Git commits in Moodle 3.8.3 by Mikhail Golenkov

commit a58cfea20579c1426231e265f715ae90ad925a36
Author: Mikhail Golenkov <mikhailgolenkov@catalyst-au.net>
Date:   Sun, 26 Apr 2020 08:55:17 +0800
Tag:    v3.8.3

MDL-67540 quiz: Start transaction before selecting existing slots.


commit 214542af796eaa1c62b7fb5ce13bb0b2e2de2a90
Author: Mikhail Golenkov <mikhailgolenkov@catalyst-au.net>
Date:   Thu, 02 Apr 2020 07:21:41 +0800
Tag:    v3.8.3

MDL-65700 javascript: Add url-polyfill.


commit 4a363544eb0b3f199224bbae4ec3beac1ca47396
Author: Mikhail Golenkov <mikhailgolenkov@catalyst-au.net>
Date:   Thu, 26 Mar 2020 14:12:33 +0800
Tag:    v3.8.3

MDL-68223 assign: Fix selection of comment text.