Set prgname to application ID

[City-busz]

Using the application ID ensures that Wayland compositors could match the window with the application and show the appropriate icon for them.

References:

• https://honk.sigxcpu.org/con/GTK__and_the_application_id.html
• https://docs.gtk.org/gtk4/migrating-3to4.html#set-a-proper-application-id

[mtwebster]

Do we really need this? The desktop file is already org.x.Warpinator here because we publish a Flatpak version (unlike a lot of our other apps)

[City-busz]

Do we really need this? The desktop file is already org.x.Warpinator here because we publish a Flatpak version (unlike a lot of our other apps)

Yes, it's needed, otherwise Wayland compositors like KWin are unable to find the matching .desktop file to read the icon name. Without setting the prgname, the value is warpinator-launch.py, so GTK3 sets the Wayland toplevel ID to warpinator-launch.py. But the desktop file is called org.x.Warpinator.desktop, so KWin and other compositors are unable to find it, because there is no warpinator-launch.py.desktop installed.

[mtwebster]

So:

• Desktop filename - correct
• DBus service filename - correct
• GApplication ID set to match - correct

Still not enough!!!!!