Currently pytest will keep the last 3 root temporary directories for each testing session, for all tests.

This proposal is to change this behavior to only keep the directories for failed tests, instead of for all tests. This would save significant disk space for test suites which manipulate large amounts of data in the temporary directories.

The behavior of keeping the last 3 root temporary directories would be kept unchanged.

From: #8036 (comment)

EDIT: after some discussion, the full proposal is defined in #8141 (comment).