/// <summary>
 /// Oblicz i dodaj nowe EmptyFields
 /// </summary>
 /// <param name="insertedRectangle">Currently inserted rectangle</param>
 private void AddNewEmptyFields(Rectangle insertedRectangle)
 {
     Point newMaxPossibleRD = ComputeNewMaxPossibleRectangleRightDown(insertedRectangle);
     if (!newMaxPossibleRD.Equals(maxPossibleRect.RightDown))
     {
         Rectangle newMaxPossibleRect = new Rectangle(maxPossibleRect.LeftTop, newMaxPossibleRD);
         List<Rectangle> newEmpties = newMaxPossibleRect.Subtract(maxPossibleRect);
         IEnumerator<Rectangle> nEmpEnum = newEmpties.GetEnumerator();
         while (nEmpEnum.MoveNext())
         {
             Rectangle temp = nEmpEnum.Current;
             List<Rectangle> tempEmpties = temp.Subtract(insertedRectangle);
             if (tempEmpties.Count > 0)
                 // poprawione - Pawe�
                 //emptyFields.AddRange(tempEmpties);
                 addToList(emptyFields, tempEmpties);
         }
     }
 }