ChatView not scrolling to the bottom when entering new messages or initial loading of view.

[ravrunner]

Probably not a big thing in the scheme of the demo, but:

• when entering a new chat message the ChatView ListView doesn't scroll to the bottom to show the entered message or subsequent response. This makes it look like the demo app is unresponsive/broken, even though the message/response has been appended to the bottom of the list.
• also when the keyboard pops up it doesn't move the bottom of the chat above the keyboard and edit field.
• same applies to when first loading the ChatView, if you have a long chat thread then you don't see the bottom as would be typical in chat view.