Author: Ryan Wyllie
MDL-64002 message: buffer send messages in UI for slow connections
http://git.moodle.org/gw?p=moodle.git;a=commit;h=485ebc9b67ae5b0cb48368ca1b0d218c82907fd9
http://github.com/moodle/moodle/commit/485ebc9b67ae5b0cb48368ca1b0d218c82907fd9
+ 3.8 en [retry,core]