qt: Add option to (not) spend unconfirmed change

- Add a wallet tab to options dialog
- Move fee setting to wallet tab
- Add new setting to set -nospendzeroconfchange from UI

4 files changed, 101 insertions, 47 deletions

diff --git a/src/qt/forms/optionsdialog.ui b/src/qt/forms/optionsdialog.ui
index e0d99aac39..b4a9f1f580 100644
--- a/src/qt/forms/optionsdialog.ui
+++ b/src/qt/forms/optionsdialog.ui
@@ -28,52 +28,6 @@
       </attribute>
       <layout class="QVBoxLayout" name="verticalLayout_Main">
        <item>
-        <widget class="QLabel" name="transactionFeeInfoLabel">
-         <property name="text">
-          <string>Optional transaction fee per kB that helps make sure your transactions are processed quickly. Most transactions are 1 kB.</string>
-         </property>
-         <property name="textFormat">
-          <enum>Qt::PlainText</enum>
-         </property>
-         <property name="wordWrap">
-          <bool>true</bool>
-         </property>
-        </widget>
-       </item>
-       <item>
-        <layout class="QHBoxLayout" name="horizontalLayout_1_Main">
-         <item>
-          <widget class="QLabel" name="transactionFeeLabel">
-           <property name="text">
-            <string>Pay transaction &amp;fee</string>
-           </property>
-           <property name="textFormat">
-            <enum>Qt::PlainText</enum>
-           </property>
-           <property name="buddy">
-            <cstring>transactionFee</cstring>
-           </property>
-          </widget>
-         </item>
-         <item>
-          <widget class="BitcoinAmountField" name="transactionFee"/>
-         </item>
-         <item>
-          <spacer name="horizontalSpacer_1_Main">
-           <property name="orientation">
-            <enum>Qt::Horizontal</enum>
-           </property>
-           <property name="sizeHint" stdset="0">
-            <size>
-             <width>40</width>
-             <height>20</height>
-            </size>
-           </property>
-          </spacer>
-         </item>
-        </layout>
-       </item>
-       <item>
         <widget class="QCheckBox" name="bitcoinAtStartup">
          <property name="toolTip">
           <string>Automatically start Bitcoin after logging in to the system.</string>
@@ -194,6 +148,89 @@
        </item>
       </layout>
      </widget>
+     <widget class="QWidget" name="tabWallet">
+      <attribute name="title">
+       <string>W&amp;allet</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout_Network">
+       <item>
+        <widget class="QLabel" name="transactionFeeInfoLabel">
+         <property name="text">
+          <string>Optional transaction fee per kB that helps make sure your transactions are processed quickly. Most transactions are 1 kB.</string>
+         </property>
+         <property name="textFormat">
+          <enum>Qt::PlainText</enum>
+         </property>
+         <property name="wordWrap">
+          <bool>true</bool>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <layout class="QHBoxLayout" name="horizontalLayout_1_Main">
+         <item>
+          <widget class="QLabel" name="transactionFeeLabel">
+           <property name="text">
+            <string>Pay transaction &amp;fee</string>
+           </property>
+           <property name="textFormat">
+            <enum>Qt::PlainText</enum>
+           </property>
+           <property name="buddy">
+            <cstring>transactionFee</cstring>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="BitcoinAmountField" name="transactionFee"/>
+         </item>
+         <item>
+          <spacer name="horizontalSpacer_1_Main">
+           <property name="orientation">
+            <enum>Qt::Horizontal</enum>
+           </property>
+           <property name="sizeHint" stdset="0">
+            <size>
+             <width>40</width>
+             <height>20</height>
+            </size>
+           </property>
+          </spacer>
+         </item>
+        </layout>
+       </item>
+       <item>
+        <widget class="QLabel" name="label">
+         <property name="text">
+          <string>If you disable the spending of unconfirmed change, the change from a transaction cannot be used until that transaction has at least one confirmation. This also affects how your balance is computed.</string>
+         </property>
+         <property name="wordWrap">
+          <bool>true</bool>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QCheckBox" name="spendZeroConfChange">
+         <property name="text">
+          <string>Spend unconfirmed change  (experts only)</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <spacer name="verticalSpacer">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+      </layout>
+     </widget>
      <widget class="QWidget" name="tabNetwork">
       <attribute name="title">
        <string>&amp;Network</string>
diff --git a/src/qt/optionsdialog.cpp b/src/qt/optionsdialog.cpp
index f61bb3ed2c..317e1db7d3 100644
--- a/src/qt/optionsdialog.cpp
+++ b/src/qt/optionsdialog.cpp
@@ -148,11 +148,14 @@ void OptionsDialog::setModel(OptionsModel *model)
 void OptionsDialog::setMapper()
 {
     /* Main */
-    mapper->addMapping(ui->transactionFee, OptionsModel::Fee);
     mapper->addMapping(ui->bitcoinAtStartup, OptionsModel::StartAtStartup);
     mapper->addMapping(ui->threadsScriptVerif, OptionsModel::ThreadsScriptVerif);
     mapper->addMapping(ui->databaseCache, OptionsModel::DatabaseCache);
 
