Affected Version: 2.1.5
What steps will reproduce the problem?
1. grant a normal user "Owner" +1 "Administer Add Settings" right
2. have the owner mistakenly click the wrong "access right" check box and remove their Owner right.
3. the owner is now required to bother another admin to regain their admin rights.
What is the expected output? What do you see instead?
I would hope that any time someone is about to give away rights which cannot be regained an "are you sure?" warning would be shown. Most access control modifications are fine. I think the only right worth warning about is the "owner" category. When a user (esp an admin) gives away their ability to modify rights, this can make for a long recovery period.