rem: const QString &path ) const
add: const QString &path, KMail::Callback& ) const
context:     bool handleClick( KMail::Interface::BodyPart *part,                      const QString &path ) const    {      QString iCal = part->asText();      if ( path == "accept" )        return handleAccept( iCal );      else if ( path == "decline" )        return handleDecline( iCal );      return false;    }