copyWith method
Implementation
void copyWith(ItemType newItem, int index) {
if (_pagingState is PagingStateData<PageKeyType, ItemType>) {
final value = _pagingState as PagingStateData<PageKeyType, ItemType>;
var items = [...value.items];
items[index] = newItem;
emit(PagingStateData(items, value.status, value.hasRequestNextPage));
}
}