Fix don't delete singletons objects owned by C++

Don't delete singletons objects that are created only from C++ and
have explicitSetObjectOwnership flag set, explicitSetObjectOwnership
flag is set only by QQmlEngine::setObjectOwnership.

Task-number: QTBUG-49865
Change-Id: I0ef658c2094e67b5cd9a1585e273144dfcee736a
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
index 1f299c0dbb..71f206ed8f 100644
--- a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
+++ b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
@@ -249,6 +249,8 @@ private slots:
 
     void dataAlignment();
 
+    void deleteSingletons();
+
 private:
     QQmlEngine engine;
     QStringList defaultImportPathList;
@@ -4089,6 +4091,24 @@ void tst_qqmllanguage::dataAlignment()
     QVERIFY(sizeof(QQmlVMEMetaData::MethodData) % sizeof(int) == 0);
 }
 
+void tst_qqmllanguage::deleteSingletons()
+{
+    QPointer<QObject> singleton;
+    {
+        QQmlEngine tmpEngine;
+        QQmlComponent component(&tmpEngine, testFile("singletonTest5.qml"));
+        VERIFY_ERRORS(0);
+        QObject *o = component.create();
+        QVERIFY(o != 0);
+        QObject *s1 = NULL;
+        getSingletonInstance(o, "singletonInstance", &s1);
+        QVERIFY(s1 != 0);
+        singleton = s1;
+        QVERIFY(singleton.data() != 0);
+    }
+    QVERIFY(singleton.data() == 0);
+}
+
 QTEST_MAIN(tst_qqmllanguage)
 
 #include "tst_qqmllanguage.moc"