SUPEE-7227: Refund Online did not create a new transaction record in Sales > Transactions and Order view > Transactions

- Merge of solution from MAGETWO-43948.

Author: Andrey Abumuslimov

app/code/Magento/Braintree/Model/PaymentMethod.php

@@ -11,6 +11,7 @@
 use \Braintree_Transaction;
 use \Braintree_Result_Successful;
 use Magento\Framework\Exception\LocalizedException;
+use Magento\Sales\Model\Order\Payment\Transaction;
 use Magento\Sales\Model\Resource\Order\Payment\Transaction\CollectionFactory as TransactionCollectionFactory;
 use Magento\Sales\Model\Order\Payment\Transaction as PaymentTransaction;
 use Magento\Payment\Model\InfoInterface;
@@ -636,13 +637,15 @@ public function refund(InfoInterface $payment, $amount)
                 }
             }
 
+            // transaction should be voided if it not settled
             $canVoid = ($transaction->status === \Braintree_Transaction::AUTHORIZED
                 || $transaction->status === \Braintree_Transaction::SUBMITTED_FOR_SETTLEMENT);
             $result = $canVoid
                 ? $this->braintreeTransaction->void($transactionId)
                 : $this->braintreeTransaction->refund($transactionId, $amount);
             $this->_debug($result);
             if ($result->success) {
+                $payment->setTransactionId($transactionId . '-' . Transaction::TYPE_REFUND);
                 $payment->setIsTransactionClosed(1);
             } else {
                 throw new LocalizedException($this->errorHelper->parseBraintreeError($result));

app/code/Magento/Braintree/Test/Unit/Model/PaymentMethodTest.php

@@ -8,6 +8,7 @@
 
 use Magento\Braintree\Model\PaymentMethod;
 use Magento\Framework\TestFramework\Unit\Helper\ObjectManager as ObjectManagerHelper;
+use Magento\Sales\Model\Order\Payment\Transaction;
 use \Magento\Sales\Model\Resource\Order\Payment\Transaction\CollectionFactory as TransactionCollectionFactory;
 use Magento\Framework\Exception\LocalizedException;
 use \Braintree_Result_Successful;
@@ -2327,6 +2328,7 @@ public function testRefund()
 
         $this->model->refund($paymentObject, $amount);
         $this->assertEquals(1, $paymentObject->getIsTransactionClosed());
+        $this->assertEquals($refundTransactionId . '-' .Transaction::TYPE_REFUND, $paymentObject->getTransactionId());
     }
 
     /**