[bug] adding buddy to list sometimes gets cached for relaunch of client

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I had a buddy of mine add me to his friends list. I added him but then he was still able to send me another invite. The subsequent invites didn't appear. Some time later, my client crashed and when I restarted, his invite to buddy list popped up again and when I accepted it, added him to my list a second time, with that second one acting as if offline.