Opening a chat notification should default to a popped-out window for that chat.

Currently, clicking a Windows system notification for teams only ever opens the main window, changing the view from whatever files tab I was in back up and out to chats/teams/channels.

This seems to run against the point of allowing separate chat windows.

Another fix: allow popping-out all chats as one tabbed window, and/or combining popped-out chat windows.