filterMentions
fun Flow<<Error class: unknown class>>.filterMentions(username: <Error class: unknown class>): <Error class: unknown class>
Uses isWithMention passing username as argument to take only messages with username mentions or text mentions
fun Flow<<Error class: unknown class>>.filterMentions(user: <Error class: unknown class>): <Error class: unknown class>
Uses isWithMention passing user as argument to take only messages with user mentions or text mentions