Use function-pointer based signal-slot connection

src/app/qtlocalpeer/qtlocalpeer.cpp

@@ -152,7 +152,7 @@ bool QtLocalPeer::isClient()
 #endif
     if (!res)
         qWarning("QtSingleCoreApplication: listen on local socket failed, %s", qPrintable(server->errorString()));
-    QObject::connect(server, SIGNAL(newConnection()), SLOT(receiveConnection()));
+    connect(server, &QLocalServer::newConnection, this, &QtLocalPeer::receiveConnection);
     return false;
 }
 

src/gui/advancedsettings.cpp

@@ -715,12 +715,12 @@ void AdvancedSettings::addRow(const int row, const QString &text, T *widget)
     setCellWidget(row, PROPERTY, label);
     setCellWidget(row, VALUE, widget);
 
-    if (std::is_same_v<T, QCheckBox>)
-        connect(widget, SIGNAL(stateChanged(int)), this, SIGNAL(settingsChanged()));
-    else if (std::is_same_v<T, QSpinBox>)
-        connect(widget, SIGNAL(valueChanged(int)), this, SIGNAL(settingsChanged()));
-    else if (std::is_same_v<T, QComboBox>)
-        connect(widget, SIGNAL(currentIndexChanged(int)), this, SIGNAL(settingsChanged()));
-    else if (std::is_same_v<T, QLineEdit>)
-        connect(widget, SIGNAL(textChanged(QString)), this, SIGNAL(settingsChanged()));
+    if constexpr (std::is_same_v<T, QCheckBox>)
+        connect(widget, &QCheckBox::stateChanged, this, &AdvancedSettings::settingsChanged);
+    else if constexpr (std::is_same_v<T, QSpinBox>)
+        connect(widget, qOverload<int>(&QSpinBox::valueChanged), this, &AdvancedSettings::settingsChanged);
+    else if constexpr (std::is_same_v<T, QComboBox>)
+        connect(widget, qOverload<int>(&QComboBox::currentIndexChanged), this, &AdvancedSettings::settingsChanged);
+    else if constexpr (std::is_same_v<T, QLineEdit>)
+        connect(widget, &QLineEdit::textChanged, this, &AdvancedSettings::settingsChanged);
 }