As long as the input parameters are the same, the selector will return the cached value so that we don't construct the list twice, which involves blocklist filtering.
* Add Channel Mention selection ability
* Fix mentioned user name being smaller than other text
* Improve logic for locating a mention
* Fix mentioning with enter on livestream
* Fix breaking for invalid URI query
* Handle punctuation after mention
* Fix name display and appeareance
* Use canonical url
* Fix missing search
