- An opaque gradient overlay on the top message. This creates the illusion
that there are more messages under that the user can scroll to.
- Changed the formatting of the chat messages.
- Repaired the scrolling that happens on load and when chatHistory prop
list updates. If a full page arrives we want to keep the position, but
on load and a single new message we want to jump to the bottom of the
list.
- Emitting loadMoreHistory expects a expanded list of chatHistory.
