I'm not sure about the older versions, but on my Ubuntu 12.04 they don't do the same: Shutdown shows the dialog with a 60-seconds countdown and RequestShutdown doesn't show any dialog.
GNOME Session Shutdown calls the first method because I liked the idea to have one last chance to cancel the shutdown… maybe I could add an option to let the user choose.
I'm not sure about the older versions, but on my Ubuntu 12.04 they don't do the same: Shutdown shows the dialog with a 60-seconds countdown and RequestShutdown doesn't show any dialog.
GNOME Session Shutdown calls the first method because I liked the idea to have one last chance to cancel the shutdown… maybe I could add an option to let the user choose.