Git commits in Moodle 3.8.2 by Kiet.Chan

commit 01fd8ac5654726617e6cd559a43e6339e9989f8e
Author: Kiet.Chan <kietlyc2@gmail.com>
Date:   Fri, 27 Dec 2019 10:50:00 +0800
Tag:    v3.8.2

MDL-67583 themes: Popover placement should react to scroll event