applyRedactions method
Implementation
Future<int> applyRedactions(int pageIndex, List<Rect> areas) async {
attach();
final UPdfEdit? edit = _edit;
if (edit == null) return 0;
final int removed = await UPdfRedactor(edit).apply(pageIndex, areas);
viewer.invalidatePage(pageIndex);
notifyListeners();
return removed;
}