Merge branch 'beta' of git.startinblox.com:components/solid-xmpp-chat into beta

src/plugins/sib-mention-autocomplete.js

@@ -5,11 +5,13 @@ converse.plugins.add('sib-mention-autocomplete', {
   overrides: {
     ChatRoom: {
       /**
+       * Get all known nicknames from the occupants of the room.
        * Move the `all` mention at the bottom.
+       *
        * @returns {*}
        */
       getAllKnownNicknames() {
-        const nicknames = this.__super__.getAllKnownNicknames.apply(this, arguments);
+        const nicknames = [...new Set(this.occupants.map(o => o.get('nick')).filter(n => n))];
 
         if (nicknames.indexOf('all') >= 0) {
           return nicknames.filter(n => n !== 'all').concat(['all']);