About preventing Listview.Builder() to rebulding it all items - flutter

Question

I am getting users data from firebase by stream builder,
And I am rendering those data using Listview.builder(),
one problem is that when I get snapshot from firestore my all items in listview.builder() is rebuilding.
how do I prevent this thing reRendering or Rebuilding()
Hear is my Code
class GetUser extends StatelessWidget {
#override
Widget build(BuildContext context) {
print("// <1> Use StreamBuilder");
return StreamBuilder<QuerySnapshot>(
// <2> Pass `Stream<QuerySnapshot>` to stream
stream: FirebaseFirestore.instance
.collection('users')
.orderBy('createdAt', descending: false)
.snapshots(),
builder: (context, snapshot) {
if (snapshot.hasData) {
// <3> Retrieve `List<DocumentSnapshot>` from snapshot
final List<DocumentSnapshot> documents = snapshot.data.docs;
//documents.forEach((doc) => print(doc));
print(documents.length);
return SingleChildScrollView(
scrollDirection: Axis.vertical,
child: Column(
children: [
SizedBox(
height: MediaQuery.of(context).size.height,
child: ListView.builder(
addAutomaticKeepAlives: true,
addRepaintBoundaries: false,
itemCount: documents.length,
itemBuilder: (context, i) {
return Items(
doc: documents[i],
);
},
),
)
],
),
);
} else if (snapshot.hasError) {
return Text("Error");
} else {
return Text("Waiting");
}
});
}
}
//this Item class is invoked every time I add a user to the collection
class Item extends StatefulWidget {
final DocumentSnapshot doc;
const Item({Key key, this.doc}) : super(key: key);
#override
_ItemState createState() => _ItemState();
}
class _ItemState extends State<Item> {
#override
Widget build(BuildContext context) {
print("Build called ${widget.doc.id}");
return Text("${widget.doc["full_name"]}--${widget.doc.id}");
}
}