It can take a lot of space to show the sender of every message. This saves space by displaying the same sender only once if the messages are sent by the same person.

Type: add

BUG: https://iron.lily-is.land/T12

View a room. Verify that consecutive messages sent by the same person are collapsed, i.e. displaying the avatar and sender name only once.

Also, when the latest message in the room is sent by the current user, send another message and verify that the sender is also collapsed.