fix for EXT-4288 Shrinking chat history window from top doesn't keep scroll thumb at bottom
fix for EXT-4288 Shrinking chat history window from top doesn't keep scroll thumb at bottom

gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm