[ticket/13713] Fix priorities

PHPBB3-13713

phpBB/phpbb/mention/source/group.php

@@ -15,6 +15,20 @@ namespace phpbb\mention\source;
 
 class group extends base_group
 {
+	/**
+	 * {@inheritdoc}
+	 */
+	public function get_priority($row)
+	{
+		/*
+		 * Presence in array with all names for this type should not increase the priority
+		 * Otherwise names will not be properly sorted because we fetch them in batches
+		 * and the name from 'special' source can be absent from the array with all names
+		 * and therefore it will appear lower than needed
+		 */
+		return 0;
+	}
+
 	/**
 	 * {@inheritdoc}
 	 */