runAssertions method
Implementation
void runAssertions(int rowsLength, int columnsLength) {
assert(contentCellWidth != null || columnWidths != null);
assert(contentCellHeight != null || rowHeights != null);
if (columnWidths != null) {
assert(columnWidths!.length == columnsLength);
}
if (rowHeights != null) {
assert(rowHeights!.length == rowsLength);
}
}