The join used by select_related was incorrectly INNER when the query
had an ORed filter for nullable join that was trimmed away. Fixed this
by forcing the join type to LOUTER even when a join was trimmed away
in ORed queries.

Thanks to @DrMeers for the report and @ludwigkraatz for the initial patch.

Remove incorrect CONTENT_TYPE header from GET and HEAD requests

Refs #20532

Thanks carbonXT for the report.

Fixed order of base classes in CBV mixin docs

Older versions of uWSGI and Sentry's middleware do not adhere to
the WSGI spec and cause the `request_finished` signal to never
fire. Added notes to the appropriate places in the docs.

Fixed #20537.

Also moved its documentation to the 'advanced' section. It doesn't
belong to the 'overview'. Same for TransactionTestCase.reset_sequences.

When available_apps is set, after a TransactionTestCase, the database
is now totally empty. post_syncdb is fired at the beginning of the next
TransactionTestCase.

Refs #20483.

Simplified a formset example in the docs

Fixed #20591: added version in docs for utils.module_loading.import_by_path

This reverts commit 64041f0e.

lookup.tests.LookupTests.test_regex_non_string fails under Postgres.
We should also try to rewrite the test using an existing model.

To be able to build translated documentation, docs/locale should
be a symbolic link to the django-docs-translations/translations
directory.

Thanks josh.23.french@.

Fixed #20585: normalize signature of DeletionMixin.post.

There was an inconsistency between how the label_tag for forms were
generated depending on which method was used: as_p, as_ul and as_table
contained code to append the label_suffix where as label_tag called on a
form field directly did NOT append the label_suffix. The code for
appending the label_suffix has been moved in to the label_tag code of
the field and the HTML generation code for as_p, as_ul and as_table now
calls this code as well.

This is a backwards incompatible change because users who have added the
label_suffix manually in their templates may now get double label_suffix
characters in their forms.

Made URL patterns consistent in docs/ref/contrib/flatpages.txt

The recent improvements should make shared_models obsolete.

This reverts commit 1059da8d, reversing
changes made to 4fa7f3cd.

This reverts commit 22b7870e.

Refs #20483.

Fixed #20483.

This can be used to make Django's test suite significantly faster by
reducing the number of models for which content types and permissions
must be created and tables must be flushed in each non-transactional
test.

It's documented for Django contributors and committers but it's branded
as a private API to preserve our freedom to change it in the future.

Most of the credit goes to Anssi. He got the idea and did the research.

Fixed #20483.

This allows using flush on a subset of the tables without having to
manually cascade to all tables with foreign keys to the tables being
truncated, when they're known to be empty.

On databases where truncate is implemented with DELETE FROM, this
doesn't make a difference. The cascade is allowed, not mandatory.

Refs #19875.

Thanks littlepig for the suggestion.

Fixed #20575 -- Typo in docs/topics/forms/media.txt