This file is indexed.

/usr/share/horde/nag/lib/Factory/TagBrowser.php is in php-horde-nag 4.2.7-1ubuntu1.

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<?php
class Nag_Factory_TagBrowser extends Horde_Core_Factory_Base
{
    protected $_instance;

    public function create()
    {
        if (empty($instance)) {
            $instance = new Nag_TagBrowser(
                $GLOBALS['injector']->getInstance('Nag_Tagger'));
        }

        return $instance;
    }

}