gui: add taproot checkbox

Author: Sjors

src/qt/forms/receivecoinsdialog.ui

@@ -219,6 +219,31 @@
             </property>
            </widget>
           </item>
+          <item>
+           <widget class="QCheckBox" name="useTaproot">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="maximumSize">
+             <size>
+              <width>1000</width>
+              <height>16777215</height>
+             </size>
+            </property>
+            <property name="focusPolicy">
+             <enum>Qt::StrongFocus</enum>
+            </property>
+            <property name="toolTip">
+             <string>Although the addresses (Bech32m or BIP-350) in Taproot look very similiar to Bech32 addresses, some wallets are not yet able to send to them.</string>
+            </property>
+            <property name="text">
+             <string>Use Taproot</string>
+            </property>
+           </widget>
+          </item>
           <item>
            <spacer name="horizontalSpacer_3">
             <property name="orientation">

src/qt/receivecoinsdialog.cpp

@@ -87,12 +87,23 @@ void ReceiveCoinsDialog::setModel(WalletModel *_model)
             &QItemSelectionModel::selectionChanged, this,
             &ReceiveCoinsDialog::recentRequestsView_selectionChanged);
 
-        if (model->wallet().getDefaultAddressType() == OutputType::BECH32) {
+        const OutputType address_type = model->wallet().getDefaultAddressType();
+        if (address_type == OutputType::BECH32 || address_type == OutputType::BECH32M) {
             ui->useBech32->setCheckState(Qt::Checked);
         } else {
             ui->useBech32->setCheckState(Qt::Unchecked);
         }
 
+        ui->useTaproot->setVisible(model->wallet().taprootEnabled());
+
+        // Enable/disable Taproot checkbox depending on bech32 choice
+        connect(ui->useBech32, &QCheckBox::toggled, [this](bool checked) {
+            ui->useTaproot->setEnabled(checked);
+            if (!checked) {
+                ui->useTaproot->setChecked(false);
+            }
+        });
+
         // Set the button to be enabled or disabled based on whether the wallet can give out new addresses.
         ui->receiveButton->setEnabled(model->wallet().canGetAddresses());
 
@@ -146,10 +157,10 @@ void ReceiveCoinsDialog::on_receiveButton_clicked()
     /* Generate new receiving address */
     OutputType address_type;
     if (ui->useBech32->isChecked()) {
-        address_type = OutputType::BECH32;
+        address_type = ui->useTaproot->isChecked() ? OutputType::BECH32M : OutputType::BECH32;
     } else {
         address_type = model->wallet().getDefaultAddressType();
-        if (address_type == OutputType::BECH32) {
+        if (address_type == OutputType::BECH32 || address_type == OutputType::BECH32M) {
             address_type = OutputType::P2SH_SEGWIT;
         }
     }