Unable to revoke superuser privilege (RM #631)

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Issue migrated from Redmine: https://redmine.postgresql.org/issues/631
Originally created by Evan Martin at 2013-07-10 11:17:14 UTC.

In pgAdmin 1.16.1 I open the Login Role Properties dialog and on the Role priveleges tab try to uncheck "Superuser". A dialog box pops up:

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Confirm superuser deletion

Deleting a superuser might result in unwanted behaviour (e.g. when restoring the database).
Are you sure?

Yes No

Whether I click Yes or No, the checkbox becomes checked again, so I have no way to remove the superuser privilege (using the GUI).