Save the current script when pressing Ctrl + S if no scene is open

- Tweak the dialog messages to be more informative.
  - The "Saved N modified resources" dialog is not a warning per se,
    so make it more explicit.

(cherry picked from commit 39f9b92f54)

editor/editor_node.cpp

@@ -2352,15 +2352,24 @@ void EditorNode::_menu_option_confirm(int p_option, bool p_confirmed) {
 			Node *scene = editor_data.get_edited_scene_root(scene_idx);
 
 			if (!scene) {
-				int saved = _save_external_resources();
-				String err_text;
-				if (saved > 0) {
-					err_text = vformat(TTR("Saved %s modified resource(s)."), itos(saved));
-				} else {
-					err_text = TTR("A root node is required to save the scene.");
+				if (p_option == FILE_SAVE_SCENE) {
+					// Pressing Ctrl + S saves the current script if a scene is currently open, but it won't if the scene has no root node.
+					// Work around this by explicitly saving the script in this case (similar to pressing Ctrl + Alt + S).
+					ScriptEditor::get_singleton()->save_current_script();
+				}
+
+				const int saved = _save_external_resources();
+				if (saved > 0) {
+					show_accept(
+							vformat(TTR("The current scene has no root node, but %d modified external resource(s) were saved anyway."), saved),
+							TTR("OK"));
+				} else if (p_option == FILE_SAVE_AS_SCENE) {
+					// Don't show this dialog when pressing Ctrl + S to avoid interfering with script saving.
+					show_accept(
+							TTR("A root node is required to save the scene. You can add a root node using the Scene tree dock."),
+							TTR("OK"));
 				}
 
-				show_accept(err_text, TTR("OK"));
 				break;
 			}
 

editor/plugins/script_editor_plugin.cpp

@@ -551,7 +551,7 @@ void ScriptEditor::_close_tab(int p_idx, bool p_save, bool p_history_back) {
 		if (p_save) {
 			// Do not try to save internal scripts
 			if (!script.is_valid() || !(script->get_path() == "" || script->get_path().find("local://") != -1 || script->get_path().find("::") != -1)) {
-				_save_current_script();
+				save_current_script();
 			}
 		}
 
@@ -948,39 +948,6 @@ bool ScriptEditor::is_scripts_panel_toggled() {
 	return list_split->is_visible();
 }
 
-void ScriptEditor::_save_current_script() {
-	ScriptEditorBase *current = _get_current_editor();
-
-	if (_test_script_times_on_disk()) {
-		return;
-	}
-
-	if (trim_trailing_whitespace_on_save) {
-		current->trim_trailing_whitespace();
-	}
-
-	current->insert_final_newline();
-
-	if (convert_indent_on_save) {
-		if (use_space_indentation) {
-			current->convert_indent_to_spaces();
-		} else {
-			current->convert_indent_to_tabs();
-		}
-	}
-
-	RES resource = current->get_edited_resource();
-	Ref<TextFile> text_file = resource;
-
-	if (text_file != nullptr) {
-		current->apply_code();
-		_save_text_file(text_file, text_file->get_path());
-		return;
-	}
-
-	editor->save_resource(resource);
-}
-
 void ScriptEditor::_menu_option(int p_option) {
 	ScriptEditorBase *current = _get_current_editor();
 	switch (p_option) {
@@ -1122,7 +1089,7 @@ void ScriptEditor::_menu_option(int p_option) {
 	if (current) {
 		switch (p_option) {
 			case FILE_SAVE: {
-				_save_current_script();
+				save_current_script();
 			} break;
 			case FILE_SAVE_AS: {
 				if (trim_trailing_whitespace_on_save) {
@@ -2182,6 +2149,39 @@ bool ScriptEditor::edit(const RES &p_resource, int p_line, int p_col, bool p_gra
 	return true;
 }
 
+void ScriptEditor::save_current_script() {
+	ScriptEditorBase *current = _get_current_editor();
+
+	if (_test_script_times_on_disk()) {
+		return;
+	}
+
+	if (trim_trailing_whitespace_on_save) {
+		current->trim_trailing_whitespace();
+	}
+
+	current->insert_final_newline();
+
+	if (convert_indent_on_save) {
+		if (use_space_indentation) {
+			current->convert_indent_to_spaces();
+		} else {
+			current->convert_indent_to_tabs();
+		}
+	}
+
+	RES resource = current->get_edited_resource();
+	Ref<TextFile> text_file = resource;
+
+	if (text_file != nullptr) {
+		current->apply_code();
+		_save_text_file(text_file, text_file->get_path());
+		return;
+	}
+
+	editor->save_resource(resource);
+}
+
 void ScriptEditor::save_all_scripts() {
 	for (int i = 0; i < tab_container->get_child_count(); i++) {
 		ScriptEditorBase *se = Object::cast_to<ScriptEditorBase>(tab_container->get_child(i));
@@ -2292,7 +2292,7 @@ void ScriptEditor::_add_callback(Object *p_obj, const String &p_function, const
 		script_list->select(script_list->find_metadata(i));
 
 		// Save the current script so the changes can be picked up by an external editor.
-		_save_current_script();
+		save_current_script();
 
 		break;
 	}

editor/plugins/script_editor_plugin.h

@@ -276,7 +276,6 @@ class ScriptEditor : public PanelContainer {
 
 	String _get_debug_tooltip(const String &p_text, Node *_se);
 
-	void _save_current_script();
 	void _resave_scripts(const String &p_str);
 	void _reload_scripts();
 
@@ -428,6 +427,7 @@ public:
 
 	void get_breakpoints(List<String> *p_breakpoints);
 
+	void save_current_script();
 	void save_all_scripts();
 
 	void set_window_layout(Ref<ConfigFile> p_layout);