Administration items are silently reset when set by non-admin users

Binary package hint: alacarte

To replicate this issue:

1. Log in as a user that is not in the admin group*
2. Run alacarte
3. Tick one of the unticked administrators-only options (e.g. "Login Window")
4. Wait 5 seconds
5. The box will untick itself

* Or edit /etc/group and remove yourself from the admin group - no need to log in/out this way

I assume that the inability to select these options is a feature rather than a bug, but the particular implementation (silently undoing your actions) is quite annoying. It would be better to:

* grey out the tick box for those options, so that it can't be ticked in the first place
* as a tooltip, and as a popup if the user tries to tick the grey box, explain that "only users in the 'admin' group can use this item"

 - Andrew Sayers