon to be themed on Linux

[viggy96]

Is your feature request related to a problem? Please describe.
Jellyfin Media Player uses its own icon for the taskbar/dock on Linux instead of specifying a generic icon that can be themed.

Describe the solution you'd like
Use generic icons

Describe alternatives you've considered
I have tried editing the *.desktop file associated with Jellyfin Media Player, but it only changes the icon in the application list, but not the taskbar/dock.

Additional context
Papirus provides icons for Jellyfin. I haven't checked, but I would imagine that other icon themes have icons for it as well.

[iwalton3]

The icon is already set to com.github.iwalton3.jellyfin-media-player which is not an absolute file path. It has to be named like that for Flatpak. Is there something I can do to make it able to be themed?

[viggy96]

Hmmm, you're right. Instead I'll submit a request to the icon theme to have them put in another link for Jellyfin Media Player.

[viggy96]

It appears this is in progress on this issue: PapirusDevelopmentTeam/papirus-icon-theme#2007

[viggy96]

Actually I just realised that the window icon is set here:

#if defined(Q_OS_WIN) || defined(Q_OS_LINUX)
    // Setting window icon on OSX will break user ability to change it
    app.setWindowIcon(QIcon(":/images/icon.png"));
#endif

[viggy96]

Icon themes change the icon in the application list for the user, but once the application is opened, the taskbar/dock button shows this hardcoded icon no matter which icon theme the user has selected.