Pimcore\Model\Document\PrintAbstract::pdfIsDirty PHP Method

    public function pdfIsDirty()
    {
        return $this->getLastGenerated() < $this->getModificationDate();
    }

 public function pdfIsDirty()
 {
     $dirty = parent::pdfIsDirty();
     if (!$dirty) {
         $dirty = $this->getLastGenerated() < $this->getLastedChildModificationDate();
     }
     return $dirty;
 }