Git commits in Moodle 3.8.x by Raphaël Santos

commit 21d6123fbd0305b01951461e6664a53634df7c84
Author: Raphaël Santos <raphael.santos@liip.ch>
Date:   Wed, 21 Aug 2019 15:48:28 +0800
Tag:    v3.8.0-beta

MDL-66409 mod_lesson: Fix editing of numerical pages