Problem:

In GDM 2.28/master on startup the user is presented with a window containing:
- A list of users to log in as with the first user selected
- Two buttons, restart and shutdown, below the user list

Since the first user is selected, users who are unfamiliar/not paying close attention sometimes click on the shutdown button as this is placed where the default action (in this case login) is conventionally placed (the lower right hand corner of the window).  The penalty of making this mistake is for the computer to shut down immediately with no chance of aborting this mistake.

An additional mistake users can make is to miss clicking on their user and then click on the shutdown button (as this button is replaced with the login button after selecting a user).

Recommended behaviour:

Move the shutdown actions (shutdown, sleep, hibernate, restart) to a menu on the GDM panel.

The shutdown buttons do not need to be prominently located as:
- They are used less frequently than the login buttons (normal operation is to shutdown from within your session).
- Most hardware has a dedicated power button that performs the same action
- It is better to have them in a location where they are less likely to be accidentally activated