# File lib/sup/modes/edit-message-mode.rb, line 119
  def edit_message_or_field
    lines = DECORATION_LINES + @selectors.size
    if lines > curpos
      return
    elsif (curpos - lines) >= @header_lines.length
      edit_message
    else
      edit_field @header_lines[curpos - lines]
    end
  end