Git commits in Moodle 3.5.2 by Jake Hau

commit dfe3389cf5c9166bcbd7622b9a0827fbec7636f9
Author: Jake Hau <phuchau1509@gmail.com>
Date:   Tue, 19 Jun 2018 18:13:30 +0800
Tag:    v3.5.2

MDL-29701 editor: mform disableif doesn't work on editor element