Warn when creating a script with the same name as the parent class

(cherry picked from commit 5a9037f828ce84a07c3e748e20b50b334b896991)

editor/script_create_dialog.cpp

@@ -225,6 +225,14 @@ String ScriptCreateDialog::_validate_path(const String &p_path, bool p_file_must
 	return "";
 }
 
+String ScriptCreateDialog::_get_class_name() const {
+	if (has_named_classes) {
+		return class_name->get_text();
+	} else {
+		return ProjectSettings::get_singleton()->localize_path(file_path->get_text()).get_file().get_basename();
+	}
+}
+
 void ScriptCreateDialog::_class_name_changed(const String &p_name) {
 
 	if (_validate_class(class_name->get_text())) {
@@ -278,14 +286,7 @@ void ScriptCreateDialog::ok_pressed() {
 }
 
 void ScriptCreateDialog::_create_new() {
-
-	String cname_param;
-
-	if (has_named_classes) {
-		cname_param = class_name->get_text();
-	} else {
-		cname_param = ProjectSettings::get_singleton()->localize_path(file_path->get_text()).get_file().get_basename();
-	}
+	String cname_param = _get_class_name();
 
 	Ref<Script> scr;
 	if (script_template != "") {
@@ -690,6 +691,10 @@ void ScriptCreateDialog::_update_dialog() {
 
 	builtin_warning_label->set_visible(is_built_in);
 
+	// Check if the script name is the same as the parent class.
+	// This warning isn't relevant if the script is built-in.
+	script_name_warning_label->set_visible(!is_built_in && _get_class_name() == parent_name->get_text());
+
 	if (is_built_in) {
 		get_ok()->set_text(TTR("Create"));
 		parent_name->set_editable(true);
@@ -775,6 +780,14 @@ ScriptCreateDialog::ScriptCreateDialog() {
 	builtin_warning_label->set_autowrap(true);
 	builtin_warning_label->hide();
 
+	script_name_warning_label = memnew(Label);
+	script_name_warning_label->set_text(
+			TTR("Warning: Having the script name be the same as a built-in type is usually not desired."));
+	vb->add_child(script_name_warning_label);
+	script_name_warning_label->add_color_override("font_color", Color(1, 0.85, 0.4));
+	script_name_warning_label->set_autowrap(true);
+	script_name_warning_label->hide();
+
 	status_panel = memnew(PanelContainer);
 	status_panel->set_h_size_flags(Control::SIZE_FILL);
 	status_panel->add_child(vb);

editor/script_create_dialog.h

@@ -49,6 +49,7 @@ class ScriptCreateDialog : public ConfirmationDialog {
 	Label *error_label;
 	Label *path_error_label;
 	Label *builtin_warning_label;
+	Label *script_name_warning_label;
 	PanelContainer *status_panel;
 	LineEdit *parent_name;
 	Button *parent_browse_button;
@@ -109,6 +110,7 @@ class ScriptCreateDialog : public ConfirmationDialog {
 	bool _validate_parent(const String &p_string);
 	bool _validate_class(const String &p_string);
 	String _validate_path(const String &p_path, bool p_file_must_exist);
+	String _get_class_name() const;
 	void _class_name_changed(const String &p_name);
 	void _parent_name_changed(const String &p_parent);
 	void _template_changed(int p_template = 0);