clone method
Clone method of BordersCollecton.
Implementation
BordersCollection clone() {
final BordersCollection bordersCollection = BordersCollection(workbook);
bordersCollection.all = (all as CellBorder).clone();
bordersCollection.left = (left as CellBorder).clone();
bordersCollection.right = (right as CellBorder).clone();
bordersCollection.top = (top as CellBorder).clone();
bordersCollection.bottom = (bottom as CellBorder).clone();
return bordersCollection;
}