Fix removeAt

lib/src/list.dart

@@ -88,6 +88,11 @@ class ManagedRealmList<T extends Object?> extends collection.ListBase<T> with Re
   }
 
   @override
+  T removeAt(int index) {
+    final result = this[index];
+    realmCore.listRemoveElementAt(handle, index);
+    return result;
+  }
 
   /// Removes all objects from this list; the length of the list becomes zero.
   /// The objects are not deleted from the realm, but are no longer referenced from this list.

lib/src/native/realm_core.dart

@@ -824,6 +824,12 @@ class _RealmCore {
     });
   }
 
+  void listRemoveElementAt(RealmListHandle handle, int index) {
+    return using((Arena arena) {
+      _realmLib.invokeGetBool(() => _realmLib.realm_list_erase(handle._pointer, index));
+    });
+  }
+
   void listDeleteAll(RealmList list) {
     _realmLib.invokeGetBool(() => _realmLib.realm_list_remove_all(list.handle._pointer));
   }

test/list_test.dart

@@ -361,4 +361,27 @@ Future<void> main([List<String>? args]) async {
     final result = team.players.query(r'name BEGINSWITH $0', ['J']);
     expect(result, [person]);
   });
+
+  test('List removeAt', () {
+    final config = Configuration.local([Team.schema, Person.schema]);
+    final realm = getRealm(config);
+
+    final alice = Person('Alice');
+    final bob = Person('Bob');
+    final carol = Person('Carol');
+    final dan = Person('Dan');
+    final team = Team('Class of 92', players: [alice, bob, carol, dan]);
+
+    realm.write(() => realm.add(team));
+    expect(team.players.length, 4);
+    expect(team.players, [alice, bob, carol, dan]);
+
+    expect(realm.write(() => team.players.removeAt(2)), carol);
+    //expect(team.players.length, 3);
+    expect(team.players, [alice, bob, dan]);
+
+    expect(realm.write(() => team.players.removeAt(0)), alice);
+    expect(team.players.length, 2);
+    expect(team.players, [bob, dan]);
+  });
 }