Program: 11733
Project: 11733
Buggy source:
public List<String> getQualifiedInterfaceExtendsList(){
  List<String> result=new UniqueEList<String>();
  String rootExtendsInterface=getGenModel().getRootExtendsInterface();
  if (rootExtendsInterface == null) {
    rootExtendsInterface="String_Node_Str";
  }
  if (getBaseGenClasses().isEmpty()) {
    if (!isEObject() && !isBlank(rootExtendsInterface)) {
      result.add(rootExtendsInterface);
    }
    return result;
  }
  boolean needsRootExtendsInterface=true;
  for (  GenClass genClass : getAllBaseGenClasses()) {
    if (genClass.getEcoreClass().getInstanceClassName() == null && rootExtendsInterface.equals(genClass.getGenModel().getRootExtendsInterface())) {
      needsRootExtendsInterface=false;
      break;
    }
  }
  if (needsRootExtendsInterface && !isBlank(rootExtendsInterface)) {
    result.add(rootExtendsInterface);
  }
  boolean includeTypeArguments=getEffectiveComplianceLevel().getValue() >= GenJDKLevel.JDK50;
  for (int i=0, size=getBaseGenClasses().size(); i < size; i++) {
    GenClassImpl genClass=(GenClassImpl)getBaseGenClasses().get(i);
    EGenericType eGenericType=getEcoreClass().getEGenericSuperTypes().get(i);
    if (genClass.isExternalInterface() || genClass.isInterface() || !genClass.getGenModel().isSuppressInterfaces()) {
      if (includeTypeArguments && !eGenericType.getETypeArguments().isEmpty()) {
        result.add(genClass.getInternalQualifiedInterfaceName() + getTypeArguments(this,eGenericType.getETypeArguments(),false));
      }
 else {
        result.add(genClass.getInternalQualifiedInterfaceName());
      }
    }
  }
  return result;
}

Fixed version (ground truth):
public List<String> getQualifiedInterfaceExtendsList(){
  List<String> result=new UniqueEList<String>();
  if (!isExternalInterface()) {
    String rootExtendsInterface=getGenModel().getRootExtendsInterface();
    if (rootExtendsInterface == null) {
      rootExtendsInterface="String_Node_Str";
    }
    if (getBaseGenClasses().isEmpty()) {
      if (!isEObject() && !isBlank(rootExtendsInterface)) {
        result.add(rootExtendsInterface);
      }
      return result;
    }
    boolean needsRootExtendsInterface=true;
    for (    GenClass genClass : getAllBaseGenClasses()) {
      if (genClass.getEcoreClass().getInstanceClassName() == null && rootExtendsInterface.equals(genClass.getGenModel().getRootExtendsInterface())) {
        needsRootExtendsInterface=false;
        break;
      }
    }
    if (needsRootExtendsInterface && !isBlank(rootExtendsInterface)) {
      result.add(rootExtendsInterface);
    }
  }
  boolean includeTypeArguments=getEffectiveComplianceLevel().getValue() >= GenJDKLevel.JDK50;
  for (int i=0, size=getBaseGenClasses().size(); i < size; i++) {
    GenClassImpl genClass=(GenClassImpl)getBaseGenClasses().get(i);
    EGenericType eGenericType=getEcoreClass().getEGenericSuperTypes().get(i);
    if (genClass.isExternalInterface() || genClass.isInterface() || !genClass.getGenModel().isSuppressInterfaces()) {
      if (includeTypeArguments && !eGenericType.getETypeArguments().isEmpty()) {
        result.add(genClass.getInternalQualifiedInterfaceName() + getTypeArguments(this,eGenericType.getETypeArguments(),false));
      }
 else {
        result.add(genClass.getInternalQualifiedInterfaceName());
      }
    }
  }
  return result;
}