Minor There is an incorrect use of a moodle_url object in weblib line 2272:
$action = new popup_action('click', $link->url, 'ratingscales', array('height' => 400, 'width' => 500));
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Should be
$action = new popup_action('click', $link, 'ratingscales', array('height' => 400, 'width' => 500));
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I'll commit a fix for this shortly.