Fix going forward backward in editor selection history.

editor/editor_node.cpp

@@ -2355,7 +2355,13 @@ static bool overrides_external_editor(Object *p_object) {
 
 void EditorNode::_add_to_history(const Object *p_object, const String &p_property, bool p_inspector_only) {
 	ObjectID id = p_object->get_instance_id();
-	if (id != editor_history.get_current()) {
+	ObjectID history_id = editor_history.get_current();
+	if (id != history_id) {
+		const MultiNodeEdit *multi_node_edit = Object::cast_to<const MultiNodeEdit>(p_object);
+		const MultiNodeEdit *history_multi_node_edit = Object::cast_to<const MultiNodeEdit>(ObjectDB::get_instance(history_id));
+		if (multi_node_edit && history_multi_node_edit && multi_node_edit->is_same_selection(history_multi_node_edit)) {
+			return;
+		}
 		if (p_inspector_only) {
 			editor_history.add_object(id, String(), true);
 		} else if (p_property.is_empty()) {
@@ -2449,6 +2455,7 @@ void EditorNode::_edit_current(bool p_skip_foreign, bool p_skip_inspector_update
 		if (current_node->is_inside_tree()) {
 			NodeDock::get_singleton()->set_node(current_node);
 			SceneTreeDock::get_singleton()->set_selected(current_node);
+			SceneTreeDock::get_singleton()->set_selection({ current_node });
 			InspectorDock::get_singleton()->update(current_node);
 			if (!inspector_only && !skip_main_plugin) {
 				skip_main_plugin = stay_in_script_editor_on_node_selected && !ScriptEditor::get_singleton()->is_editor_floating() && ScriptEditor::get_singleton()->is_visible_in_tree();
@@ -2470,13 +2477,13 @@ void EditorNode::_edit_current(bool p_skip_foreign, bool p_skip_inspector_update
 	} else {
 		Node *selected_node = nullptr;
 
+		Vector<Node *> multi_nodes;
 		if (current_obj->is_class("MultiNodeEdit")) {
 			Node *scene = get_edited_scene();
 			if (scene) {
 				MultiNodeEdit *multi_node_edit = Object::cast_to<MultiNodeEdit>(current_obj);
 				int node_count = multi_node_edit->get_node_count();
 				if (node_count > 0) {
-					List<Node *> multi_nodes;
 					for (int node_index = 0; node_index < node_count; ++node_index) {
 						Node *node = scene->get_node(multi_node_edit->get_node(node_index));
 						if (node) {
@@ -2486,7 +2493,7 @@ void EditorNode::_edit_current(bool p_skip_foreign, bool p_skip_inspector_update
 					if (!multi_nodes.is_empty()) {
 						// Pick the top-most node.
 						multi_nodes.sort_custom<Node::Comparator>();
-						selected_node = multi_nodes.front()->get();
+						selected_node = multi_nodes[0];
 					}
 				}
 			}
@@ -2495,6 +2502,7 @@ void EditorNode::_edit_current(bool p_skip_foreign, bool p_skip_inspector_update
 		InspectorDock::get_inspector_singleton()->edit(current_obj);
 		NodeDock::get_singleton()->set_node(nullptr);
 		SceneTreeDock::get_singleton()->set_selected(selected_node);
+		SceneTreeDock::get_singleton()->set_selection(multi_nodes);
 		InspectorDock::get_singleton()->update(nullptr);
 	}
 

editor/multi_node_edit.cpp

@@ -244,7 +244,7 @@ int MultiNodeEdit::get_node_count() const {
 }
 
 NodePath MultiNodeEdit::get_node(int p_index) const {
-	ERR_FAIL_INDEX_V(p_index, nodes.size(), NodePath());
+	ERR_FAIL_INDEX_V(p_index, get_node_count(), NodePath());
 	return nodes[p_index];
 }
 

editor/multi_node_edit.h

@@ -36,7 +36,7 @@
 class MultiNodeEdit : public RefCounted {
 	GDCLASS(MultiNodeEdit, RefCounted);
 
-	List<NodePath> nodes;
+	LocalVector<NodePath> nodes;
 	struct PLData {
 		int uses = 0;
 		PropertyInfo info;
@@ -67,6 +67,19 @@ public:
 
 	void set_property_field(const StringName &p_property, const Variant &p_value, const String &p_field);
 
+	// If the nodes selected are the same independently of order then return true.
+	bool is_same_selection(const MultiNodeEdit *p_other) const {
+		if (get_node_count() != p_other->get_node_count()) {
+			return false;
+		}
+		for (int i = 0; i < get_node_count(); i++) {
+			if (nodes.find(p_other->get_node(i)) == -1) {
+				return false;
+			}
+		}
+
+		return true;
+	}
 	MultiNodeEdit();
 };
 

editor/scene_tree_dock.cpp

@@ -3020,6 +3020,13 @@ void SceneTreeDock::set_edited_scene(Node *p_scene) {
 	edited_scene = p_scene;
 }
 
+void SceneTreeDock::set_selection(const Vector<Node *> &p_nodes) {
+	editor_selection->clear();
+	for (Node *node : p_nodes) {
+		editor_selection->add_node(node);
+	}
+}
+
 void SceneTreeDock::set_selected(Node *p_node, bool p_emit_selected) {
 	scene_tree->set_selected(p_node, p_emit_selected);
 }

editor/scene_tree_dock.h

@@ -322,6 +322,7 @@ public:
 	void set_edited_scene(Node *p_scene);
 	void instantiate(const String &p_file);
 	void instantiate_scenes(const Vector<String> &p_files, Node *p_parent = nullptr);
+	void set_selection(const Vector<Node *> &p_nodes);
 	void set_selected(Node *p_node, bool p_emit_selected = false);
 	void fill_path_renames(Node *p_node, Node *p_new_parent, HashMap<Node *, NodePath> *p_renames);
 	void perform_node_renames(Node *p_base, HashMap<Node *, NodePath> *p_renames, HashMap<Ref<Animation>, HashSet<int>> *r_rem_anims = nullptr);