Git commits in Moodle 3.7.x by Kiet.Chan

commit 7473f63a3deb7a168f16c119f3211b906b765acd
Author: Kiet.Chan <kietlyc2@gmail.com>
Date:   Wed, 11 Dec 2019 14:56:13 +0800
Tag:    v3.7.4

MDL-67417 theme_boost: Tooltip icon stop working after closing using ESC