class Reline::LineEditor

def resize
  return unless @resized
  @resized = false
  @rest_height = (Reline::IOGate.get_screen_size.first - 1) - Reline::IOGate.cursor_pos.y
  old_screen_size = @screen_size
  @screen_size = Reline::IOGate.get_screen_size
  @screen_height = @screen_size.first
  if old_screen_size.last < @screen_size.last # columns increase
    @rerender_all = true
    rerender
  else
    back = 0
    new_buffer = whole_lines
    prompt, prompt_width, prompt_list = check_multiline_prompt(new_buffer)
    new_buffer.each_with_index do |line, index|
      prompt_width = calculate_width(prompt_list[index], true) if @prompt_proc
      width = prompt_width + calculate_width(line)
      height = calculate_height_by_width(width)
      back += height
    end
    @highest_in_all = back
    @highest_in_this = calculate_height_by_width(prompt_width + @cursor_max)
    @first_line_started_from =
      if @line_index.zero?
        0
      else
        calculate_height_by_lines(@buffer_of_lines[0..(@line_index - 1)], prompt_list || prompt)
      end
    if @prompt_proc
      prompt = prompt_list[@line_index]
      prompt_width = calculate_width(prompt, true)
    end
    calculate_nearest_cursor
    @started_from = calculate_height_by_width(prompt_width + @cursor) - 1
    Reline::IOGate.move_cursor_column((prompt_width + @cursor) % @screen_size.last)
    @highest_in_this = calculate_height_by_width(prompt_width + @cursor_max)
    @rerender_all = true
  end
end