Git commits in Moodle 3.5.0 by dinhloc

commit f4695ec722b80e86abca08aceba8f30f9167aab2
Author: dinhloc <ndloc1905@gmail.com>
Date:   Tue, 09 Jan 2018 10:38:54 +0800
Tag:    v3.5.0-beta

MDL-61033 quiz: Editing a quiz while a preview is open