FIX: Don't update the last poster when a whisper is made

app/models/topic_featured_users.rb

@@ -38,6 +38,7 @@ WITH cte as (
     JOIN posts p ON p.topic_id = t.id
     WHERE p.deleted_at IS NULL AND
           NOT p.hidden AND
+          p.post_type <> #{Post.types[:whisper]} AND
           p.user_id <> t.user_id AND
           p.user_id <> t.last_post_user_id
           #{filter}
@@ -81,6 +82,7 @@ SQL
   private
 
     def update_participant_count
-      topic.update_columns(participant_count: topic.posts.count('distinct user_id'))
+      count = topic.posts.where('NOT hidden AND post_type <> ?', Post.types[:whisper]).count('distinct user_id')
+      topic.update_columns(participant_count: count)
     end
 end