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Fixed #27099 -- Documented list filter's has_output() method.
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@ -969,6 +969,9 @@ subclass::
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The ``FieldListFilter`` API is considered internal and might be
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changed.
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List filter's typically appear only if the filter has more than one choice.
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A filter's ``has_output()`` method controls whether or not it appears.
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It is possible to specify a custom template for rendering a list filter::
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class FilterWithCustomTemplate(admin.SimpleListFilter):
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