anchor.diff:          child: new Icon(
             Icons.arrow_downward,
             size: _kArrowIconSize,
  -          color: (Theme.of(context).brightness == Brightness.light) ? Colors.black87 : Colors.white70
  -        )
  -      )
  +          color: (Theme.of(context).brightness == Brightness.light) ? Colors.black87 : Colors.white70,
  +        ),
  +      ),
       );
     }
   
  
positive.code:     @required this.label,
      this.tooltip,
      this.numeric: false,
      this.onSort
    }) : assert(label != null);
  
    /// The column heading.
  
negative.code:         child: new Checkbox(
            activeColor: color,
            value: checked,
            onChanged: onCheckboxChanged,
          ),
        ),
      );
      if (onRowTap != null) {
        contents = new TableRowInkWell(
          onTap: onRowTap,
          child: contents,
        );
      }
      return new TableCell(
        verticalAlignment: TableCellVerticalAlignment.fill,
        child: contents,
      );
    }
  
  