feat(class): ensure classes have names (#9097)

src/core/lv_obj_class.c

@@ -176,6 +176,7 @@ bool lv_obj_is_group_def(lv_obj_t * obj)
 
 static void lv_obj_construct(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
+    LV_ASSERT_NULL(class_p->name);
     if(obj->class_p->base_class) {
         const lv_obj_class_t * original_class_p = obj->class_p;
 

src/widgets/menu/lv_menu.c

@@ -81,18 +81,22 @@ const lv_obj_class_t lv_menu_separator_class = {
 
 const lv_obj_class_t lv_menu_sidebar_cont_class = {
     .base_class = &lv_obj_class,
+    .name = "lv_menu_sidebar",
 };
 
 const lv_obj_class_t lv_menu_main_cont_class = {
     .base_class = &lv_obj_class,
+    .name = "lv_menu_main_container",
 };
 
 const lv_obj_class_t lv_menu_main_header_cont_class = {
     .base_class = &lv_obj_class,
+    .name = "lv_menu_main_header",
 };
 
 const lv_obj_class_t lv_menu_sidebar_header_cont_class = {
     .base_class = &lv_obj_class,
+    .name = "lv_menu_sidebar_header",
 };
 
 static void lv_menu_refr(lv_obj_t * obj);