def shift_output_offsets(delta)
      return if delta == 0
      @data.each do |m|
        break if m.output.start_pos.line > 1
        m.output.start_pos.offset += delta
        m.output.end_pos.offset += delta if m.output.end_pos.line > 1
      end
    end
def shift_output_offsets(delta)
      return if delta == 0
      @data.each do |m|
        break if m.output.start_pos.line > 1
        m.output.start_pos.offset += delta
        m.output.end_pos.offset += delta if m.output.end_pos.line > 1
      end
    end
Shifts any output source ranges that lie on the first line forward one or
 more characters on that line.

 @param delta [Integer] The number of characters to shift the ranges
   forward.