MultiWidget does not respect Widget.needs_multipart_form
If a widget that is wrapped with a MultiWidget has needs_multipart_form set, the MultiWidget does not reflect that. This prevents automatically setting the form enctype correctly using the Form.is_multipart method.
The ClearableFileField from django-form-utils is an example of such a widget. It combines a FileField with a Checkbox, where the Checkbox allows clearing/removing an already selected file from the form. While this particular widget is now not needed as it is included in Django in an alternate implementation, this bug still exists.
In 75c87e2d38b181163a61ea99f2a17273274a3a2b: