Tweak admin widget - FilteredSelectMultiple

In the Admin where user group membership is shown and groups can be
selected from choices derived from auth_groups, I want to control the
available choices.

It seems the place to do so might be in admin/widgets.py in the
AutocompleteMixin.optgroups() method a few lines in where it says ...

        choices = (
            (obj.pk, self.choices.field.label_from_instance(obj))
            for obj in
self.choices.queryset.using(self.db).filter(pk__in=selected_choices)
        )

Could a very kind person explain to me how I can hijack this and remove
a couple of groups from the resulting choices?

My use case is that I want members of the 'admin' group to be able to
assign any group membershipto any other userexcept for a couple of
groups which are too permissive. The excepted groups can only be
assigned by a Superuser.

Many thanks for any hints

Cheers

Mike


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