code: def scroll_one_line_down(event):
      
      w = find_window_for_buffer_name(event.cli, event.cli.current_buffer_name)
      b = event.cli.current_buffer
  
      if w:
          # When the cursor is at the top, move to the next line. (Otherwise, only scroll.)
          if w.render_info:
              info = w.render_info
  
              if w.vertical_scroll < info.content_height - info.window_height:
                  if info.cursor_position.y <= info.configured_scroll_offsets.top:
                      b.cursor_position += b.document.get_cursor_down_position()
  
                  w.vertical_scroll += 1
docs: scroll_offset += 1