removeAll method
Removes each element of elements
from this ValueNotifier's value.
final charactersValueNotifier = <String>{'A', 'B', 'C'}.notifier;
characters.removeAll({'A', 'B', 'X'});
print(characters); // {C}
Implementation
@override
void removeAll(Iterable<Object?> elements) =>
_updateOnAction(() => value.removeAll(elements));