Remove custom fee radio group

Removes the extraneous custom fee radio group and its single radio
button. The radio button is replaced with a label that has the
radio button's text.

src/qt/forms/sendcoinsdialog.ui

@@ -846,19 +846,13 @@
                <item>
                 <layout class="QHBoxLayout" name="horizontalLayoutFee13">
                  <item>
-                  <widget class="QRadioButton" name="radioCustomPerKilobyte">
+                  <widget class="QLabel" name="labelCustomPerKilobyte">
                    <property name="toolTip">
                     <string>If the custom fee is set to 1000 satoshis and the transaction is only 250 bytes, then &quot;per kilobyte&quot; only pays 250 satoshis in fee, while &quot;total at least&quot; pays 1000 satoshis. For transactions bigger than a kilobyte both pay by kilobyte.</string>
                    </property>
                    <property name="text">
                     <string>per kilobyte</string>
                    </property>
-                   <property name="checked">
-                    <bool>true</bool>
-                   </property>
-                   <attribute name="buttonGroup">
-                    <string notr="true">groupCustomFee</string>
-                   </attribute>
                   </widget>
                  </item>
                  <item>
@@ -1285,6 +1279,5 @@
  <connections/>
  <buttongroups>
   <buttongroup name="groupFee"/>
-  <buttongroup name="groupCustomFee"/>
  </buttongroups>
 </ui>

src/qt/sendcoinsdialog.cpp

@@ -114,10 +114,6 @@ SendCoinsDialog::SendCoinsDialog(const PlatformStyle *_platformStyle, QWidget *p
         settings.setValue("nFeeRadio", 1); // custom
     if (!settings.contains("nFeeRadio"))
         settings.setValue("nFeeRadio", 0); // recommended
-    if (!settings.contains("nCustomFeeRadio") && settings.contains("nTransactionFee") && settings.value("nTransactionFee").toLongLong() > 0) // compatibility
-        settings.setValue("nCustomFeeRadio", 1); // total at least
-    if (!settings.contains("nCustomFeeRadio"))
-        settings.setValue("nCustomFeeRadio", 0); // per kilobyte
     if (!settings.contains("nSmartFeeSliderPosition"))
         settings.setValue("nSmartFeeSliderPosition", 0);
     if (!settings.contains("nTransactionFee"))
@@ -127,8 +123,6 @@ SendCoinsDialog::SendCoinsDialog(const PlatformStyle *_platformStyle, QWidget *p
     ui->groupFee->setId(ui->radioSmartFee, 0);
     ui->groupFee->setId(ui->radioCustomFee, 1);
     ui->groupFee->button((int)std::max(0, std::min(1, settings.value("nFeeRadio").toInt())))->setChecked(true);
-    ui->groupCustomFee->setId(ui->radioCustomPerKilobyte, 0);
-    ui->groupCustomFee->button(0)->setChecked(true);
     ui->customFee->setValue(settings.value("nTransactionFee").toLongLong());
     ui->checkBoxMinimumFee->setChecked(settings.value("fPayOnlyMinFee").toBool());
     minimizeFeeSection(settings.value("fFeeSectionMinimized").toBool());
@@ -178,7 +172,6 @@ void SendCoinsDialog::setModel(WalletModel *_model)
         connect(ui->confTargetSelector, SIGNAL(currentIndexChanged(int)), this, SLOT(coinControlUpdateLabels()));
         connect(ui->groupFee, SIGNAL(buttonClicked(int)), this, SLOT(updateFeeSectionControls()));
         connect(ui->groupFee, SIGNAL(buttonClicked(int)), this, SLOT(coinControlUpdateLabels()));
-        connect(ui->groupCustomFee, SIGNAL(buttonClicked(int)), this, SLOT(coinControlUpdateLabels()));
         connect(ui->customFee, SIGNAL(valueChanged()), this, SLOT(coinControlUpdateLabels()));
         connect(ui->checkBoxMinimumFee, SIGNAL(stateChanged(int)), this, SLOT(setMinimumFee()));
         connect(ui->checkBoxMinimumFee, SIGNAL(stateChanged(int)), this, SLOT(updateFeeSectionControls()));
@@ -214,7 +207,6 @@ SendCoinsDialog::~SendCoinsDialog()
     QSettings settings;
     settings.setValue("fFeeSectionMinimized", fFeeMinimized);
     settings.setValue("nFeeRadio", ui->groupFee->checkedId());
-    settings.setValue("nCustomFeeRadio", ui->groupCustomFee->checkedId());
     settings.setValue("nConfTarget", getConfTargetForIndex(ui->confTargetSelector->currentIndex()));
     settings.setValue("nTransactionFee", (qint64)ui->customFee->value());
     settings.setValue("fPayOnlyMinFee", ui->checkBoxMinimumFee->isChecked());
@@ -609,7 +601,6 @@ void SendCoinsDialog::on_buttonMinimizeFee_clicked()
 
 void SendCoinsDialog::setMinimumFee()
 {
-    ui->radioCustomPerKilobyte->setChecked(true);
     ui->customFee->setValue(GetRequiredFee(1000));
 }
 
@@ -622,7 +613,7 @@ void SendCoinsDialog::updateFeeSectionControls()
     ui->labelFeeEstimation      ->setEnabled(ui->radioSmartFee->isChecked());
     ui->checkBoxMinimumFee      ->setEnabled(ui->radioCustomFee->isChecked());
     ui->labelMinFeeWarning      ->setEnabled(ui->radioCustomFee->isChecked());
-    ui->radioCustomPerKilobyte  ->setEnabled(ui->radioCustomFee->isChecked() && !ui->checkBoxMinimumFee->isChecked());
+    ui->labelCustomPerKilobyte  ->setEnabled(ui->radioCustomFee->isChecked() && !ui->checkBoxMinimumFee->isChecked());
     ui->customFee               ->setEnabled(ui->radioCustomFee->isChecked() && !ui->checkBoxMinimumFee->isChecked());
 }
 
@@ -634,8 +625,7 @@ void SendCoinsDialog::updateFeeMinimizedLabel()
     if (ui->radioSmartFee->isChecked())
         ui->labelFeeMinimized->setText(ui->labelSmartFee->text());
     else {
-        ui->labelFeeMinimized->setText(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), ui->customFee->value()) +
-            ((ui->radioCustomPerKilobyte->isChecked()) ? "/kB" : ""));
+        ui->labelFeeMinimized->setText(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), ui->customFee->value()) + "/kB");
     }
 }