Disabling the mail part of an online account through the Control Center
panel will now remove the CamelService from the EMailSession in addition
to disabling the account/identity/transport ESources, causing it to be
delisted from the account list in Preferences.
Furthermore, hide the Enabled check box for accounts linked to GOA in
Preferences. The collection ESource for these accounts can no longer
be disabled through Evolution; all such account manipulation must be
done through the Control Center panel.
Lastly, display an icon next to accounts linked to GOA in Preferences.
* Might be nice to show the actual provider icon instead of the generic
Online Accounts icon from the Control Center, but need to think about
how best to do that. Don't want a GOA dependency in core Evolution.
Maybe ESourceCollection should grow a GIcon property for the online-
accounts module in the registry service to set?
d88c38abeb