void set_auto_startup_notification(bool notify
By default, after showing the first GtkWindow for
each GdkScreen, GTK+ calls notify_startup_complete. Pass
false to this function to disable the automatic startup
notification. You might do this if your first window is a splash screen,
and you want to delay notification until after your real main window has
been shown, for example.
In that example, you would disable startup notification temporarily, show
your splash screen, then re-enable it so that showing the main window
would automatically result in notification.
This method must be called statically.