Git commits in Moodle 3.10.8 by Nathan Nguyen

commit e10cbb53f6e3c5648a1da07e29950c3df5f00231
Author: Nathan Nguyen <nathannguyen@catalyst-au.net>
Date:   Wed, 20 Oct 2021 18:25:33 +0800
Tag:    v3.10.8

MDL-72679 qtype_ddmarker: Fix incorrect positions in multiple viewportss