                     if marks.length == 0
                         @mark_output_line(cm, line)
                     mark = cm.findMarksAt({line:line, ch:1})[0]
-                    window.x = x
                     f = (elt, mesg) =>
                         try
                             @process_output_mesg

                            console.log(e.stack)
                            log("BUG: error rendering output: '#{mesg}' -- #{e}")

                    if mark? and not mark.finish_editing? and mark.processed != x
                        # This is more complicated than you might think because past messages can
                        # be modified at any time -- it's not a linear stream.
                        output = @elt_at_mark(mark)
                        # appearance of output shows output
                        output.removeClass('sagews-output-hide')
                        messages = x.split(MARKERS.output).slice(2) # skip output uuid

                        @close_on_action(elt)

    elt_at_mark: (mark) =>
        elt = mark?.replacedWith
        if elt?
            return $(elt)

