Program: 32749
Project: 32749
Buggy source:
/** 
 * {@inheritDoc} 
 */
public void listChanged(ListEvent listChanges){
  sourceSize=source.size();
  updates.beginEvent();
  while (listChanges.next()) {
    int sortedIndex=listChanges.getIndex();
    int type=listChanges.getType();
    int value=Integer.MIN_VALUE;
    if (type != ListEvent.DELETE && sourceSize > 0) {
      value=evaluator.evaluate(source.get(sortedIndex));
    }
    if (sortedIndex < lowerThresholdIndex - 1) {
      if (type == ListEvent.INSERT) {
        lowerThresholdIndex++;
        upperThresholdIndex++;
      }
 else       if (type == ListEvent.DELETE) {
        lowerThresholdIndex--;
        upperThresholdIndex--;
      }
 else       if (type == ListEvent.UPDATE) {
      }
    }
 else     if (sortedIndex == lowerThresholdIndex - 1) {
      int transformedIndex=sortedIndex - Math.max(lowerThresholdIndex,0);
      if (type == ListEvent.INSERT) {
        if (value < lowerThreshold) {
          lowerThresholdIndex++;
          upperThresholdIndex++;
        }
 else {
          upperThresholdIndex++;
          updates.addInsert(transformedIndex);
        }
      }
 else       if (type == ListEvent.DELETE) {
        lowerThresholdIndex--;
        upperThresholdIndex--;
      }
 else       if (type == ListEvent.UPDATE) {
        if (value >= lowerThreshold) {
          lowerThresholdIndex--;
          updates.addInsert(0);
        }
      }
    }
 else     if (sortedIndex >= lowerThresholdIndex && sortedIndex <= upperThresholdIndex) {
      int transformedIndex=sortedIndex - Math.max(lowerThresholdIndex,0);
      if (type == ListEvent.INSERT) {
        upperThresholdIndex++;
        if (value < lowerThreshold) {
          lowerThresholdIndex++;
        }
 else         if (value > upperThreshold) {
          throw new IllegalStateException();
        }
 else {
          updates.addInsert(transformedIndex);
        }
      }
 else       if (type == ListEvent.DELETE) {
        upperThresholdIndex--;
        updates.addDelete(transformedIndex);
      }
 else       if (type == ListEvent.UPDATE) {
        if (value < lowerThreshold) {
          lowerThresholdIndex++;
          updates.addDelete(transformedIndex);
        }
 else         if (value > upperThreshold) {
          upperThresholdIndex--;
          updates.addDelete(transformedIndex);
        }
 else {
          updates.addUpdate(transformedIndex);
        }
      }
    }
 else     if (sortedIndex == upperThresholdIndex + 1) {
      int transformedIndex=sortedIndex - Math.max(lowerThresholdIndex,0);
      if (type == ListEvent.INSERT) {
        if (value <= upperThreshold) {
          upperThresholdIndex++;
          updates.addInsert(transformedIndex);
        }
      }
 else       if (type == ListEvent.DELETE) {
      }
 else       if (type == ListEvent.UPDATE) {
        if (value <= upperThreshold) {
          upperThresholdIndex++;
          updates.addInsert(transformedIndex);
        }
      }
    }
 else     if (sortedIndex > upperThresholdIndex + 1) {
    }
 else {
      throw new IllegalStateException();
    }
  }
  updates.commitEvent();
}

Fixed version (ground truth):
/** 
 * {@inheritDoc} 
 */
public void listChanged(ListEvent listChanges){
  sourceSize=source.size();
  updates.beginEvent();
  while (listChanges.next()) {
    int sortedIndex=listChanges.getIndex();
    int type=listChanges.getType();
    int value=Integer.MIN_VALUE;
    if (type != ListEvent.DELETE && sourceSize > 0) {
      value=evaluator.evaluate(source.get(sortedIndex));
    }
    if (sortedIndex < lowerThresholdIndex - 1) {
      if (type == ListEvent.INSERT) {
        lowerThresholdIndex++;
        upperThresholdIndex++;
      }
 else       if (type == ListEvent.DELETE) {
        lowerThresholdIndex--;
        upperThresholdIndex--;
      }
 else       if (type == ListEvent.UPDATE) {
      }
    }
 else     if (sortedIndex == lowerThresholdIndex - 1) {
      int transformedIndex=sortedIndex - Math.max(lowerThresholdIndex,0);
      if (type == ListEvent.INSERT) {
        if (value < lowerThreshold) {
          lowerThresholdIndex++;
          upperThresholdIndex++;
        }
 else         if (value > upperThreshold) {
        }
 else {
          upperThresholdIndex++;
          updates.addInsert(transformedIndex);
        }
      }
 else       if (type == ListEvent.DELETE) {
        lowerThresholdIndex--;
        upperThresholdIndex--;
      }
 else       if (type == ListEvent.UPDATE) {
        if (value >= lowerThreshold) {
          lowerThresholdIndex--;
          updates.addInsert(0);
        }
      }
    }
 else     if (sortedIndex >= lowerThresholdIndex && sortedIndex <= upperThresholdIndex) {
      int transformedIndex=sortedIndex - Math.max(lowerThresholdIndex,0);
      if (type == ListEvent.INSERT) {
        upperThresholdIndex++;
        if (value < lowerThreshold) {
          lowerThresholdIndex++;
        }
 else         if (value > upperThreshold) {
          throw new IllegalStateException();
        }
 else {
          updates.addInsert(transformedIndex);
        }
      }
 else       if (type == ListEvent.DELETE) {
        upperThresholdIndex--;
        updates.addDelete(transformedIndex);
      }
 else       if (type == ListEvent.UPDATE) {
        if (value < lowerThreshold) {
          lowerThresholdIndex++;
          updates.addDelete(transformedIndex);
        }
 else         if (value > upperThreshold) {
          upperThresholdIndex--;
          updates.addDelete(transformedIndex);
        }
 else {
          updates.addUpdate(transformedIndex);
        }
      }
    }
 else     if (sortedIndex == upperThresholdIndex + 1) {
      int transformedIndex=sortedIndex - Math.max(lowerThresholdIndex,0);
      if (type == ListEvent.INSERT) {
        if (value >= lowerThreshold && value <= upperThreshold) {
          upperThresholdIndex++;
          updates.addInsert(transformedIndex);
        }
 else         if (sortedIndex == lowerThresholdIndex) {
          lowerThresholdIndex++;
          upperThresholdIndex++;
        }
      }
 else       if (type == ListEvent.DELETE) {
      }
 else       if (type == ListEvent.UPDATE) {
        if (value <= upperThreshold) {
          upperThresholdIndex++;
          updates.addInsert(transformedIndex);
        }
      }
    }
 else     if (sortedIndex > upperThresholdIndex + 1) {
    }
 else {
      throw new IllegalStateException();
    }
  }
  updates.commitEvent();
}