ACP2E-1290: Cart Rule discount issue on shipping price

Author: bubasuma

app/code/Magento/SalesRule/i18n/en_US.csv

@@ -168,3 +168,4 @@ Apply,Apply
 "Trigger recollect totals for quotes by rule ID %1","Trigger recollect totals for quotes by rule ID %1"
 "Sorry, something went wrong while triggering recollect totals for affected quotes. Please see log for details.","Sorry, something went wrong while triggering recollect totals for affected quotes. Please see log for details."
 "When coupon quantity exceeds %1, the coupon code length must be minimum %2", "When coupon quantity exceeds %1, the coupon code length must be minimum %2"
+"Discount amount is distributed among subtotal and shipping amount. Cases when multiple discounts applied to shipping amount are not supported. The option is going to be removed in future releases.ly","Discount amount is distributed among subtotal and shipping amount. Cases when multiple discounts applied to shipping amount are not supported. The option is going to be removed in future releases."

app/code/Magento/SalesRule/view/adminhtml/ui_component/sales_rule_form.xml

@@ -472,6 +472,9 @@
                         <item name="0" xsi:type="string" translate="true">Discount amount is applied to subtotal only</item>
                         <item name="1" xsi:type="string" translate="true">Discount amount is applied to subtotal and shipping amount separately</item>
                     </item>
+                    <item name="noticePerSimpleAction" xsi:type="array">
+                        <item name="cart_fixed" xsi:type="string" translate="true">Discount amount is distributed among subtotal and shipping amount. Cases when multiple discounts applied to shipping amount are not supported. The option is going to be removed in future releases.</item>
+                    </item>
                 </item>
             </argument>
             <settings>

app/code/Magento/SalesRule/view/adminhtml/web/js/form/element/apply_to_shipping.js

@@ -12,7 +12,9 @@ define([
         defaults: {
             imports: {
                 toggleDisabled: '${ $.parentName }.simple_action:value'
-            }
+            },
+            noticePerSimpleAction: {},
+            selectedSimpleAction: ''
         },
 
         /**
@@ -29,6 +31,21 @@ define([
             if (this.disabled()) {
                 this.checked(false);
             }
+            this.selectedSimpleAction = action;
+            this.chooseNotice();
+        },
+
+        /**
+         * @inheritdoc
+         */
+        chooseNotice: function () {
+            var checkedNoticeNumber = Number(this.checked());
+
+            if (checkedNoticeNumber === 1 && this.noticePerSimpleAction.hasOwnProperty(this.selectedSimpleAction)) {
+                this.notice = this.noticePerSimpleAction[this.selectedSimpleAction];
+            } else {
+                this._super();
+            }
         }
     });
 });