The fullname is displayed instead of the username if not empty

app/Templates/notification_comment_creation.php

@@ -1,6 +1,6 @@
 <h2><?= Helper\escape($task['title']) ?> (#<?= $task['id'] ?>)</h2>
 
-<h3><?= t('New comment posted by %s', $comment['username']) ?></h3>
+<h3><?= t('New comment posted by %s', $comment['name'] ?: $comment['username']) ?></h3>
 
 <?= Helper\parse($comment['comment']) ?>