Corrected Save Scene and Save All Scenes not working when the scene's dir no longer exists

(cherry picked from commit ed2280528f875d9fbaa6d07fd71bcf4931b0342e)

editor/editor_node.cpp

@@ -1613,13 +1613,15 @@ void EditorNode::restart_editor() {
 void EditorNode::_save_all_scenes() {
 	for (int i = 0; i < editor_data.get_edited_scene_count(); i++) {
 		Node *scene = editor_data.get_edited_scene_root(i);
-		if (scene && scene->get_filename() != "") {
+		if (scene && scene->get_filename() != "" && DirAccess::exists(scene->get_filename().get_base_dir())) {
 			if (i != editor_data.get_edited_scene()) {
 				_save_scene(scene->get_filename(), i);
 			} else {
 				_save_scene_with_preview(scene->get_filename());
 			}
-		} // else: ignore new scenes
+		} else {
+			show_warning(TTR("Could not save one or more scenes!"), TTR("Save All Scenes"));
+		}
 	}
 
 	_save_default_environment();
@@ -2345,20 +2347,22 @@ void EditorNode::_menu_option_confirm(int p_option, bool p_confirmed) {
 		case SCENE_TAB_CLOSE:
 		case FILE_SAVE_SCENE: {
 			int scene_idx = (p_option == FILE_SAVE_SCENE) ? -1 : tab_closing;
-
 			Node *scene = editor_data.get_edited_scene_root(scene_idx);
 			if (scene && scene->get_filename() != "") {
-				if (scene_idx != editor_data.get_edited_scene()) {
-					_save_scene_with_preview(scene->get_filename(), scene_idx);
-				} else {
-					_save_scene_with_preview(scene->get_filename());
-				}
+				if (DirAccess::exists(scene->get_filename().get_base_dir())) {
+					if (scene_idx != editor_data.get_edited_scene()) {
+						_save_scene_with_preview(scene->get_filename(), scene_idx);
+					} else {
+						_save_scene_with_preview(scene->get_filename());
+					}
 
-				if (scene_idx != -1) {
-					_discard_changes();
+					if (scene_idx != -1) {
+						_discard_changes();
+					}
+					save_layout();
+				} else {
+					show_save_accept(vformat(TTR("%s no longer exists! Please specify a new save location."), scene->get_filename().get_base_dir()), TTR("OK"));
 				}
-				save_layout();
-
 				break;
 			}
 			FALLTHROUGH;
@@ -4131,6 +4135,13 @@ void EditorNode::show_accept(const String &p_text, const String &p_title) {
 	accept->popup_centered_minsize();
 }
 
+void EditorNode::show_save_accept(const String &p_text, const String &p_title) {
+	current_option = -1;
+	save_accept->get_ok()->set_text(p_title);
+	save_accept->set_text(p_text);
+	save_accept->popup_centered();
+}
+
 void EditorNode::show_warning(const String &p_text, const String &p_title) {
 	if (warning->is_inside_tree()) {
 		warning->set_text(p_text);
@@ -6178,6 +6189,10 @@ EditorNode::EditorNode() {
 	gui_base->add_child(accept);
 	accept->connect("confirmed", this, "_menu_confirm_current");
 
+	save_accept = memnew(AcceptDialog);
+	gui_base->add_child(save_accept);
+	save_accept->connect("confirmed", this, "_menu_option", make_binds((int)MenuOptions::FILE_SAVE_AS_SCENE));
+
 	project_export = memnew(ProjectExportDialog);
 	gui_base->add_child(project_export);
 

editor/editor_node.h

@@ -311,6 +311,7 @@ private:
 	ConfirmationDialog *pick_main_scene;
 	Button *select_current_scene_button;
 	AcceptDialog *accept;
+	AcceptDialog *save_accept;
 	EditorAbout *about;
 	AcceptDialog *warning;
 
@@ -802,6 +803,7 @@ public:
 	Ref<Texture> get_class_icon(const String &p_class, const String &p_fallback = "Object") const;
 
 	void show_accept(const String &p_text, const String &p_title);
+	void show_save_accept(const String &p_text, const String &p_title);
 	void show_warning(const String &p_text, const String &p_title = TTR("Warning!"));
 
 	void _copy_warning(const String &p_str);