shutdown dialog can't use right click but other menus can

[Lokard]

In the unity greeter (Lightdm) every button on the screen can now be clicked with either the left or right click of a mouse (hence compatible with right-handed and left-handed mouses alike). However this is not the case in the dialog that appears when clicking the "Shutdown..." button on the upper-right corner; in that case only a left-click can be used, and the right-click (i.e. the main click in a left-handed mouse) is useless, only selecting buttons.

The dialogs in the greeter should use left and right clicks indifferently, like the rest of the greeter.

[Adam Dingle (adam-yorba)]

Actually there's one more button which still cannot be clicked with a right click (i.e. via a left-handed mouse): the button which chooses a session (e.g. Ubuntu or GNOME).