The htmlspecialchars escaping of error messages in PMA_Error, introduced in https://github.com/phpmyadmin/phpmyadmin/commit/656809ac3bdc8ba61b84657b8789..., causes problems with error messages containing links. See this photo for reference: http://cl.ly/FQ0H, read main.php, lines 293 and 329.
Do we prefer using trigger_error() or the direct PMA_Message::display variant?
-- mynetx