django.git, branch 3.1a1

[3.1.x] Bumped version for 3.1 alpha 1 release.

2020-05-14T09:05:05Z

[3.1.x] Fixed #31575 -- Added system check for admin sidebar request context processor dependency.

2020-05-14T09:01:22Z

Co-authored-by: Carlton Gibson Backport of d522b51c401429c169d88742178a9b3777903d9e from master

[3.1.x] Refs #31034 -- Documented admin requires django.template.context_processors.request.

2020-05-14T09:01:17Z

Required since d24ba1be7a53a113d19e2860c03aff9922efec24. Co-authored-by: Carlton Gibson Backport of e341bed606d8ab2864838795276692cf86b08687 from master

[3.1.x] Fixed #31568 -- Fixed alias reference when aggregating over multiple subqueries.

2020-05-14T08:26:05Z

691def10a0197d83d2d108bd9043b0916d0f09b4 made all Subquery() instances equal to each other which broke aggregation subquery pushdown which relied on object equality to determine which alias it should select. Subquery.__eq__() will be fixed in an another commit but Query.rewrite_cols() should haved used object identity from the start. Refs #30727, #30188. Thanks Makina Corpus for the report. Backport of adfbf653dc1c1d0e0dacc4ed46602d22ba28b004 from master

[3.1.x] Fixed #31566 -- Fixed aliases crash when chaining values()/values_list() after annotate() with aggregations and subqueries.

2020-05-14T06:39:21Z

Subquery annotation references must be resolved if they are excluded from the GROUP BY clause by a following .values() call. Regression in fb3f034f1c63160c0ff13c609acd01c18be12f80. Thanks Makina Corpus for the report. Backport of 42c08ee46539ef44f8658ebb1cbefb408e0d03fe from master

[3.1.x] Added stub release notes for 2.2.13.

2020-05-14T04:30:02Z

Backport of 50798d43898c7d46926a4292f86fdf3859a433da from master

[3.1.x] Fixed #31576 -- Fixed selenium tests with headless mode.

2020-05-13T13:46:56Z

Horizontal scrollbar doesn't appear with the headless mode on small windows, that's why window.scrollTo() is not an option for these tests. Tests changed after adding a navigation sidebar in 46fe506445666d8097945f0c1e8be11cfd644b28. Backport of 18eb852874a073001cb509f64002b6d82bdc760b from master

[3.1.x] Used :envvar: role and .. envvar:: directive in various docs.

2020-05-13T07:38:59Z

Backport of fbdb032de266ba5f82e061ab204f6c622889d563 from master

[3.1.x] Used :mimetype: role in various docs.

2020-05-13T07:38:49Z

Backport of feb91dbda13974f84eac52dccdc0de1ddb636616 from master

[3.1.x] Used :pep: role in various docs.

2020-05-13T07:38:40Z

Backport of a9337b4add01e50ed8ff8d3ef44099a08cba475c from master