SearchableListMixin should manage form

[typonaut]

It seems to me that if you are going to have a SearchableListMixin, then that Mixin should also deal with any form input required for the search. ie there should be a form_class property.

[sdolemelipone]

contrib.SearchableListMixin hasn't received a lot of maintenance over the years... probably django-filter deals with this much better now. Are you using the mixin? Feel free to submit a pull request if that change would be useful, it sounds reasonable.