coupons effect are recalculated after each product's cart modification. Fix #237

core/lib/Thelia/Action/Coupon.php

@@ -161,6 +161,22 @@ class Coupon extends BaseAction implements EventSubscriberInterface
         $event->setDiscount($totalDiscount);
     }
 
+    public function updateOrderDiscount($event)
+    {
+
+        $discount = $this->couponManager->getDiscount();
+
+        $this->request
+            ->getSession()
+            ->getCart()
+            ->setDiscount($discount)
+            ->save();
+        $this->request
+            ->getSession()
+            ->getOrder()
+            ->setDiscount($discount);
+    }
+
     /**
      * Call the Model and delegate the create or delete action
      * Feed the Event with the updated model
@@ -310,6 +326,9 @@ class Coupon extends BaseAction implements EventSubscriberInterface
             TheliaEvents::COUPON_CONDITION_UPDATE => array("updateCondition", 128),
             TheliaEvents::ORDER_SET_POSTAGE => array("testFreePostage", 256),
             TheliaEvents::ORDER_BEFORE_PAYMENT => array("afterOrder", 128),
+            TheliaEvents::CART_ADDITEM => array("updateOrderDiscount", 10),
+            TheliaEvents::CART_UPDATEITEM => array("updateOrderDiscount", 10),
+            TheliaEvents::CART_DELETEITEM => array("updateOrderDiscount", 10),
         );
     }
 }