Upon (re)connecting all rooms are "read"

[jansol]

Currently only rooms that receive messages after connecting are marked as unread, making it easy to miss messages. This seems to apply to both quitting weechat and relaunching it and losing network connection for a while.

Expected behaviour: like vector, mark rooms as unread if they have received messages while client was offline. (and they haven't been marked read by other clients)

[erdnaxeli]

I am working on it. I already got the notification (hotlist) working correctly, but not the read bar.