Thanks CHI Cheng.

The word 'by' seemed to be missing from the first line of the compilemessages command.

Thanks peterbe for the suggestion.

(the previous commit included only the test)

Thanks Aymeric Augustin for the report and Tim Graham for the review.

Thanks Paul McMillan, Aymeric Augustin, and Erik Romijn for reviews.

Fixed #22380 -- Missing SECRET_KEY variable in sample settings file for ...

Thanks to linovia for the report.

Thanks simon29 for the report.

Thanks Carl Meyer for the suggestion and Alex Gaynor and Carl for reviews.

Thanks nliberg for the report.

This reverts commit c45607e9, reversing
changes made to 9769337c.

Refactor. Stop using memory for list copies.

Don't copy list for iteration.

Changed the BaseEmailBackend to allow usage as context manager to open
and close connections.

The order of admin's changelist filters in the querystring relied on
dict ordering.

Thanks Keryn Knight.