Duplicate messages when remove recieved messages is off
When removing received sms messages is set to off via
/mm-sms rm_r off purple-mm-sms duplicates messages that have already been received.
This seems to happen when purple-mm-sms polls ModemManager for messages (I believe this happens when it starts up). I'm guessing purple-mm-sms gets a full list of messages and doesn't check for duplicates of messages it already knows about.
I think this may be related to chatty#287, but it's not quite the same bug.