deleteAnnotation method
Implementation
Future<bool> deleteAnnotation(int pageIndex, int objectNumber) async {
attach();
final UPdfEdit? edit = _edit;
if (edit == null) return false;
final bool done = await edit.removeAnnotation(pageIndex, objectNumber);
if (done) {
_undoStack.remove(objectNumber);
viewer.invalidatePage(pageIndex);
notifyListeners();
}
return done;
}