some kind of low level inheritance hack

from: https://stackoverflow.com/a/65880079

update for collections -> collections.abc move

[1.9.x] Bumped version 1.9.5 release.

[1.9.x] Added release date for 1.9.5 and 1.8.12.

Backport of 93539ba2f42fe56bacefd09a9e8f93b31565f746 from master

[1.9.x] Refs #25532 -- Removed a failing test on Django 1.9

That test is failing on Django 1.9, that issue has been fixed on master
only as it touches a part of form validation that is too important to
touch for a stable release.

[1.9.x] Fixed #25532 -- Properly redisplayed JSONField form input values

Thanks David Szotten for the report and Tommy Beadle for code inspiration.
Thanks Tim Graham for the review.
Partial backport of db19619545 from master.

[1.9.x] Fixed #26438 -- Fixed multiple .objects typos in the docs.

Thanks Pablo Oubiña for the report.

Backport of 64aba7a8aba06b8be52a1a099b44e1d3be4bdd26 from master

[1.9.x] Fixed #26436 -- Added a link to the settings filtering in the error reporting howto.

Thanks mlissner for the suggestion.

Backport of 8928823b135b9ce2c7b18f4da0d2602b113a247e from master

[1.9.x] Removed some docs that should have been removed along with PROFANITIES_LIST.

Backport of 12dee89d9c1fbe6b47984c544505aa8ff77e92bc from master

[1.9.x] Refs #26384, #24995 -- Skipped a schema test on older MySQL versions.

Backport of f3595b25496691966d4ff858a3b395735ad85a6e from master

[1.9.x] Fixed #26410 -- Added a docs example for loader.render_to_string().

Backport of a65fc6df891ab449e9c24160f6f6a1d6d2ccb282 from master

[1.9.x] Fixed #26384 -- Fixed renaming the PK on a model with a self-referential FK on SQLite.

Backport of 4b2cf1cd27587a30b3b081091627d7ee13141afe from master

[1.9.x] Fixed #26413 -- Fixed a regression with abstract model inheritance and explicit parent links.

Thanks Trac alias trkjgrdg for the report and Tim for investigation and review.

Backport of 67cf5efa31acb2916034afb15610b700695dfcb0 from master

[1.9.x] Fixed #26416 -- Fixed references to previous tutorial numbers in docs/intro/reusable-apps.txt.

Backport of 0c0e8f0a62eb369bb05ff770ad53656831c8c01a from master

[1.9.x] Sorted single letter imports per the latest version of isort.

Backport of 1c8c0837c61a9e9eb2129df29f75be92e47e926c from master

[1.9.x] Fixed typo in docs/ref/contrib/postgres/aggregates.txt.

Backport of 82243e5150f67b6fe8c6f8f650bf3b492823c3e7 from master

[1.9.x] Fixed #26408 -- Updated link to DEP 182.

Thanks kaifeldhoff for the report.

Backport of 7b1ce7f from master

[1.9.x] Fixed #26387 -- Restored the functionality of the admin's raw_id_fields in list_editable.

Backport of acfaec3db5ba39de52f6e607e74343dccf72fba1 from master

[1.9.x] Fixed typo in docs/topics/db/aggregation.txt.

Backport of 8550566af6321fe111ac1fe6497720e6ac291824 from master

[1.9.x] Fixed #26293 -- Fixed CommonMiddleware to process PREPEND_WWW and APPEND_SLASH independently.

Backport of 9390da7fb6e251eaa9a785692f987296cb14523f from master