[bisq-network/bisq] Prevent dust outputs from being created during withdraw from wallet (#4093)

[James Cox]

@jmacxx commented on this pull request.



> @@ -330,8 +331,9 @@ private void onWithdraw() {
                     feeEstimationTransaction = walletService.getFeeEstimationTransactionForMultipleAddresses(fromAddresses, sendersAmount);
                 }
                 checkNotNull(feeEstimationTransaction, "feeEstimationTransaction must not be null");
-                Coin fee = feeEstimationTransaction.getFee();
-                sendersAmount = feeExcluded ? amountAsCoin.add(fee) : amountAsCoin;
+                Coin dust = getDust(feeEstimationTransaction);
+                Coin fee = feeEstimationTransaction.getFee().add(dust);
+                sendersAmount = feeExcluded ? amountAsCoin.add(fee) : amountAsCoin.add(dust);

> adding a notice to the user that dust might be padded to the fee

I propose the following message in cases where dust is detected (shown in the following screenshot at the top of the popup):

![image](https://user-images.githubusercontent.com/47253594/77838615-39813680-713b-11ea-96e5-9c651911a0e9.png)


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