code: function adjustColumnWidths(allColumns, expectedWidth) {
      var columnsWidth = column_1.columnsTotalWidth(allColumns);
      var totalFlexGrow = getTotalFlexGrow(allColumns);
      var colsByGroup = column_1.columnsByPin(allColumns);
      if (columnsWidth !== expectedWidth) {
          scaleColumns(colsByGroup, expectedWidth, totalFlexGrow);
      }
  }
docs: Adjusts the column widths.
  Inspired by: https://github.com/facebook/fixed-data-table/blob/master/src/FixedDataTableWidthHelper.js