Avoid misleading bindingStatus

Set it to nullptr on clear, and deal with possibly null bindingStatus.

Task-number: QTBUG-101177
Task-number: QTBUG-102403
Pick-to: 6.4
Change-Id: I66cb4d505a4f7b377dc90b45ac13834fca19d399
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

1 files changed, 37 insertions, 1 deletions

diff --git a/tests/auto/corelib/kernel/qproperty/tst_qproperty.cpp b/tests/auto/corelib/kernel/qproperty/tst_qproperty.cpp
index 92de7725e4..c0471890ee 100644
--- a/tests/auto/corelib/kernel/qproperty/tst_qproperty.cpp
+++ b/tests/auto/corelib/kernel/qproperty/tst_qproperty.cpp
@@ -79,6 +79,7 @@ private slots:
 
     void noFakeDependencies();
     void threadSafety();
+    void threadSafety2();
 
     void bindablePropertyWithInitialization();
     void noDoubleNotification();
@@ -1694,7 +1695,7 @@ void tst_QProperty::threadSafety()
     auto child1 = new ThreadSafetyTester(obj1);
     obj1->moveToThread(&workerThread);
     const auto mainThreadBindingStatus = QtPrivate::getBindingStatus({});
-    QCOMPARE(qGetBindingStorage(child1)->status({}), mainThreadBindingStatus);
+    QCOMPARE(qGetBindingStorage(child1)->status({}), nullptr);
     workerThread.start();
 
     bool correctStatus = false;
@@ -1743,6 +1744,41 @@ void tst_QProperty::threadSafety()
     QCOMPARE(obj3->objectName(), "moved again");
 }
 
+class QPropertyUsingThread : public QThread
+{
+public:
+    QPropertyUsingThread(QObject **dest, QThread *destThread) : dest(dest), destThread(destThread) {}
+    void run() override
+    {
+        scopedObj1.reset(new ThreadSafetyTester());
+        scopedObj1->setObjectName("test");
+        QObject *child = new ThreadSafetyTester(scopedObj1.get());
+        child->setObjectName("child");
+        exec();
+        scopedObj1->moveToThread(destThread);
+        *dest = scopedObj1.release();
+    }
+    std::unique_ptr<ThreadSafetyTester> scopedObj1;
+    QObject **dest;
+    QThread *destThread;
+};
+
+void tst_QProperty::threadSafety2()
+{
+    std::unique_ptr<QObject> movedObj;
+    {
+        QObject *tmp = nullptr;
+        QPropertyUsingThread workerThread(&tmp, QThread::currentThread());
+        workerThread.start();
+        workerThread.quit();
+        workerThread.wait();
+        movedObj.reset(tmp);
+    }
+
+    QCOMPARE(movedObj->objectName(), "test");
+    QCOMPARE(movedObj->children().first()->objectName(), "child");
+}
+
 struct CustomType
 {
     CustomType() = default;