Merge pull request #25018 from AllanDaemon/#24895

Fix support for optional parameters in setters

modules/gdscript/gdscript_parser.cpp

@@ -7458,7 +7458,8 @@ void GDScriptParser::_check_class_level_types(ClassNode *p_class) {
 				found_setter = true;
 				FunctionNode *setter = p_class->functions[j];
 
-				if (setter->arguments.size() != 1) {
+				if (setter->get_required_argument_count() != 1 &&
+						!(setter->get_required_argument_count() == 0 && setter->default_values.size() > 0)) {
 					_set_error("Setter function needs to receive exactly 1 argument. See '" + setter->name +
 									   "()' definition at line " + itos(setter->line) + ".",
 							v.line);
@@ -7477,7 +7478,7 @@ void GDScriptParser::_check_class_level_types(ClassNode *p_class) {
 				found_getter = true;
 				FunctionNode *getter = p_class->functions[j];
 
-				if (getter->arguments.size() != 0) {
+				if (getter->get_required_argument_count() != 0) {
 					_set_error("Getter function can't receive arguments. See '" + getter->name +
 									   "()' definition at line " + itos(getter->line) + ".",
 							v.line);

modules/gdscript/gdscript_parser.h

@@ -221,6 +221,7 @@ public:
 
 		virtual DataType get_datatype() const { return return_type; }
 		virtual void set_datatype(const DataType &p_datatype) { return_type = p_datatype; }
+		int get_required_argument_count() { return arguments.size() - default_values.size(); }
 
 		FunctionNode() {
 			type = TYPE_FUNCTION;