From e8e4cdd29db74ccd13f3078f93c59fb53c4a96d3 Mon Sep 17 00:00:00 2001
From: Magento EngCom Team <magento-engcom-team@magento.com>
Date: Wed, 24 Jan 2018 12:16:28 -0600
Subject: [PATCH] :arrow_double_up: Forwardport of magento/magento2#13030 to
 2.3-develop branch

Applied pull request patch https://github.com/magento/magento2/pull/13030.patch (created by @chiragp-wagento) based on commit(s):
  1. 0b69c1a8a92c1bc3a64bb8e006ff98a2cfb58bca
  2. 7783300d3dec5f51a7993417ee14d747edf9b64d
  3. 78f889456137dba01c0712b7bbd98ce8049261ca
  4. 1ac8ab250de45af0656c025d40cf58aa940884cb
---
 .../Magento/Checkout/view/frontend/templates/cart/coupon.phtml  | 2 +-
 .../SalesRule/view/frontend/web/template/payment/discount.html  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/app/code/Magento/Checkout/view/frontend/templates/cart/coupon.phtml b/app/code/Magento/Checkout/view/frontend/templates/cart/coupon.phtml
index b224c96f07e9b..1d67b325e01c5 100644
--- a/app/code/Magento/Checkout/view/frontend/templates/cart/coupon.phtml
+++ b/app/code/Magento/Checkout/view/frontend/templates/cart/coupon.phtml
@@ -24,7 +24,7 @@
                 <div class="field">
                     <label for="coupon_code" class="label"><span><?= /* @escapeNotVerified */ __('Enter discount code') ?></span></label>
                     <div class="control">
-                        <input type="text" class="input-text" id="coupon_code" name="coupon_code" value="<?= $block->escapeHtml($block->getCouponCode()) ?>" placeholder="<?= $block->escapeHtml(__('Enter discount code')) ?>" />
+                        <input type="text" class="input-text" id="coupon_code" name="coupon_code" value="<?= $block->escapeHtml($block->getCouponCode()) ?>" placeholder="<?= $block->escapeHtml(__('Enter discount code')) ?>" <?php if (strlen($block->getCouponCode())): ?> disabled="disabled" <?php endif; ?> />
                     </div>
                 </div>
                 <div class="actions-toolbar">
diff --git a/app/code/Magento/SalesRule/view/frontend/web/template/payment/discount.html b/app/code/Magento/SalesRule/view/frontend/web/template/payment/discount.html
index 7246460382fa7..d622b5ea5762d 100644
--- a/app/code/Magento/SalesRule/view/frontend/web/template/payment/discount.html
+++ b/app/code/Magento/SalesRule/view/frontend/web/template/payment/discount.html
@@ -27,7 +27,7 @@
                                id="discount-code"
                                name="discount_code"
                                data-validate="{'required-entry':true}"
-                               data-bind="value: couponCode, attr:{placeholder: $t('Enter discount code')} " />
+                               data-bind="value: couponCode, attr:{disabled:isApplied() , placeholder: $t('Enter discount code')} " />
                     </div>
                 </div>
             </div>