Git commits in Moodle 3.7.0 by Eric Merrill

commit d64e545a36756fb338d76e16bf83d22b7c7b992b
Author: Eric Merrill <merrill@oakland.edu>
Date:   Wed, 23 Jan 2019 10:40:12 +0800
Tag:    v3.7.0-beta

MDL-64609 gradebook: Prevent infinite loop in regrading