Developer credits
Git commits in Moodle 3.6.4 by Peter
commit 3a7b1b4d6e54d0dac45270a6877e0f65cf6e7bd7 Author: Peter <peter@moodle.com> Date: Fri, 12 Apr 2019 12:45:39 +0800 Tag: v3.6.4 MDL-65134 core_message: Rerender the message with the updated last msg