Bumping this because it came up again with two Reno-s. Is it really that hard to say “is there someone in the room with the same first name? OK, show the last name, too.” There’s already the list of those in the room in the UI.
I see there was some detailed discussion of this earlier, but frankly I think it overcomplicates the issue. Yes, it might not work so well in scrollback etc. but when it is most needed the client usually has the state to do it. Best effort that works 95% of the time is far better than a full solution that never happens!