gui: Add monospaced font settings

src/qt/forms/optionsdialog.ui

@@ -705,6 +705,106 @@
          </item>
         </layout>
        </item>
+       <item>
+        <widget class="QGroupBox" name="font_groupBox">
+         <property name="title">
+          <string>Monospaced font in the Overview tab:</string>
+         </property>
+         <layout class="QVBoxLayout" name="font_verticalLayout">
+          <item>
+           <layout class="QHBoxLayout" name="embeddedFont_horizontalLayout">
+            <item>
+             <widget class="QRadioButton" name="embeddedFont_radioButton">
+              <property name="text">
+               <string>embedded &quot;%1&quot;</string>
+              </property>
+             </widget>
+            </item>
+            <item>
+             <spacer name="embeddedFont_horizontalSpacer">
+              <property name="orientation">
+               <enum>Qt::Horizontal</enum>
+              </property>
+              <property name="sizeHint" stdset="0">
+               <size>
+                <width>40</width>
+                <height>20</height>
+               </size>
+              </property>
+             </spacer>
+            </item>
+            <item>
+             <layout class="QVBoxLayout" name="embeddedFont_verticalLayout">
+              <item>
+               <widget class="QLabel" name="embeddedFont_label_1">
+                <property name="text">
+                 <string>111.11111111 BTC</string>
+                </property>
+               </widget>
+              </item>
+              <item>
+               <widget class="QLabel" name="embeddedFont_label_9">
+                <property name="text">
+                 <string>909.09090909 BTC</string>
+                </property>
+               </widget>
+              </item>
+             </layout>
+            </item>
+           </layout>
+          </item>
+          <item>
+           <widget class="Line" name="font_line">
+            <property name="orientation">
+             <enum>Qt::Horizontal</enum>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <layout class="QHBoxLayout" name="systemFont_horizontalLayout">
+            <item>
+             <widget class="QRadioButton" name="systemFont_radioButton">
+              <property name="text">
+               <string>closest matching &quot;%1&quot;</string>
+              </property>
+             </widget>
+            </item>
+            <item>
+             <spacer name="systemFont_horizontalSpacer">
+              <property name="orientation">
+               <enum>Qt::Horizontal</enum>
+              </property>
+              <property name="sizeHint" stdset="0">
+               <size>
+                <width>40</width>
+                <height>20</height>
+               </size>
+              </property>
+             </spacer>
+            </item>
+            <item>
+             <layout class="QVBoxLayout" name="systemFont_verticalLayout">
+              <item>
+               <widget class="QLabel" name="systemFont_label_1">
+                <property name="text">
+                 <string>111.11111111 BTC</string>
+                </property>
+               </widget>
+              </item>
+              <item>
+               <widget class="QLabel" name="systemFont_label_9">
+                <property name="text">
+                 <string>909.09090909 BTC</string>
+                </property>
+               </widget>
+              </item>
+             </layout>
+            </item>
+           </layout>
+          </item>
+         </layout>
+        </widget>
+       </item>
        <item>
         <spacer name="verticalSpacer_Display">
          <property name="orientation">

src/qt/optionsdialog.cpp

@@ -144,6 +144,20 @@ OptionsDialog::OptionsDialog(QWidget *parent, bool enableWallet) :
         ui->minimizeToTray->setEnabled(false);
     }
 
+    QFont embedded_font{GUIUtil::fixedPitchFont(true)};
+    ui->embeddedFont_radioButton->setText(ui->embeddedFont_radioButton->text().arg(QFontInfo(embedded_font).family()));
+    embedded_font.setWeight(QFont::Bold);
+    ui->embeddedFont_label_1->setFont(embedded_font);
+    ui->embeddedFont_label_9->setFont(embedded_font);
+
+    QFont system_font{GUIUtil::fixedPitchFont(false)};
+    ui->systemFont_radioButton->setText(ui->systemFont_radioButton->text().arg(QFontInfo(system_font).family()));
+    system_font.setWeight(QFont::Bold);
+    ui->systemFont_label_1->setFont(system_font);
+    ui->systemFont_label_9->setFont(system_font);
+    // Checking the embeddedFont_radioButton automatically unchecks the systemFont_radioButton.
+    ui->systemFont_radioButton->setChecked(true);
+
     GUIUtil::handleCloseWindowShortcut(this);
 }
 
