MOBILE-3430 messages: Discard messages already sent in sync
MOBILE-3430 messages: Discard messages already sent in sync

moodlehq/moodlemobile2,moodlehq/moodlemobile2,reskit/moodlemobile,moodlehq/moodlemobile2,reskit/moodlemobile,reskit/moodlemobile,reskit/moodlemobile,moodlehq/moodlemobile2,moodlehq/moodlemobile2,reskit/moodlemobile,moodlehq/moodlemobile2,reskit/moodlemobile