Author: Ryan Wyllie
MDL-60063 feedback: add drag and drop of open close events
http://git.moodle.org/gw?p=moodle.git;a=commit;h=83d4635d99448e7f07c37885b33b4905a992ad34
http://github.com/moodle/moodle/commit/83d4635d99448e7f07c37885b33b4905a992ad34
+ 3.4 en [openafterclose,mod_feedback]