@@ -246,6 +260,7 @@ void OptionsDialog::setMapper()
     mapper->addMapping(ui->lang, OptionsModel::Language);
     mapper->addMapping(ui->unit, OptionsModel::DisplayUnit);
     mapper->addMapping(ui->thirdPartyTxUrls, OptionsModel::ThirdPartyTxUrls);
+    mapper->addMapping(ui->embeddedFont_radioButton, OptionsModel::UseEmbeddedMonospacedFont);
 }
 
 void OptionsDialog::setOkButtonState(bool fState)

src/qt/optionsmodel.cpp

@@ -163,6 +163,12 @@ void OptionsModel::Init(bool resetSettings)
         addOverriddenOption("-lang");
 
     language = settings.value("language").toString();
+
+    if (!settings.contains("UseEmbeddedMonospacedFont")) {
+        settings.setValue("UseEmbeddedMonospacedFont", "true");
+    }
+    m_use_embedded_monospaced_font = settings.value("UseEmbeddedMonospacedFont").toBool();
+    Q_EMIT useEmbeddedMonospacedFontChanged(m_use_embedded_monospaced_font);
 }
 
 /** Helper function to copy contents from one QSettings to another.
@@ -326,6 +332,8 @@ QVariant OptionsModel::data(const QModelIndex & index, int role) const
             return strThirdPartyTxUrls;
         case Language:
             return settings.value("language");
+        case UseEmbeddedMonospacedFont:
+            return m_use_embedded_monospaced_font;
         case CoinControlFeatures:
             return fCoinControlFeatures;
         case Prune:
@@ -453,6 +461,11 @@ bool OptionsModel::setData(const QModelIndex & index, const QVariant & value, in
                 setRestartRequired(true);
             }
             break;
+        case UseEmbeddedMonospacedFont:
+            m_use_embedded_monospaced_font = value.toBool();
+            settings.setValue("UseEmbeddedMonospacedFont", m_use_embedded_monospaced_font);
+            Q_EMIT useEmbeddedMonospacedFontChanged(m_use_embedded_monospaced_font);
+            break;
         case CoinControlFeatures:
             fCoinControlFeatures = value.toBool();
             settings.setValue("fCoinControlFeatures", fCoinControlFeatures);

src/qt/optionsmodel.h

@@ -59,6 +59,7 @@ public:
         DisplayUnit,            // BitcoinUnits::Unit
         ThirdPartyTxUrls,       // QString
         Language,               // QString
+        UseEmbeddedMonospacedFont, // bool
         CoinControlFeatures,    // bool
         ThreadsScriptVerif,     // int
         Prune,                  // bool
@@ -84,6 +85,7 @@ public:
     bool getMinimizeOnClose() const { return fMinimizeOnClose; }
     int getDisplayUnit() const { return nDisplayUnit; }
     QString getThirdPartyTxUrls() const { return strThirdPartyTxUrls; }
+    bool getUseEmbeddedMonospacedFont() const { return m_use_embedded_monospaced_font; }
     bool getCoinControlFeatures() const { return fCoinControlFeatures; }
     const QString& getOverriddenByCommandLine() { return strOverriddenByCommandLine; }
 
@@ -107,6 +109,7 @@ private:
     QString language;
     int nDisplayUnit;
     QString strThirdPartyTxUrls;
+    bool m_use_embedded_monospaced_font;
     bool fCoinControlFeatures;
     /* settings that were overridden by command-line */
     QString strOverriddenByCommandLine;
@@ -120,6 +123,7 @@ Q_SIGNALS:
     void displayUnitChanged(int unit);
     void coinControlFeaturesChanged(bool);
     void showTrayIconChanged(bool);
+    void useEmbeddedMonospacedFontChanged(bool);
 };
 
 #endif // BITCOIN_QT_OPTIONSMODEL_H

src/qt/overviewpage.cpp

@@ -258,7 +258,8 @@ void OverviewPage::setClientModel(ClientModel *model)
         connect(model, &ClientModel::alertsChanged, this, &OverviewPage::updateAlerts);
         updateAlerts(model->getStatusBarWarnings());
 
-        setMonospacedFont(false);
+        connect(model->getOptionsModel(), &OptionsModel::useEmbeddedMonospacedFontChanged, this, &OverviewPage::setMonospacedFont);
+        setMonospacedFont(model->getOptionsModel()->getUseEmbeddedMonospacedFont());
     }
 }