Keep a 'read' status for messages

[nickmeinhold]

Is your feature request related to a problem? Please describe. I noticed Messenger doesn't show you the read/unread status of messages and how annoying that is. I think we could scroll to the first unread message, and also show a line between read and unread messages (Discord is a good example).

Describe the solution you'd like

• keep a 'read' bool for each message, for each user / keep a 'last read' DateTime for each user
  • can then show a line between the read and unread messages (like Discord)
• keep a list of ids in each message of the users that have read that message
  • can show avatars of who has read each message (like messenger)