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Backwards-incompatible changes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Dropped support for Django 1.7–1.10.
- Removed support for factory kwargs ``extra``, ``max_num``, ``can_order``,
``can_delete``, ``ct_field``, ``formfield_callback``, ``fk_name``,
``widgets``, ``ct_fk_field`` being set on ``BaseFormSetMixin`` and its
subclasses. Use ``BaseFormSetMixin.factory_kwargs`` instead.
- Removed support for formset_kwarg ``save_as_new`` being set on
``BaseInlineFormSetMixin`` and its subclasses. Use
``BaseInlineFormSetMixin.formset_kwargs`` instead.
- Removed support for ``get_extra_form_kwargs``. This can be set in the
dictionary key ``form_kwargs`` in ``BaseFormSetMixin.formset_kwargs`` instead.