[Policykit] No possibilty to unlock the save option in Gedit while trying to modify xorg.conf

[thibaut bethune]

Policykit is there to avoid the user to get a dialog box that would
say "that can't be done" without offering a workaround (if i'm not
mistaken)

well i've run Nautilus, and i've opened in Gedit etc/X11/xorg.conf
i've made some changes in it and pressed the "save" button (which was
active) and i've gotten an error message

I think that :
either the save button should not be active (at less)
either the user should have the possibilty to give the password to be
able to save the file (that would be perfect to me)