4 files changed, 31 insertions, 8 deletions
diff --git a/src/qt/clientmodel.cpp b/src/qt/clientmodel.cpp
index a4b028f0d0..1271187420 100644
--- a/src/qt/clientmodel.cpp
+++ b/src/qt/clientmodel.cpp
@@ -253,7 +253,10 @@ static void BlockTipChanged(ClientModel *clientmodel, bool initialSync, const CB
     // if we are in-sync, update the UI regardless of last update time
     if (!initialSync || now - nLastBlockTipUpdateNotification > MODEL_UPDATE_DELAY) {
         //pass a async signal to the UI thread
-        Q_EMIT clientmodel->numBlocksChanged(pIndex->nHeight, QDateTime::fromTime_t(pIndex->GetBlockTime()), clientmodel->getVerificationProgress(pIndex));
+        QMetaObject::invokeMethod(clientmodel, "numBlocksChanged", Qt::QueuedConnection,
+                                  Q_ARG(int, pIndex->nHeight),
+                                  Q_ARG(QDateTime, QDateTime::fromTime_t(pIndex->GetBlockTime())),
+                                  Q_ARG(double, clientmodel->getVerificationProgress(pIndex)));
         nLastBlockTipUpdateNotification = now;
     }
 }
diff --git a/src/qt/coincontroldialog.cpp b/src/qt/coincontroldialog.cpp
index cbc41f3416..0f42243047 100644
--- a/src/qt/coincontroldialog.cpp
+++ b/src/qt/coincontroldialog.cpp
@@ -549,6 +549,9 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
 
         // Fee
         nPayFee = CWallet::GetMinimumFee(nBytes, nTxConfirmTarget, mempool);
+        if (nPayFee > 0 && coinControl->nMinimumTotalFee > nPayFee)
+            nPayFee = coinControl->nMinimumTotalFee;
+
 
         // Allow free? (require at least hard-coded threshold and default to that if no estimate)
         double dPriorityNeeded = std::max(mempoolEstimatePriority, AllowFreeThreshold());
@@ -619,7 +622,7 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
     l6->setText(sPriorityLabel);                                             // Priority
     l7->setText(fDust ? tr("yes") : tr("no"));                               // Dust
     l8->setText(BitcoinUnits::formatWithUnit(nDisplayUnit, nChange));        // Change
-    if (nPayFee > 0 && !(payTxFee.GetFeePerK() > 0 && fPayAtLeastCustomFee && nBytes < 1000))
+    if (nPayFee > 0 && (coinControl->nMinimumTotalFee < nPayFee))
     {
         l3->setText(ASYMP_UTF8 + l3->text());
         l4->setText(ASYMP_UTF8 + l4->text());
diff --git a/src/qt/paymentrequestplus.cpp b/src/qt/paymentrequestplus.cpp
index 1f54c62b6e..1000c143f3 100644
--- a/src/qt/paymentrequestplus.cpp
+++ b/src/qt/paymentrequestplus.cpp
@@ -201,7 +201,7 @@ QList<std::pair<CScript,CAmount> > PaymentRequestPlus::getPayTo() const
         const unsigned char* scriptStr = (const unsigned char*)details.outputs(i).script().data();
         CScript s(scriptStr, scriptStr+details.outputs(i).script().size());
 
-        result.append(make_pair(s, details.outputs(i).amount()));
+        result.append(std::make_pair(s, details.outputs(i).amount()));
     }
     return result;
 }
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index 0fd86da034..ec4e598bf9 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -585,7 +585,7 @@ void SendCoinsDialog::updateFeeSectionControls()
     ui->checkBoxMinimumFee      ->setEnabled(ui->radioCustomFee->isChecked());
     ui->labelMinFeeWarning      ->setEnabled(ui->radioCustomFee->isChecked());
     ui->radioCustomPerKilobyte  ->setEnabled(ui->radioCustomFee->isChecked() && !ui->checkBoxMinimumFee->isChecked());
-    ui->radioCustomAtLeast      ->setEnabled(ui->radioCustomFee->isChecked() && !ui->checkBoxMinimumFee->isChecked());
+    ui->radioCustomAtLeast      ->setEnabled(ui->radioCustomFee->isChecked() && !ui->checkBoxMinimumFee->isChecked() && CoinControlDialog::coinControl->HasSelected());
     ui->customFee               ->setEnabled(ui->radioCustomFee->isChecked() && !ui->checkBoxMinimumFee->isChecked());
 }
 
@@ -600,7 +600,10 @@ void SendCoinsDialog::updateGlobalFeeVariables()
     {
         nTxConfirmTarget = defaultConfirmTarget;
         payTxFee = CFeeRate(ui->customFee->value());
-        fPayAtLeastCustomFee = ui->radioCustomAtLeast->isChecked();
+
+        // if user has selected to set a minimum absolute fee, pass the value to coincontrol
+        // set nMinimumTotalFee to 0 in case of user has selected that the fee is per KB
+        CoinControlDialog::coinControl->nMinimumTotalFee = ui->radioCustomAtLeast->isChecked() ? ui->customFee->value() : 0;
     }
 
     fSendFreeTransactions = ui->checkBoxFreeTx->isChecked();
@@ -707,8 +710,7 @@ void SendCoinsDialog::coinControlFeatureChanged(bool checked)
     if (!checked && model) // coin control features disabled
         CoinControlDialog::coinControl->SetNull();
 
-    if (checked)
-        coinControlUpdateLabels();
+    coinControlUpdateLabels();
 }
 
 // Coin Control: button inputs -> show actual coin control dialog
@@ -782,9 +784,24 @@ void SendCoinsDialog::coinControlChangeEdited(const QString& text)
 // Coin Control: update labels
 void SendCoinsDialog::coinControlUpdateLabels()
 {
-    if (!model || !model->getOptionsModel() || !model->getOptionsModel()->getCoinControlFeatures())
+    if (!model || !model->getOptionsModel())
         return;
 
+    if (model->getOptionsModel()->getCoinControlFeatures())
+    {
+        // enable minium absolute fee UI controls
+        ui->radioCustomAtLeast->setVisible(true);
+
+        // only enable the feature if inputs are selected
+        ui->radioCustomAtLeast->setEnabled(CoinControlDialog::coinControl->HasSelected());
+    }
+    else
+    {
+        // in case coin control is disabled (=default), hide minimum absolute fee UI controls
+        ui->radioCustomAtLeast->setVisible(false);
+        return;
+    }
+
     // set pay amounts
     CoinControlDialog::payAmounts.clear();
     CoinControlDialog::fSubtractFeeFromAmount = false;