Once MM-4152 is fixed, you have to type 😛, press Enter to first choose the emoji, then press Enter to actually send the message.
To improve the user experience, open emoji autocomplete only after typing two characters.
typing `😛` doesn't open emoji autocomplete
typing `:pe` opens emoji autocomplete
When this is done, please remove the check that prevents more than MAX_EMOTICON_SUGGESTIONS emoji from being displayed. It won't be necessary any more since the changes for this ticket will already limit the number of emoji being listed.