Fix missing discount label in checkout

Author: ihor-sviziev

app/code/Magento/SalesRule/view/frontend/web/js/view/summary/discount.js

@@ -44,6 +44,23 @@ define([
             return this.totals()['coupon_label'];
         },
 
+        /**
+         * Get discount title
+         *
+         * @returns {null|string}
+         */
+        getTitle: function () {
+            if (!this.totals()) {
+                return null;
+            }
+
+            var discountSegments = this.totals()['total_segments'].filter(function (segment) {
+                return (segment.code === 'discount');
+            });
+
+            return discountSegments.length ? discountSegments[0].title : null;
+        },
+
         /**
          * @return {Number}
          */

app/code/Magento/SalesRule/view/frontend/web/template/cart/totals/discount.html

@@ -7,7 +7,7 @@
 <!-- ko if: isDisplayed() -->
 <tr class="totals">
     <th colspan="1" style="" class="mark" scope="row">
-        <span class="title" data-bind="text: title"></span>
+        <span class="title" data-bind="text: getTitle()"></span>
         <span class="discount coupon" data-bind="text: getCouponLabel()"></span>
     </th>
     <td class="amount" data-bind="attr: {'data-th': title}">

app/code/Magento/SalesRule/view/frontend/web/template/summary/discount.html

@@ -7,7 +7,7 @@
 <!-- ko if: isDisplayed() -->
 <tr class="totals discount">
     <th class="mark" scope="row">
-        <span class="title" data-bind="text: title"></span>
+        <span class="title" data-bind="text: getTitle()"></span>
         <span class="discount coupon" data-bind="text: getCouponCode()"></span>
     </th>
     <td class="amount">

app/design/frontend/Magento/blank/Magento_Checkout/web/css/source/module/_cart.less

@@ -80,6 +80,10 @@
             margin-bottom: 0;
             overflow: inherit;
         }
+
+        .discount.coupon {
+            display: none;
+        }
     }
 
     //  Products table

app/design/frontend/Magento/blank/Magento_Checkout/web/css/source/module/checkout/_order-summary.less

@@ -49,6 +49,10 @@
             }
         }
 
+        .discount.coupon {
+            display: none;
+        }
+
         .grand.incl {
             & + .grand.excl {
                 .mark,

app/design/frontend/Magento/luma/Magento_Checkout/web/css/source/module/_cart.less

@@ -166,6 +166,10 @@
                 text-align: left;
             }
         }
+
+        .discount.coupon {
+            display: none;
+        }
     }
 
     //  Products table

app/design/frontend/Magento/luma/Magento_Checkout/web/css/source/module/checkout/_order-summary.less

@@ -49,6 +49,10 @@
             }
         }
 
+        .discount.coupon {
+            display: none;
+        }
+
         .grand.incl {
             & + .grand.excl {
                 .mark,