Add editor setting for instantiated scenes to have editable children by default

Author: Mohamad Al Kotob

doc/classes/EditorSettings.xml

@@ -320,6 +320,9 @@
 		<member name="docks/scene_tree/hide_filtered_out_parents" type="bool" setter="" getter="">
 			If [code]true[/code], the scene tree dock will only show nodes that match the filter, without showing parents that don't. This settings can also be changed in the Scene dock's top menu.
 		</member>
+		<member name="docks/scene_tree/enable_editable_children_by_default" type="bool" setter="" getter="">
+			If [code]true[/code], instantiated nodes will automatically have Editable Children set to [code]true[/code] in the scene tree dock.
+		</member>
 		<member name="docks/scene_tree/start_create_dialog_fully_expanded" type="bool" setter="" getter="">
 			If [code]true[/code], the Create dialog (Create New Node/Create New Resource) will start with all its sections expanded. Otherwise, sections will be collapsed until the user starts searching (which will automatically expand sections as needed).
 		</member>

editor/docks/scene_tree_dock.cpp

@@ -364,6 +364,8 @@ void SceneTreeDock::_perform_instantiate_scenes(const Vector<String> &p_files, N
 	undo_redo->create_action_for_history(TTRN("Instantiate Scene", "Instantiate Scenes", instances.size()), editor_data->get_current_edited_scene_history_id());
 	undo_redo->add_do_method(editor_selection, "clear");
 
+	bool enable_editable_children_by_default = EDITOR_GET("docks/scene_tree/enable_editable_children_by_default");
+
 	for (int i = 0; i < instances.size(); i++) {
 		Node *instantiated_scene = instances[i];
 
@@ -376,6 +378,11 @@ void SceneTreeDock::_perform_instantiate_scenes(const Vector<String> &p_files, N
 		undo_redo->add_do_reference(instantiated_scene);
 		undo_redo->add_undo_method(p_parent, "remove_child", instantiated_scene);
 
+		if (enable_editable_children_by_default) {
+			undo_redo->add_do_method(EditorNode::get_singleton()->get_edited_scene(), "set_editable_instance", instantiated_scene, true);
+			undo_redo->add_do_method(instantiated_scene, "set_display_folded", true);
+		}
+
 		String new_name = p_parent->validate_child_name(instantiated_scene);
 		EditorDebuggerNode *ed = EditorDebuggerNode::get_singleton();
 		undo_redo->add_do_method(ed, "live_debug_instantiate_node", edited_scene->get_path_to(p_parent), p_files[i], new_name);

editor/scene/3d/node_3d_editor_plugin.cpp

@@ -5718,6 +5718,11 @@ bool Node3DEditorViewport::_create_instance(Node *p_parent, const String &p_path
 	undo_redo->add_undo_method(p_parent, "remove_child", instantiated_scene);
 	undo_redo->add_do_method(editor_selection, "add_node", instantiated_scene);
 
+	if (EDITOR_GET("docks/scene_tree/enable_editable_children_by_default")) {
+		undo_redo->add_do_method(EditorNode::get_singleton()->get_edited_scene(), "set_editable_instance", instantiated_scene, true);
+		undo_redo->add_do_method(instantiated_scene, "set_display_folded", true);
+	}
+
 	String new_name = p_parent->validate_child_name(instantiated_scene);
 	EditorDebuggerNode *ed = EditorDebuggerNode::get_singleton();
 	undo_redo->add_do_method(ed, "live_debug_instantiate_node", EditorNode::get_singleton()->get_edited_scene()->get_path_to(p_parent), p_path, new_name);

editor/scene/canvas_item_editor_plugin.cpp

@@ -6421,6 +6421,11 @@ bool CanvasItemEditorViewport::_create_instance(Node *p_parent, const String &p_
 	undo_redo->add_undo_method(p_parent, "remove_child", instantiated_scene);
 	undo_redo->add_do_method(editor_selection, "add_node", instantiated_scene);
 
+	if (EDITOR_GET("docks/scene_tree/enable_editable_children_by_default")) {
+		undo_redo->add_do_method(EditorNode::get_singleton()->get_edited_scene(), "set_editable_instance", instantiated_scene, true);
+		undo_redo->add_do_method(instantiated_scene, "set_display_folded", true);
+	}
+
 	String new_name = p_parent->validate_child_name(instantiated_scene);
 	EditorDebuggerNode *ed = EditorDebuggerNode::get_singleton();
 	undo_redo->add_do_method(ed, "live_debug_instantiate_node", edited_scene->get_path_to(p_parent), p_path, new_name);

editor/settings/editor_settings.cpp

@@ -710,6 +710,7 @@ void EditorSettings::_load_defaults(Ref<ConfigFile> p_extra_config) {
 	_initial_set("docks/scene_tree/center_node_on_reparent", false);
 	_initial_set("docks/scene_tree/hide_filtered_out_parents", true);
 	_initial_set("docks/scene_tree/accessibility_warnings", false);
+	_initial_set("docks/scene_tree/enable_editable_children_by_default", false);
 
 	// FileSystem
 	EDITOR_SETTING(Variant::INT, PROPERTY_HINT_RANGE, "docks/filesystem/thumbnail_size", 64, "32,128,16")