Fixed inserting the tx twice

Breeze/src/Breeze.Wallet/WalletManager.cs

@@ -491,7 +491,12 @@ namespace Breeze.Wallet
         /// <param name="spendingTransactionIndex">The index of the output in the transaction being referenced, if this is a spending transaction.</param>
         private void AddTransactionToWallet(uint256 transactionHash, uint time, int? index, Money amount, Script script, int? blockHeight = null, uint? blockTime = null, uint256 spendingTransactionId = null, int? spendingTransactionIndex = null)
         {
+            // get the collection of transactions to add to.
             this.keysLookup.TryGetValue(script, out ICollection<TransactionData> trans);
+
+            // if it's the first time we see this transaction
+            if (trans != null && trans.All(t => t.Id != transactionHash))
+            {
                 trans.Add(new TransactionData
                 {
                     Amount = amount,
@@ -511,6 +516,15 @@ namespace Breeze.Wallet
                         transactions.Single(t => t.Index == spendingTransactionIndex).SpentInTransaction = transactionHash;
                     }
                 }
+            }
+            else if (trans.Any(t => t.Id == transactionHash && !t.Confirmed)) // if this is an unconfirmed transaction now received in a block
+            {
+                var foundTransaction = trans.Single(t => t.Id == transactionHash && !t.Confirmed);
+                if (blockHeight != null)
+                {
+                    foundTransaction.Confirmed = true;
+                }
+            }
 
             // notify a transaction has been found
             this.TransactionFound?.Invoke(this, new TransactionFoundEventArgs(script, transactionHash));