MC-42813: Feature request: Cart qty update should be reverted back if the requested qty is not available

Author: dhorytskyi

app/code/Magento/Checkout/view/frontend/web/js/action/update-shopping-cart.js

@@ -108,14 +108,15 @@ define([
          */
         onError: function (response) {
             var that = this,
+                elm,
                 responseData = JSON.parse(response['error_message']);
 
             if (response['error_message']) {
                 try {
                     $.each(responseData, function (index, data) {
 
                         if (data.itemId !== undefined) {
-                            var elm = $('#cart-' + data.itemId + '-qty');
+                            elm = $('#cart-' + data.itemId + '-qty');
                             elm.val(elm.attr('data-item-qty'));
                         }
                         response['error_message'] = data.error;