[Merge] lp:~boiko/messaging-app/rtm-fix_1373479 into lp:messaging-app/rtm-14.09

[Bill Filler]

Review: Needs Fixing

if you scroll up the thread view and then recv a new message, it does autoscroll to the new message but the new message is repeated twice. Scrolling it out of view and back then corrects it to only show once.
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https://code.launchpad.net/~boiko/messaging-app/rtm-fix_1373479/+merge/247178
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