--?   love.graphics.setColor(0.75,0.75,0.75)
--?   love.graphics.line(line_width, 0, line_width, Screen_height)

      if line.screen_line_starting_pos == nil then
        line.screen_line_starting_pos = {1, pos}
      else
        table.insert(line.screen_line_starting_pos, pos)
      end

  return x >= 16 and y >= line.y and y < line.y + math.floor(15*Zoom)

  if x < 16 then return false end
  if y < line.y then return false end
  if line.screen_line_starting_pos == nil then return y < line.y + math.floor(15*Zoom) end
  return y < line.y + #line.screen_line_starting_pos * math.floor(15*Zoom)

function Text.move_cursor(line_index, line, mx)

function Text.move_cursor(line_index, line, mx, my)

  Cursor_pos = Text.nearest_cursor_pos(line.data, mx)

  if line.screen_line_starting_pos == nil then
--?     print('single screen line')
    Cursor_pos = Text.nearest_cursor_pos(line.data, mx)
    return
  end
  assert(line.fragments)
  assert(my >= line.y)
--?   print('move_cursor', mx, my)
  if my < line.y + math.floor(15*Zoom) then
--?     print('first screen line')
    Cursor_pos = Text.nearest_cursor_pos(line.data, mx)
    return
  end
  -- duplicate some logic from Text.draw
  local y = line.y
  for _,screen_line_starting_pos in ipairs(line.screen_line_starting_pos) do
--?     print('screen line:', screen_line_starting_pos)
    local nexty = y + math.floor(15*Zoom)
    if my < nexty then
      local s = string.sub(line.data, screen_line_starting_pos)
      Cursor_pos = screen_line_starting_pos + Text.nearest_cursor_pos(s, mx) - 1
      return
    end
    y = nexty
  end
  assert(false)

-- manual test:
--  line: abc
--        def
--        gh
--  fragments: abc, def, gh
--  click inside e
--  line_starting_pos = 1 + 3 = 4
--  nearest_cursor_pos('defgh', mx) = 2
--  Cursor_pos = 4 + 2 - 1 = 5
-- manual test:
--  click inside h
--  line_starting_pos = 1 + 3 + 3 = 7
--  nearest_cursor_pos('gh', mx) = 2
--  Cursor_pos = 7 + 2 - 1 = 8

--    screen_line_starting_pos: optional array of grapheme indices if it wraps over more than one screen line

--?         y = Text.draw(line, 100, line_index, Cursor_line, Cursor_pos)

        Text.move_cursor(line_index, line, x)

        Text.move_cursor(line_index, line, x, y)