Notify the user when your application has finished starting up.
GNOME implements the Startup Notification protocol, to give feedback to the user when application startup finishes.
GTK+ applications automatically support startup notification, and by
default notify that application startup is complete when the first window is
shown. Your application must declare that it supports startup notification by
adding StartupNotify=true
to its desktop file.
More complicated startup scenarios, such as showing a splash screen during
startup, would need custom handling with gdk_notify_startup_complete()
.