def find_patch_position_by_line_number(line_number)
      target = changed_lines.find { |line| line.number == line_number }
      return nil unless target
      target.patch_position
    end
def find_patch_position_by_line_number(line_number)
      target = changed_lines.find { |line| line.number == line_number }
      return nil unless target
      target.patch_position
    end
@param line_number [Integer] line number

 @return [Integer, nil] patch position