Unused since 67235fd4.

This is a security fix.

This is a security fix.

Thanks Florian Apolloner and Shai Berger for review.

Refs #22792

This partially reverts commit bc7d201b.

Thanks Tim for the review.

Refs #25858.

Test was added in 4c934f39 to verify that
the commend works when locale.getdefaultlocale() doesn't return a locale.
getdefaultlocale() no longer runs at runtime, so the test isn't needed.

It was added in 20bab2cf and stopped being
used for `Range` in 00aa5628 when
`bilateral` was added to `Transform`.

As suggested by Tim Graham

Security & data loss fixes are applied to the two last feature releases,
not just one.

Thanks Loic Bistuer for review

Thanks Simon Charette for the review.

This should prevent managers methods from returning content type instances
registered to foreign apps now that these managers are also attached to models
created during migration phases.

Thanks Tim for the review.

Refs #23822.

Made SessionTestsMixin backend agnostic and removed code obsoleted by the test
discovery refactor.

Thanks Markus Holtermann for review.

Thanks Simon Charette for help.