MAGETWO-44405: Unable to change item cart qty from item configure page

Author: slopok

app/code/Magento/Catalog/view/frontend/requirejs-config.js

@@ -11,8 +11,6 @@ var config = {
             relatedProducts:        'Magento_Catalog/js/related-products',
             upsellProducts:         'Magento_Catalog/js/upsell-products',
             productListToolbarForm: 'Magento_Catalog/js/product/list/toolbar',
-            tierPrice:              'Magento_Catalog/js/tier-price',
-            addToCart:              'Magento_Msrp/js/msrp',
             catalogGallery:         'Magento_Catalog/js/gallery',
             priceBox:               'Magento_Catalog/js/price-box',
             priceOptionDate:        'Magento_Catalog/js/price-option-date',

app/code/Magento/Msrp/view/base/web/js/msrp.js

@@ -66,6 +66,7 @@ define([
 
             this.popupDOM = $(this.options.popUpAttr)[0];
             this.infoPopupDOM = $('[data-role=msrp-info-template]')[0];
+            $(this.options.cartButtonId).on('click', this._addToCartSubmit.bind(this));
 
             if (this.options.popupId) {
                 $('body').append($(this.popupDOM).html());
@@ -137,6 +138,29 @@ define([
         closePopup: function ($elem) {
             $elem.dropdownDialog('close');
             $(document).off('mouseup');
+        },
+
+        /**
+         * Handler for addToCart action
+         */
+        _addToCartSubmit: function () {
+            this.element.trigger('addToCart', this.element);
+
+            if (this.element.data('stop-processing')) {
+                return false;
+            }
+
+            if (this.options.addToCartButton) {
+                $(this.options.addToCartButton).click();
+
+                return false;
+            }
+
+            if (this.options.addToCartUrl) {
+                $('.mage-dropdown-dialog > .ui-dialog-content').dropdownDialog('close');
+            }
+            $(this.options.cartForm).submit();
+
         }
     });