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Copy of ``django.contrib.admin.utils.get_deleted_objects`` and a subclass of
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querysets.
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generic way, into Django itself.
This code has been copied from Django 1.9.4.
At all locations where something has been changed, there are inline comments
in the code.
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Find all objects related to ``objs`` that should also be deleted. ``objs``
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template with the ``unordered_list`` filter.
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