Mono: Fix hot-reloading of nested classes

modules/mono/csharp_script.cpp

@@ -850,7 +850,7 @@ void CSharpLanguage::reload_assemblies(bool p_soft_reload) {
 		to_reload.push_back(script);
 
 		if (script->get_path().empty()) {
-			script->tied_class_name_for_reload = script->script_class->get_name();
+			script->tied_class_name_for_reload = script->script_class->get_name_for_lookup();
 			script->tied_class_namespace_for_reload = script->script_class->get_namespace();
 		}
 

modules/mono/mono_gd/gd_mono_class.cpp

@@ -79,12 +79,26 @@ bool GDMonoClass::is_assignable_from(GDMonoClass *p_from) const {
 	return mono_class_is_assignable_from(mono_class, p_from->mono_class);
 }
 
-GDMonoClass *GDMonoClass::get_parent_class() {
+StringName GDMonoClass::get_namespace() const {
+	GDMonoClass *nesting_class = get_nesting_class();
+	if (!nesting_class)
+		return namespace_name;
+	return nesting_class->get_namespace();
+}
+
+String GDMonoClass::get_name_for_lookup() const {
+	GDMonoClass *nesting_class = get_nesting_class();
+	if (!nesting_class)
+		return class_name;
+	return nesting_class->get_name_for_lookup() + "/" + class_name;
+}
+
+GDMonoClass *GDMonoClass::get_parent_class() const {
 	MonoClass *parent_mono_class = mono_class_get_parent(mono_class);
 	return parent_mono_class ? GDMono::get_singleton()->get_class(parent_mono_class) : nullptr;
 }
 
-GDMonoClass *GDMonoClass::get_nesting_class() {
+GDMonoClass *GDMonoClass::get_nesting_class() const {
 	MonoClass *nesting_type = mono_class_get_nesting_type(mono_class);
 	return nesting_type ? GDMono::get_singleton()->get_class(nesting_type) : nullptr;
 }

modules/mono/mono_gd/gd_mono_class.h

@@ -113,14 +113,15 @@ public:
 
 	bool is_assignable_from(GDMonoClass *p_from) const;
 
-	_FORCE_INLINE_ StringName get_namespace() const { return namespace_name; }
+	StringName get_namespace() const;
 	_FORCE_INLINE_ StringName get_name() const { return class_name; }
+	String get_name_for_lookup() const;
 
 	_FORCE_INLINE_ MonoClass *get_mono_ptr() const { return mono_class; }
 	_FORCE_INLINE_ const GDMonoAssembly *get_assembly() const { return assembly; }
 
-	GDMonoClass *get_parent_class();
-	GDMonoClass *get_nesting_class();
+	GDMonoClass *get_parent_class() const;
+	GDMonoClass *get_nesting_class() const;
 
 #ifdef TOOLS_ENABLED
 	Vector<MonoClassField *> get_enum_fields();