assert(Lines[Cursor_line].mode == 'text')

    else
      local new_cursor_line = Cursor_line
      while new_cursor_line > 1 do
        new_cursor_line = new_cursor_line-1
        if Lines[new_cursor_line].mode == 'text' then
          Cursor_line = new_cursor_line
          Cursor_pos = #Lines[Cursor_line].data+1
          break
        end
      end

    assert(Lines[Cursor_line].mode == 'text')

    else
      local new_cursor_line = Cursor_line
      while new_cursor_line <= #Lines-1 do
        new_cursor_line = new_cursor_line+1
        if Lines[new_cursor_line].mode == 'text' then
          Cursor_line = new_cursor_line
          Cursor_pos = 1
          break
        end
      end