copy method
Implementation
TableEntity copy() {
return TableEntity(
columnCount: columnCount,
rowCount: rowCount,
addable: addable,
removable: removable,
captionLayout: captionLayout?.copy(),
columns: columns.map((e) => e.copy()).toList(),
rows: rows.map((e) => e.copy()).toList(),
footerLayout: footerLayout?.copy(),
);
}