I have a problem with chat messages shaking, I guess

[anton-manchenko]

I made custom message type for attributed text. Message type based on Your text message. Difference is only in field with text (for your message it's text, for my type - attributed text). I got interesting bug. When i add new messages - sometimes chat don't whant to scroll them. I found out that chat do some kind of shacking of messages. Did anybody got same problems? ThanX