enableWhere method
Enables items matching predicate.
Implementation
void enableWhere(bool Function(M3EDropdownItem<T>) predicate) {
for (var i = 0; i < _items.length; i++) {
if (predicate(_items[i]) && _items[i].disabled) {
_items[i] = _items[i].copyWith(disabled: false);
}
}
_reapplySearchFilter();
notifyListeners();
}