updateDisplayItems method
Updates display items (used for server-side pagination)
Implementation
void updateDisplayItems(List<T> items, {bool append = false}) {
final newSelectItems = items.map(_convertToSelectItem).toList();
if (append) {
_displayItems.addAll(newSelectItems);
} else {
_displayItems = newSelectItems;
}
_preserveSelectionStates();
displayItemsNotifier.value = List.from(_displayItems);
notifyListeners();
}