Fix crash in Installer Framework when used with Qt 5.6

IFW uses QQmlV4Function in a QJSEngine environment, so there is no QML context.
Up to commit cc98678f404cd49750076795f39b31bfa36c80c3 that would work. Let's
fall back to the root context as scope if we don't have a qml context.

Change-Id: Ib240746a95a0d16d61620f97abc31e4c74f36723
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/tests/auto/qml/qjsengine/tst_qjsengine.cpp b/tests/auto/qml/qjsengine/tst_qjsengine.cpp
index 39bc8b2e5f..35824c6d00 100644
--- a/tests/auto/qml/qjsengine/tst_qjsengine.cpp
+++ b/tests/auto/qml/qjsengine/tst_qjsengine.cpp
@@ -190,6 +190,8 @@ private slots:
 
     void argumentEvaluationOrder();
 
+    void v4FunctionWithoutQML();
+
 signals:
     void testSignal();
 };
@@ -3799,6 +3801,30 @@ void tst_QJSEngine::argumentEvaluationOrder()
 
 }
 
+class TestObject : public QObject
+{
+    Q_OBJECT
+public:
+    TestObject() : called(false) {}
+
+    bool called;
+
+    Q_INVOKABLE void callMe(QQmlV4Function *) {
+        called = true;
+    }
+};
+
+void tst_QJSEngine::v4FunctionWithoutQML()
+{
+    TestObject obj;
+    QJSEngine engine;
+    QJSValue wrapper = engine.newQObject(&obj);
+    QQmlEngine::setObjectOwnership(&obj, QQmlEngine::CppOwnership);
+    QVERIFY(!obj.called);
+    wrapper.property("callMe").call();
+    QVERIFY(obj.called);
+}
+
 QTEST_MAIN(tst_QJSEngine)
 
 #include "tst_qjsengine.moc"