FEATURE: Hide welcome topic if it hasn't been edited (#18632)

lib/topic_query_params.rb

@@ -18,6 +18,19 @@ module TopicQueryParams
     options[:topic_ids] = param_to_integer_list(:topic_ids)
     options[:no_subcategories] = options[:no_subcategories] == 'true' if options[:no_subcategories].present?
 
+    if hide_welcome_topic?
+      options[:except_topic_ids] ||= []
+      options[:except_topic_ids] << SiteSetting.welcome_topic_id
+    end
+
     options
   end
+
+  private
+
+  def hide_welcome_topic?
+    return false if !SiteSetting.bootstrap_mode_enabled
+    return false if @guardian.is_admin?
+    Site.welcome_topic_exists_and_is_not_edited?
+  end
 end