Git commits in Moodle 3.9.2 by Tim Schroeder

commit f131e22bc47b7932991411bf2ca1dc4bc00a785f
Author: Tim Schroeder <t.schroeder@itc.rwth-aachen.de>
Date:   Thu, 16 Jul 2020 23:22:30 +0800
Tag:    v3.9.2

MDL-60574 atto_undo: fixed redo erasing content


commit ff92024ec2def338366a06abf8c6124b9b532819
Author: Tim Schroeder <t.schroeder@itc.rwth-aachen.de>
Date:   Tue, 05 May 2020 03:00:07 +0800
Tag:    v3.9.2

MDL-68605 mod_assign: return grp submissns from ws