Reduce repetitive notification sound.

when a conversation is ongoing on a server, no matter if you read the messages or you have already been pinged 15 times. it will keep pinging you for each. new. message. 

instead if i have read the newest message in that server, it should only make a sound if a new message appears after 5+ minutes of silence or if you have been tagged. i've understood the first 5 messages, so for as long as that conversation is ongoing there is literally zero reason to keep notifying me.