anchor.diff:          context,
           someChecked,
           allChecked,
  -        dataRows,
  +        coreRows,
  +        fixedRows,
  +        fixedCornerRows,
  +        fixedColumnsRows,
           rows,
           defaultDataRowHeight,
           effectiveDataRowColor);
  
positive.code:         theme,
          tableColumnWidths.length - fixedLeftColumns,
          defaultRowColor,
          fixedTopRows);
  
      List<TableRow>? fixedTopRowsRows = fixedTopRows > 0
          ? (fixedTopRows == 1
              ? [
                  _buildHeadingRow(context, theme, effectiveHeadingRowColor,
  
negative.code:     this.fixedLeftColumns = 0,
      this.lmRatio = 1.2,
      required super.rows,
    })  : assert(fixedLeftColumns >= 0),
          assert(fixedTopRows >= 0) {
      if (scrollController != null) {
        _coreVerticalController = scrollController!;
      } else {
  