Remove unused `SceneTree::make_group_changed`

scene/main/scene_tree.cpp

@@ -186,14 +186,6 @@ void SceneTree::remove_from_group(const StringName &p_group, Node *p_node) {
 	}
 }
 
-void SceneTree::make_group_changed(const StringName &p_group) {
-	_THREAD_SAFE_METHOD_
-	HashMap<StringName, Group>::Iterator E = group_map.find(p_group);
-	if (E) {
-		E->value.changed = true;
-	}
-}
-
 void SceneTree::flush_transform_notifications() {
 	_THREAD_SAFE_METHOD_
 

scene/main/scene_tree.h

@@ -227,7 +227,6 @@ private:
 
 	Group *add_to_group(const StringName &p_group, Node *p_node);
 	void remove_from_group(const StringName &p_group, Node *p_node);
-	void make_group_changed(const StringName &p_group);
 
 	void _process_group(ProcessGroup *p_group, bool p_physics);
 	void _process_groups_thread(uint32_t p_index, bool p_physics);