V14: Add additional validation around manipulating groups #15834
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Adds additional validation around manipulating user groups, more specifically it ensures that the admin group is never left empty, since this would mean that no user could ever be added to the admin group again.
Most of this is pretty run-of-the-mill, however, there was a little snafu with the
UpdateUserGroupsUserController
, since this more or less acts more like a UserGroup controller, I've left a clarifying comment in the top of the file.Testing
Ensure that you are not allowed to remove all users from the admin group.