The failure was caused by generating the same warning from two tests.
The second time the same warning was raised it was swallowed by the
"once" simplefilter of warnings.

Thanks Jérémie Blaser.

Thanks to guettli for the initial ticket and patch, with additional work
from mehmetakyuz and Kevin Brolly.

Thanks Claes Ström for the patch.

Thanks Tomasz Jaskowski for the patch.

Fix for test failure introduced by 980ae2ab.

Fixed #15961 -- Added get_search_results to ModelAdmin

This adds a get_search_results method that users can override to
provide custom search strategies.

Thanks to Daniele Procida for help with the docs.

https://groups.google.com/d/msg/django-developers/dyldP9kFADc/rHTlRBVEP8MJ

Thanks Shai Berger for the report.

This commit also adds tests for the redirect feature of most auth views.
It also cleans up the tests, most notably using @override_settings instead
of ad-hoc setUp/tearDown methods.

Thanks to caumons for the report.

Conflicts:
	docs/releases/1.6.txt

Fixed #20442: NoneType error when fetching a stale ContentType with get_for_id

Add needed Imports to the Documentation, Part II

Integrity problems when using get_or_create through M2M

Fixes #18896. Add tests verifying that you can get IntegrityErrors using get_or_create through relations like M2M, and it also adds a note into the documentation warning about it

Fixed #19070 -- Additional test for urlize and brackets

Fixed #11442 -- Postgresql backend casts all inet types to text

Add missing imports and models to the examples in internationalization and localization documentation

Fixed #20126 -- XViewMiddleware moved to django.contrib.admindocs.middleware

Fixed #20340 - document required return value for disable_constraint_checking

Fixed #11915: generic Accept-Language matches country-specific variants

Fixed #11160: Formset non_form_errors returns ErrorList() if is_valid is not called

Fixed #18990: Loaddata now complains if fixture doesn't exist

Moved admin validation code to classes and have those be class
attributes to the ModelAdmin classes.