Adds sub-object specific clean functions to prevent breaking with lv_obj_clean

lv_objx/lv_list.c

@@ -133,6 +133,16 @@ lv_obj_t * lv_list_create(lv_obj_t * par, lv_obj_t * copy)
     return new_list;
 }
 
+/**
+ * Delete all children of the scrl object, without deleting scrl child.
+ * @param obj pointer to an object
+ */
+void lv_list_clean(lv_obj_t *obj)
+{
+    lv_obj_t *scrl = lv_page_get_scrl(obj);
+    lv_obj_clean(scrl);
+}
+
 /*======================
  * Add/remove functions
  *=====================*/