diff --git a/tools/chatgui/src/message_notification.cpp b/tools/chatgui/src/message_notification.cpp
index 47cb912f..fb198b00 100644
--- a/tools/chatgui/src/message_notification.cpp
+++ b/tools/chatgui/src/message_notification.cpp
@@ -13,8 +13,8 @@
 #include <QHideEvent>
 #include <QCloseEvent>
 
-MessageNotification::MessageNotification(QWidget* parent)
-    : QWidget(parent, Qt::Tool | Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint | Qt::WindowDoesNotAcceptFocus)
+MessageNotification::MessageNotification()
+    : QWidget(nullptr, Qt::Tool | Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint | Qt::WindowDoesNotAcceptFocus)
     , m_activity(new UserActivityMonitor(this))
 {
     setObjectName("messageNotification");
@@ -67,9 +67,10 @@ MessageNotification::~MessageNotification() {
               qPrintable(m_target), int(isVisible()), int(m_hideTimer.isActive()));
 }
 
-void MessageNotification::showMessage(const QString& target, const QString& sender, const QString& channel, const QRect& trayGeometry) {
+void MessageNotification::showMessage(const QString& target, const QString& sender, const QString& channel,
+                                     const QRect& trayGeometry, QScreen* preferredScreen) {
     QScreen* screen = trayGeometry.isEmpty() ? nullptr : QGuiApplication::screenAt(trayGeometry.center());
-    if (!screen && parentWidget()) screen = parentWidget()->screen();
+    if (!screen) screen = preferredScreen;
     if (!screen) screen = QGuiApplication::primaryScreen();
     if (!screen || screen->availableGeometry().isEmpty()) {
         GUI_ERROR("notification: no available screen target=%s", qPrintable(target));
diff --git a/tools/chatgui/src/message_notification.h b/tools/chatgui/src/message_notification.h
index ed0a8677..4ad98154 100644
--- a/tools/chatgui/src/message_notification.h
+++ b/tools/chatgui/src/message_notification.h
@@ -6,14 +6,16 @@
 #include <QTimer>
 
 class QLabel;
+class QScreen;
 class UserActivityMonitor;
 
 class MessageNotification : public QWidget {
     Q_OBJECT
 public:
-    explicit MessageNotification(QWidget* parent = nullptr);
+    MessageNotification();
     ~MessageNotification() override;
-    void showMessage(const QString& target, const QString& sender, const QString& channel, const QRect& trayGeometry);
+    void showMessage(const QString& target, const QString& sender, const QString& channel,
+                     const QRect& trayGeometry, QScreen* preferredScreen = nullptr);
     void dismiss(const char* reason);
 
 signals:
diff --git a/tools/chatgui/tests/test_message_notification.cpp b/tools/chatgui/tests/test_message_notification.cpp
index 62ced741..279aee88 100644
--- a/tools/chatgui/tests/test_message_notification.cpp
+++ b/tools/chatgui/tests/test_message_notification.cpp
@@ -43,8 +43,9 @@ public slots:
                    requests, (unsigned long long)idle, delayMs, int(calledFromDBus()));
         if (delayMs) {
             const QDBusMessage reply = message().createReply(QVariant::fromValue(idle));
+            const QDBusConnection bus = connection();
             setDelayedReply(true);
-            QTimer::singleShot(delayMs, this, [reply] { QDBusConnection::sessionBus().send(reply); });
+            QTimer::singleShot(delayMs, this, [reply, bus] { bus.send(reply); });
         }
         return idle;
     }
@@ -60,6 +61,13 @@ private slots:
         qunsetenv("XDG_SESSION_TYPE");
     }
 
+    void cleanup() {
+        qunsetenv("XDG_SESSION_TYPE");
+#ifdef UTUN_TEST_ACTIVITY_DBUS
+        QDBusConnection::disconnectFromBus("notification-test-service");
+#endif
+    }
+
     void firstSystemActivityAndCancellation() {
         FakeSystemActivity activity;
         QSignalSpy spy(&activity, &UserActivityMonitor::activity);
@@ -98,11 +106,15 @@ private slots:
         QWidget hiddenParent;
         QLineEdit otherWindow;
         otherWindow.show();
-        QApplication::setActiveWindow(&otherWindow);
-        MessageNotification notification(&hiddenParent);
+        otherWindow.activateWindow();
+        QTRY_COMPARE(QApplication::activeWindow(), &otherWindow);
+        MessageNotification notification;
         notification.showMessage("42", "Alice", "Test channel", {});
         QVERIFY(notification.isVisible());
+        QVERIFY(!notification.parentWidget()); // ОС не должна скрывать уведомление вместе с главным окном.
         QCOMPARE(QApplication::activeWindow(), &otherWindow);
+        hiddenParent.showMinimized();
+        QVERIFY(notification.isVisible());
         QTest::qWait(10200);
         QVERIFY(notification.isVisible()); // Без активности автоматического таймера нет.
         QElapsedTimer elapsed;
@@ -144,7 +156,8 @@ private slots:
 
 #ifdef UTUN_TEST_ACTIVITY_DBUS
     void gnomeIdleAndStaleReplies() {
-        auto bus = QDBusConnection::sessionBus();
+        // Разные соединения исключают прямой вызов внутри Qt, чтобы задержка действительно прошла через D-Bus.
+        auto bus = QDBusConnection::connectToBus(QDBusConnection::SessionBus, "notification-test-service");
         QVERIFY(bus.registerService("org.gnome.Mutter.IdleMonitor"));
         FakeGnomeIdle idle;
         QVERIFY(bus.registerObject("/org/gnome/Mutter/IdleMonitor/Core", &idle, QDBusConnection::ExportAllSlots));