Wanted to suggest a new notification event - "New Chat".
At the moment the only notification for chat is "Incoming Message",
which plays sound and/or displays pop-up for *every* message received.
This might not be desired in some cases. I would therefore suggest a
new event called for example "New Chat" which would play sound *only*
when a new chat window is created for a new chat session (or re-opened
after it was closed).