Polkit-gnome authentication should autoselect the only user avalible

[gw0]

Binary package hint: policykit-gnome

I would suggest that in case of only one authorized user for a specific task he should be automatically selected. And not that you need to first click on the "Select user..." to set it - what is annoying.

Reproduce:
- Probably not essential: edit /etc/PolicyKit/PolicyKit.conf so that it requests the password of another user (eg: <define_admin_auth user="root"/>)
- And than click on the Unlock button in any system configuration window.

For me it looks like a patch should be done in polkit-gnome-auth-dialog.c in create_user_combobox(PolkitGnomeAuthDialog *auth_dialog, char **admin_users) and replace lines:
00265 /* Initially select the "Select user..." ... */
00266 gtk_combo_box_set_active (GTK_COMBO_BOX (combo), 0);
With:
/* Initially select the "Select user..." if there is more than one user else select him ... */
if(n != 1)
    gtk_combo_box_set_active (GTK_COMBO_BOX (combo), 0);
else
    gtk_combo_box_set_active (GTK_COMBO_BOX (combo), 1);