Smuxi

Steps to reproduce:
1. Connect your smuxi-server to facebook.
2. Disconnect your smuxi client.
3. Some friend in facebook tells you something, i.e.: "want to have a beer today?"
4. (Let's say you're travelling, so you don't have easy access to your smuxi client, so...) you connect to facebook.com/ and reply to your friend from there.
5. [Repeat steps 1-4 for N number of friends. The higher N is, the more annoying this bug is.]
6. (After some days, you're back from travelling, so...) you launch your smuxi client.

Current results:
There are N highlighted conversations.

Expected results:
There should be no highlighted conversations in the facebook server tree, because you have replied to all of them (if you reply to a conversation, smuxi should consider all the past messages as read.)