local root = self,

  local gridWidth = 24,

  '#makeGrid':: d.func.new(
    |||
      `makeGrid` returns an array of `panels` organized in a grid with equal width
      and `panelHeight`. Row panels are used as "linebreaks", if a Row panel is collapsed,
      then all panels below it will be folded into the row.

      Optional `startY` can be provided to place generated grid above or below existing panels.
    |||,
    args=[