joomla/joomla-cms — pull request #4151 by Joey3000 (2014-08-22 22:49:27+00:00)
Title: Prevent sending of "remember-me" cookie deletion request when cookie not set

Also: added the HTTPS and HttpOnly cookie flags, as "Cookies must be deleted with the same parameters as they were set with" according to https://php.net/manual/en/function.setcookie.php. And that is how the cookie is set - see lines 739 - 740.