Fix editing exports in a base script not propagating the change to the opened property editor

This patch fixes the user having to navigate away from the selected node which has the derived script attached and back to see the changes of the base script exports reflected in the property editor.

modules/gdscript/gdscript.cpp

@@ -278,6 +278,7 @@ struct _GDScriptMemberSort {
 void GDScript::_placeholder_erased(PlaceHolderScriptInstance *p_placeholder) {
 	placeholders.erase(p_placeholder);
 }
+
 #endif
 
 void GDScript::_get_script_method_list(List<MethodInfo> *r_list, bool p_include_base) const {
@@ -464,7 +465,7 @@ String GDScript::get_class_icon_path() const {
 }
 #endif
 
-bool GDScript::_update_exports(bool *r_err, bool p_recursive_call, PlaceHolderScriptInstance *p_instance_to_update) {
+bool GDScript::_update_exports(bool *r_err, bool p_recursive_call, PlaceHolderScriptInstance *p_instance_to_update, bool p_base_exports_changed) {
 #ifdef TOOLS_ENABLED
 
 	static Vector<GDScript *> base_caches;
@@ -473,7 +474,7 @@ bool GDScript::_update_exports(bool *r_err, bool p_recursive_call, PlaceHolderSc
 	}
 	base_caches.append(this);
 
-	bool changed = false;
+	bool changed = p_base_exports_changed;
 
 	if (source_changed_cache) {
 		source_changed_cache = false;
@@ -600,9 +601,15 @@ bool GDScript::_update_exports(bool *r_err, bool p_recursive_call, PlaceHolderSc
 
 void GDScript::update_exports() {
 #ifdef TOOLS_ENABLED
+	_update_exports_down(false);
+#endif
+}
 
+#ifdef TOOLS_ENABLED
+void GDScript::_update_exports_down(bool p_base_exports_changed) {
 	bool cyclic_error = false;
-	_update_exports(&cyclic_error);
+	bool changed = _update_exports(&cyclic_error, false, nullptr, p_base_exports_changed);
+
 	if (cyclic_error) {
 		return;
 	}
@@ -612,14 +619,14 @@ void GDScript::update_exports() {
 	for (const ObjectID &E : copy) {
 		Object *id = ObjectDB::get_instance(E);
 		GDScript *s = Object::cast_to<GDScript>(id);
+
 		if (!s) {
 			continue;
 		}
-		s->update_exports();
+		s->_update_exports_down(p_base_exports_changed || changed);
 	}
-
-#endif
 }
+#endif
 
 String GDScript::_get_debug_path() const {
 	if (is_built_in() && !get_name().is_empty()) {

modules/gdscript/gdscript.h

@@ -163,13 +163,14 @@ class GDScript : public Script {
 	HashSet<PlaceHolderScriptInstance *> placeholders;
 	//void _update_placeholder(PlaceHolderScriptInstance *p_placeholder);
 	virtual void _placeholder_erased(PlaceHolderScriptInstance *p_placeholder) override;
+	void _update_exports_down(bool p_base_exports_changed);
 #endif
 
 #ifdef DEBUG_ENABLED
 	HashMap<ObjectID, List<Pair<StringName, Variant>>> pending_reload_state;
 #endif
 
-	bool _update_exports(bool *r_err = nullptr, bool p_recursive_call = false, PlaceHolderScriptInstance *p_instance_to_update = nullptr);
+	bool _update_exports(bool *r_err = nullptr, bool p_recursive_call = false, PlaceHolderScriptInstance *p_instance_to_update = nullptr, bool p_base_exports_changed = false);
 
 	void _save_orphaned_subclasses(GDScript::ClearData *p_clear_data);