- expanded = discussion_left.try(:expanded?) || discussion_right.try(:expanded?)
%tr.notes_holder{ class: ('hide' unless expanded) }
  - if discussion_left
    %td.notes_line.old
    %td.notes_content.parallel.old
      .content{ class: ('hide' unless discussion_left.expanded?) }
        = render "discussions/notes", discussion: discussion_left, line_type: 'old'
  - else
    %td.notes_line.old= ("")
    %td.notes_content.parallel.old
      .content

  - if discussion_right
    %td.notes_line.new
    %td.notes_content.parallel.new
      .content{ class: ('hide' unless discussion_right.expanded?) }
        = render "discussions/notes", discussion: discussion_right, line_type: 'new'
  - else
    %td.notes_line.new= ("")
    %td.notes_content.parallel.new
      .content