mtre...@bcc190cf-cafb-0310-a4f2-bffc1f526a37  committed 99c27df

Fixed filter_horizontal and filter_vertical handling in admin so that they can
be lists (aren't required to be tuples). It's less error-prone to use one item
lists than one-tuples, but this caused a crash.

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  • Parent commits d8da503

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File django/contrib/admin/

                     if in self.raw_id_fields:
                         kwargs['widget'] = widgets.ManyToManyRawIdWidget(db_field.rel)
                         kwargs['help_text'] = ''
-                    elif in (self.filter_vertical + self.filter_horizontal):
+                    elif in (list(self.filter_vertical) + list(self.filter_horizontal)):
                         kwargs['widget'] = widgets.FilteredSelectMultiple(db_field.verbose_name, ( in self.filter_vertical))
             # Wrap the widget's render() method with a method that adds
             # extra HTML to the end of the rendered output.