Show New Messages on the bottom right corner of the chat area if Chat History is being browsed.

[larryw3i]

Hey, friends, 

I got an issue about `Chat` Tab: The scrollbar skips to end automatically when the new message is coming, but I'm browsing the messages history. It should show the `New Messages` tip on the bottom right corner of the chat area if the chat history is being browsed. Hope it been fixed soon.  

Regards,

larryw3i

[Jon]

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