Program: 79305
Project: 79305
Buggy source:
private void populateLists(){
  this.bEnableEvents=false;
  cmbDataType.add("String_Node_Str");
  cmbDataType.add("String_Node_Str");
  if (formatspecifier instanceof DateFormatSpecifier || formatspecifier instanceof JavaDateFormatSpecifier) {
    cmbDataType.select(0);
    if (formatspecifier instanceof DateFormatSpecifier) {
      btnStandard.setSelection(true);
    }
 else     if (formatspecifier instanceof JavaDateFormatSpecifier) {
      btnAdvanced.setSelection(true);
    }
 else {
      btnUndefined.setSelection(true);
    }
    slStandardDetails.topControl=this.cmpStandardDateDetails;
    slAdvancedDetails.topControl=this.cmpAdvancedDateDetails;
  }
 else {
    cmbDataType.select(1);
    if (formatspecifier instanceof NumberFormatSpecifier) {
      btnStandard.setSelection(true);
    }
 else     if (formatspecifier instanceof JavaNumberFormatSpecifier) {
      btnAdvanced.setSelection(true);
    }
 else {
      btnUndefined.setSelection(true);
    }
    slStandardDetails.topControl=this.cmpStandardNumberDetails;
    slAdvancedDetails.topControl=this.cmpAdvancedNumberDetails;
  }
  updateUIState();
  Object[] oArrDT=DateFormatType.VALUES.toArray();
  for (int iDT=0; iDT < oArrDT.length; iDT++) {
    cmbDateType.add(((DateFormatType)oArrDT[iDT]).getName());
    if (formatspecifier instanceof DateFormatSpecifier && ((DateFormatSpecifier)formatspecifier).getType().equals((DateFormatType)oArrDT[iDT])) {
      cmbDateType.select(iDT);
    }
  }
  Object[] oArrDD=DateFormatDetail.VALUES.toArray();
  for (int iDD=0; iDD < oArrDD.length; iDD++) {
    cmbDateForm.add(((DateFormatDetail)oArrDD[iDD]).getName());
    if (formatspecifier instanceof DateFormatSpecifier && ((DateFormatSpecifier)formatspecifier).getDetail().equals((DateFormatDetail)oArrDD[iDD])) {
      cmbDateForm.select(iDD);
    }
  }
  String str="String_Node_Str";
  if (formatspecifier instanceof JavaDateFormatSpecifier) {
    str=((JavaDateFormatSpecifier)formatspecifier).getPattern();
    if (str == null) {
      str="String_Node_Str";
    }
    txtDatePattern.setText(str);
  }
  if (formatspecifier instanceof NumberFormatSpecifier) {
    str=((NumberFormatSpecifier)formatspecifier).getPrefix();
    if (str == null) {
      str="String_Node_Str";
    }
    txtPrefix.setText(str);
    str=((NumberFormatSpecifier)formatspecifier).getSuffix();
    if (str == null) {
      str="String_Node_Str";
    }
    txtSuffix.setText(str);
    str=String.valueOf(((NumberFormatSpecifier)formatspecifier).getMultiplier());
    if (str == null || !((NumberFormatSpecifier)formatspecifier).eIsSet(AttributePackage.eINSTANCE.getNumberFormatSpecifier_Multiplier())) {
      str="String_Node_Str";
    }
    txtMultiplier.setText(str);
    iscFractionDigits.setValue(((NumberFormatSpecifier)formatspecifier).getFractionDigits());
  }
  if (formatspecifier instanceof JavaNumberFormatSpecifier) {
    str=String.valueOf(((JavaNumberFormatSpecifier)formatspecifier).getMultiplier());
    if (str == null) {
      str="String_Node_Str";
    }
    txtAdvMultiplier.setText(str);
    str=((JavaNumberFormatSpecifier)formatspecifier).getPattern();
    if (str == null) {
      str="String_Node_Str";
    }
    txtNumberPattern.setText(str);
  }
  this.layout();