+    /* Wallet */
+    mapper->addMapping(ui->transactionFee, OptionsModel::Fee);
+    mapper->addMapping(ui->spendZeroConfChange, OptionsModel::SpendZeroConfChange);
+
     /* Network */
     mapper->addMapping(ui->mapPortUpnp, OptionsModel::MapPortUPnP);
 
diff --git a/src/qt/optionsmodel.cpp b/src/qt/optionsmodel.cpp
index a2a2732b1c..f8354ef557 100644
--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -76,6 +76,11 @@ void OptionsModel::Init()
     nTransactionFee = settings.value("nTransactionFee").toLongLong(); // if -paytxfee is set, this will be overridden later in init.cpp
     if (mapArgs.count("-paytxfee"))
         strOverriddenByCommandLine += "-paytxfee ";
+
+    if (!settings.contains("bSpendZeroConfChange"))
+        settings.setValue("bSpendZeroConfChange", true);
+    if (!SoftSetBoolArg("-spendzeroconfchange", settings.value("bSpendZeroConfChange").toBool()))
+        strOverriddenByCommandLine += "-spendzeroconfchange ";
 #endif
 
     if (!settings.contains("nDatabaseCache"))
@@ -184,6 +189,8 @@ QVariant OptionsModel::data(const QModelIndex & index, int role) const
             // Todo: Consider to revert back to use just nTransactionFee here, if we don't want
             // -paytxfee to update our QSettings!
             return settings.value("nTransactionFee");
+        case SpendZeroConfChange:
+            return settings.value("bSpendZeroConfChange");
 #endif
         case DisplayUnit:
             return nDisplayUnit;
@@ -274,6 +281,12 @@ bool OptionsModel::setData(const QModelIndex & index, const QVariant & value, in
             settings.setValue("nTransactionFee", (qint64)nTransactionFee);
             emit transactionFeeChanged(nTransactionFee);
             break;
+        case SpendZeroConfChange:
+            if (settings.value("bSpendZeroConfChange") != value) {
+                settings.setValue("bSpendZeroConfChange", value);
+                setRestartRequired(true);
+            }
+            break;
 #endif
         case DisplayUnit:
             nDisplayUnit = value.toInt();
diff --git a/src/qt/optionsmodel.h b/src/qt/optionsmodel.h
index e5c1e3e8b9..a3487ddd2e 100644
--- a/src/qt/optionsmodel.h
+++ b/src/qt/optionsmodel.h
@@ -40,6 +40,7 @@ public:
         CoinControlFeatures,    // bool
         ThreadsScriptVerif,     // int
         DatabaseCache,          // int
+        SpendZeroConfChange,    // bool
         OptionIDRowCount,
     };