class Byebug::ListCommand

def display_list(b, e, lines, current)


otherwise we return the previous line @state.previous_line.
current line number. If we can show from B to E then we return B,
Show file lines in LINES from line B to line E where CURRENT is the
# 
def display_list(b, e, lines, current)
  width = e.to_s.size
  b.upto(e) do |n|
    if n > 0 && lines[n-1]
      if n == current
        print "=> %#{width}d: %s\n", n, lines[n-1].chomp
      else
        print "   %#{width}d: %s\n", n, lines[n-1].chomp
      end
    end
  end
  return e == lines.size ? @state.previous_line : b
end