reset method
Resets the TableCellHelper with new rows and columns, which should be used
when TableRow count or TableCell content was changed, following setState
.
Implementation
void reset(int rows, int columns) {
assert(_rows >= 0 && _columns >= 0);
_rows = rows;
_columns = columns;
_keys = List.generate(_rows, (_) => List.generate(_columns, (_) => GlobalKey()));
_highests = <int>[];
}