  this.bEnableEvents=true;
}

Fixed version (ground truth):
private void populateLists(){
  this.bEnableEvents=false;
  cmbDataType.add("String_Node_Str");
  cmbDataType.add("String_Node_Str");
  if (formatspecifier instanceof DateFormatSpecifier || formatspecifier instanceof JavaDateFormatSpecifier) {
    cmbDataType.select(0);
    if (formatspecifier instanceof DateFormatSpecifier) {
      btnStandard.setSelection(true);
    }
 else     if (formatspecifier instanceof JavaDateFormatSpecifier) {
      btnAdvanced.setSelection(true);
    }
 else {
      btnUndefined.setSelection(true);
    }
    slStandardDetails.topControl=this.cmpStandardDateDetails;
    slAdvancedDetails.topControl=this.cmpAdvancedDateDetails;
  }
 else {
    cmbDataType.select(1);
    if (formatspecifier instanceof NumberFormatSpecifier) {
      btnStandard.setSelection(true);
    }
 else     if (formatspecifier instanceof JavaNumberFormatSpecifier) {
      btnAdvanced.setSelection(true);
    }
 else {
      btnUndefined.setSelection(true);
    }
    slStandardDetails.topControl=this.cmpStandardNumberDetails;
    slAdvancedDetails.topControl=this.cmpAdvancedNumberDetails;
  }
  updateUIState();
  Object[] oArrDT=DateFormatType.VALUES.toArray();
  for (int iDT=0; iDT < oArrDT.length; iDT++) {
    cmbDateType.add(((DateFormatType)oArrDT[iDT]).getName());
    if (formatspecifier instanceof DateFormatSpecifier && ((DateFormatSpecifier)formatspecifier).getType().equals(oArrDT[iDT])) {
      cmbDateType.select(iDT);
    }
  }
  Object[] oArrDD=DateFormatDetail.VALUES.toArray();
  for (int iDD=0; iDD < oArrDD.length; iDD++) {
    cmbDateForm.add(((DateFormatDetail)oArrDD[iDD]).getName());
    if (formatspecifier instanceof DateFormatSpecifier && ((DateFormatSpecifier)formatspecifier).getDetail().equals(oArrDD[iDD])) {
      cmbDateForm.select(iDD);
    }
  }
  String str="String_Node_Str";
  if (formatspecifier instanceof JavaDateFormatSpecifier) {
    str=((JavaDateFormatSpecifier)formatspecifier).getPattern();
    if (str == null) {
      str="String_Node_Str";
    }
    txtDatePattern.setText(str);
  }
  if (formatspecifier instanceof NumberFormatSpecifier) {
    str=((NumberFormatSpecifier)formatspecifier).getPrefix();
    if (str == null) {
      str="String_Node_Str";
    }
    txtPrefix.setText(str);
    str=((NumberFormatSpecifier)formatspecifier).getSuffix();
    if (str == null) {
      str="String_Node_Str";
    }
    txtSuffix.setText(str);
    str=String.valueOf(((NumberFormatSpecifier)formatspecifier).getMultiplier());
    if (str == null || !((NumberFormatSpecifier)formatspecifier).eIsSet(AttributePackage.eINSTANCE.getNumberFormatSpecifier_Multiplier())) {
      str="String_Node_Str";
    }
    txtMultiplier.setText(str);
    iscFractionDigits.setValue(((NumberFormatSpecifier)formatspecifier).getFractionDigits());
  }
  if (formatspecifier instanceof JavaNumberFormatSpecifier) {
    str=String.valueOf(((JavaNumberFormatSpecifier)formatspecifier).getMultiplier());
    if (str == null) {
      str="String_Node_Str";
    }
    txtAdvMultiplier.setText(str);
    str=((JavaNumberFormatSpecifier)formatspecifier).getPattern();
    if (str == null) {
      str="String_Node_Str";
    }
    txtNumberPattern.setText(str);
  }
  this.layout();
  this.bEnableEvents=true;
}