Git commits in Moodle 3.5.8 by Adrian Greeve

commit de168198e6cdf2b2e393c8d8e3a611e37b8626d1
Author: Adrian Greeve <abgreeve@gmail.com>
Date:   Fri, 23 Aug 2019 12:55:16 +0800
Tag:    v3.5.8

weekly release 3.5.7+