<< In case the user uses the invitation to access the room there is only the email as username given.>> ==> My personal opinion= it will be preferable (for UI causes) to display in this case only the part of the email before the "@" otherwise it'll be very long (for example displaying "seba.wagner" NOT seba.wag...@gmail.com which is too long and there's no place to display it, only if we enlarge the left users section)
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