}
        ),
      ps
    );
    local sanitizedPanels = sanitizePanels(panels, 0);

    local grouped = panelUtil.groupPanelsInRows(sanitizedPanels);

    local panelsBeforeRows = panelUtil.getPanelsBeforeNextRow(grouped);
    local rowPanels =
      std.filter(
        function(p) p.type == 'row',
        grouped
      );

    local CalculateXforPanel(index, panel) =