Git commits in Moodle 3.7.3 by Nathan Nguyen

commit 9cab0bb4658e8c2ae3cf8f01ce7c1b5953a412b1
Author: Nathan Nguyen <nathannguyen@catalyst-au.net>
Date:   Thu, 12 Sep 2019 10:10:13 +0800
Tag:    v3.7.3

MDL-46978 core_grades: preserve category total visibility


commit d540a0ae0b605d69eeeb7a9c9e8908ea4821b35d
Author: Nathan Nguyen <nathannguyen@catalyst-au.net>
Date:   Thu, 12 Sep 2019 08:26:24 +0800
Tag:    v3.7.3

MDL-64917 filepicker: change event dispatch