More clear scoping and interaction with running actions in
UmAccountDialog. In later 'enterprise login' patches we have long
running actions that's why this needs cleaning up.
In particular:
* Show errors as children of the dialog.
* Errors don't make the account dialog go away, user can correct
problems.
* Use more standard GAsyncResult style callbacks:
um_account_dialog_perform() um_account_dialog_finish()
* Disable controls while the operation is happening.
* Allow the user to cancel long actions in UmAccountDialog by
pressing the cancel button.
https://bugzilla.gnome.org/show_bug.cgi?id=677548
We were leaking various references, leading to failures to populate
the list upon reloading, or to segfaults. With this commit, all
created user objects, as well as the user-manager object are
finalized when the panel is unloaded.
When used with accountsservice >= 0.6.9, this fixes the problem where,
when you click the unlock button on the user panel, the root user pops
up in the user list, unexpectedly.
When used with 0.6.8 it silently does nothing, since the system-account
property is not available.
https://bugzilla.gnome.org/show_bug.cgi?id=647487
