Loader: forget menu position on main menu reentry, proper NULL arg passing. Gui: set current item for menu gui module. (#729)

applications/gui/modules/menu.c

@@ -160,6 +160,18 @@ void menu_clean(Menu* menu) {
         });
 }
 
+void menu_set_selected_item(Menu* menu, uint32_t index) {
+    with_view_model(
+        menu->view, (MenuModel * model) {
+            if(index >= MenuItemArray_size(model->items)) {
+                return false;
+            }
+
+            model->position = index;
+            return true;
+        });
+}
+
 static void menu_process_up(Menu* menu) {
     with_view_model(
         menu->view, (MenuModel * model) {

applications/gui/modules/menu.h

@@ -47,6 +47,12 @@ void menu_add_item(
  */
 void menu_clean(Menu* menu);
 
+/** Set current menu item
+ * @param submenu
+ * @param index
+ */
+void menu_set_selected_item(Menu* menu, uint32_t index);
+
 #ifdef __cplusplus
 }
 #endif