[qt] Use maxTxFee instead of 10000000

src/qt/sendcoinsdialog.cpp

@@ -530,7 +530,7 @@ void SendCoinsDialog::processSendCoinsReturn(const WalletModel::SendCoinsReturn
         msgParams.second = CClientUIInterface::MSG_ERROR;
         break;
     case WalletModel::AbsurdFee:
-        msgParams.first = tr("A fee higher than %1 is considered an absurdly high fee.").arg(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), 10000000));
+        msgParams.first = tr("A fee higher than %1 is considered an absurdly high fee.").arg(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), maxTxFee));
         break;
     case WalletModel::PaymentRequestExpired:
         msgParams.first = tr("Payment request expired.");

src/qt/walletmodel.cpp

@@ -290,8 +290,10 @@ WalletModel::SendCoinsReturn WalletModel::prepareTransaction(WalletModelTransact
             return TransactionCreationFailed;
         }
 
-        // reject absurdly high fee > 0.1 bitcoin
-        if (nFeeRequired > 10000000)
+        // reject absurdly high fee. (This can never happen because the
+        // wallet caps the fee at maxTxFee. This merely serves as a
+        // belt-and-suspenders check)
+        if (nFeeRequired > maxTxFee)
             return AbsurdFee;
     }