Thanks Claude Paroz and Tim Graham for reviews, and
Mjumbe Wawatu Poe for the initial regression test.

Thanks to Mariusz Felisiak and Tim Graham for review.

Thanks Tim Graham for the review.

Thanks Jarek Glowacki for the report.

DateTimeField inherits these lookups from DateField.

Thanks Federico Capoano for finishing the patch.

Fixed #27436 -- Fixed makemigrations crash when creating migrations on a separate drive than where Django is installed.

If the test user creation fails here, _create_test_db() would return without
switching to the test user which caused the tests to run using the main
connection instead of the test user.

Reverted test changes in a7a7ecd2 and
e43ea36b (refs #27025).

Thanks Yuriy Korobko for the initial patch and Tobias McNulty for review.

(Fixed #23604 in 2014 and was not added before.)

Thanks samuller for the report and initial patch.