reopen_object (PDF::Writer)

          # File lib/pdf/writer.rb, line 1815
    1815:   def reopen_object(id)
    1816:     @stack << { :contents => @current_contents, :page => @current_page }
    1817:     @current_contents = id
    1818:       # if this object is the primary contents for a page, then set the
    1819:       # current page to its parent
    1820:     @current_page = @current_contents.on_page unless @current_contents.on_page.nil?
    1821:     @current_contents
    1822:   end