I regret to inform you that the way your chat functions seems to be broken, here are the reasons as to why :
*By automatic chat scroll, I mean when you scroll up to read chat and then it automatically bumps you to the bottom when someone types something*
Typically, when you have the ability to scroll through chat, the purpose of said action is to read up on previous chat you may have missed whilst in game or just to recap what was said. Now the issue here is, when you scroll up to read the chat, if anyone types anything, it bounces back down AND even if you try to scroll the bar and hold left click with the mouse (which is an annoyance in itself) It still automatically bounces back down.
Please can you either make it so chat no longer automatically scrolls down OR at least provide the option to turn the functionality off in the options.
I recommend :
Options > Battle.net > Turn off automatic chat scroll
Naturally, if you're already at the bottom of the chat then it should automatically scroll but NOT when you scroll up to recap / read something you may have missed.
Thank you Blizzard
P.S. The reason why it is a fundemental flaw is because the only reason you would scroll up chat, is to read it, yet with this "auto-bounce to the bottom of chat when someone types" completely defeats the purpose.