Fix weird menu bug when using down-arrow to open a menu

Author: notriddle

static/menu.js

@@ -49,6 +49,7 @@ const updateMenuPositionForSubMenu = (currentMenuSupplier) => {
     }
     backdrop.onclick = closeMenu;
     function openMenu(newMenu) {
+        updateMenuPositionForSubMenu(() => newMenu);
         currentMenu = newMenu;
         newMenu.className += " pure-menu-active";
         backdrop.style.display = "block";
@@ -63,8 +64,6 @@ const updateMenuPositionForSubMenu = (currentMenuSupplier) => {
         } else {
             if (currentMenu) closeMenu();
 
-            updateMenuPositionForSubMenu(() => this.parentNode);
-
             openMenu(this.parentNode);
         }
         e.preventDefault();