Git commits in Moodle 3.6.4 by Jonathon Fowler

commit ed35b34461d8f53ddda24f050e56d12bcc226188
Author: Jonathon Fowler <fowlerj@usq.edu.au>
Date:   Tue, 30 Apr 2019 10:34:34 +0800
Tag:    v3.6.4

MDL-65445 qtype_ddwtos: reposition draggables when the drops move