Developer credits
Git commits in Moodle 3.8.4 by Nick Phillips
commit f8621e3d587082b25f795d10c1e1c68c00eaaf68 Author: Nick Phillips <nick.phillips@otago.ac.nz> Date: Wed, 04 Mar 2020 11:16:41 +0800 Tag: v3.8.4 MDL-68103 theme_classic: hidden-print => d-print-none for BS4.