Fix node duplication in scene sub-inheritance

scene/resources/packed_scene.cpp

@@ -1001,12 +1001,12 @@ int SceneState::find_node_by_path(const NodePath& p_node) const {
 		if (_get_base_scene_state().is_valid()) {
 			int idx = _get_base_scene_state()->find_node_by_path(p_node);
 			if (idx>=0) {
-				if (!base_scene_node_remap.has(idx)) {
-					int ridx = nodes.size() + base_scene_node_remap.size();
-					base_scene_node_remap[ridx]=idx;
+				int rkey=_find_base_scene_node_remap_key(idx);
+				if (rkey==-1) {
+					rkey=nodes.size() + base_scene_node_remap.size();
+					base_scene_node_remap[rkey]=idx;
 				}
-
-				return base_scene_node_remap[idx];
+				return rkey;
 			}
 		}
 		return -1;
@@ -1019,12 +1019,24 @@ int SceneState::find_node_by_path(const NodePath& p_node) const {
 		//the node in the instanced scene, as a property may be missing
 		//from the local one
 		int idx = _get_base_scene_state()->find_node_by_path(p_node);
-		base_scene_node_remap[nid]=idx;
-
+		if (idx!=-1) {
+			base_scene_node_remap[nid]=idx;
+		}
 	}
 
 	return nid;
 }
+
+int SceneState::_find_base_scene_node_remap_key(int p_idx) const {
+
+	for (Map<int, int>::Element* E=base_scene_node_remap.front();E;E=E->next()) {
+		if (E->value()==p_idx) {
+			return E->key();
+		}
+	}
+	return -1;
+}
+
 Variant SceneState::get_property_value(int p_node, const StringName& p_property, bool &found) const {
 
 	found=false;

scene/resources/packed_scene.h

@@ -104,6 +104,8 @@ class SceneState : public Reference {
 
 	DVector<String> _get_node_groups(int p_idx) const;
 
+	int _find_base_scene_node_remap_key(int p_idx) const;
+
 protected:
 
 	static void _bind_methods();

tools/editor/editor_node.cpp

@@ -1013,6 +1013,11 @@ void EditorNode::_save_scene(String p_file, int idx) {
 		return;
 	}
 
+	// force creation of node path cache
+	// (hacky but needed for the tree to update properly)
+	Node* dummy_scene=sdata->instance(true);
+	memdelete(dummy_scene);
+
 	sdata->set_import_metadata(editor_data.get_edited_scene_import_metadata(idx));
 	int flg=0;
 	if (EditorSettings::get_singleton()->get("on_save/compress_binary_resources"))
@@ -1023,6 +1028,7 @@ void EditorNode::_save_scene(String p_file, int idx) {
 
 
 	err = ResourceSaver::save(p_file,sdata,flg);
+
 	Map<RES,bool> processed;
 	_save_edited_subresources(scene,processed,flg);
 	editor_data.save_editor_external_data();