Git commits in Moodle 4.0.x by Johannes Burk

commit cb5943094da240e0dac413014d0361ca2ea83147
Author: Johannes Burk <burk@htw-berlin.de>
Date:   Wed, 29 Jun 2022 16:38:36 +0800
Tag:    v4.0.3

MDL-75083 login: prevent double submission