roundcubemail/program/lib/Roundcube/rcube_message.php
private function check_context($part)
    {
        return $this->context === null || strpos($part->mime_id, $this->context . '.') === 0;
    }
private function check_context($part)
    {
        return $this->context === null || strpos($part->mime_id, $this->context . '.') === 0;
    }
private function check_context ( $ part ) { return $ this -> context === null || strpos ( $ part -> mime_id , $ this -> context . '.' ) === 0 ; }
Check if specified part belongs to the current context
Check if specified part belongs to the current context