修改bug133399，单用户电源右键存在切换用户选项

src/UserInterface/RightClickMenu/rightclickmenu.cpp

@@ -101,6 +101,36 @@ void RightClickMenu::removeFromCollectionActionTriggerSlot()
     m_actionNumber = 18;
 }
 
+bool RightClickMenu::hasMultipleUsers()
+{
+    QDBusInterface interface("org.freedesktop.Accounts",
+                             "/org/freedesktop/Accounts",
+                             "org.freedesktop.DBus.Properties",
+                             QDBusConnection::systemBus());
+    if (!interface.isValid()) {
+        qCritical() << QDBusConnection::systemBus().lastError().message();
+        return false;
+    }
+
+    QDBusReply<QVariant> reply = interface.call("Get","org.freedesktop.Accounts","HasMultipleUsers");
+    return reply.value().toBool();
+}
+
+bool RightClickMenu::canSwitch()
+{
+    QDBusInterface interface("org.freedesktop.DisplayManager",
+                             "/org/freedesktop/DisplayManager/Seat0",
+                             "org.freedesktop.DBus.Properties",
+                             QDBusConnection::systemBus());
+    if (!interface.isValid()) {
+        qCritical() << QDBusConnection::systemBus().lastError().message();
+        return false;
+    } else {
+        QDBusReply<QVariant> reply = interface.call("Get","org.freedesktop.DisplayManager.Seat","CanSwitch");
+    return reply.value().toBool();
+    }
+}
+
 void RightClickMenu::fixToTaskbarActionTriggerSlot()
 {
     QDBusInterface iface("com.ukui.panel.desktop",
@@ -265,12 +295,12 @@ int RightClickMenu::showShutdownMenu(const QPoint &pos, const bool &isFullWind)
 {
     m_actionNumber = 0;
     MenuBox m_showShutMenu;
+    QDBusReply<bool> reply;
     connect(&m_showShutMenu, &MenuBox::sendMainWinActiveSignal, this, &RightClickMenu::sendMainWinActiveSignal);
     QDBusInterface iface(DBUS_SESSION_NAME, DBUS_SESSION_PATH,
                          DBUS_SESSION_INTERFACE, QDBusConnection::sessionBus());
-    QDBusReply<bool> reply = iface.call("canSwitch");
 
-    if (reply.isValid() && reply.value() == true) {
+    if (canSwitch() && hasMultipleUsers()) {
         m_showShutMenu.addAction(QIcon(getIconPixmap("stock-people-symbolic", 1)), tr("Switch user"),
                                  this, SLOT(switchUserActionTriggerSlot()));
     }

src/UserInterface/RightClickMenu/rightclickmenu.h

@@ -78,7 +78,6 @@ private:
     int m_actionNumber;
     QProcess *m_cmdProc = nullptr;
     UkuiMenuInterface *m_ukuiMenuInterface = nullptr;
-
     QStringList m_whiteList;
 
 protected:
@@ -92,6 +91,10 @@ protected:
      */
     QPixmap getIconPixmap(QString iconstr, int type);
 
+    bool hasMultipleUsers();
+
+    bool canSwitch();
+
 private Q_SLOTS:
     /**
      * @brief Fixed to all software