wp-includes/PHPMailer/PHPMailer.php:4826Set the line break format string, e.g. "\r\n".
$lestring protected static function setLE($le) { static::$LE = $le; }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/PHPMailer/PHPMailer.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.