wp-includes/PHPMailer/OAuth.php:101Get a new RefreshToken.
League\OAuth2\Client\Grant\RefreshToken protected function getGrant() { return new RefreshToken(); }Unchanged from 6.9.7 through 7.1.0.
Signature, return type and hooks compared across 3 parsed releases.
src/wp-includes/PHPMailer/OAuth.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.