rem: QWidget* KMFilterActionForward::createParamWidget(KMGFilterDlg* aParent)
add: QWidget* KMFilterActionIdentity::createParamWidget(KMGFilterDlg* aParent)
context: QWidget* KMFilterActionForward::createParamWidget(KMGFilterDlg* aParent){  QLineEdit* edt;  edt = aParent->createEdit(mTo);  return edt;}