QML: Fix proxy iteration

If the target of a proxy was extensible, we did not set the
iteratorTarget to its correct value, and thus the ForInIteratorObject
would not be usable.

Fixes: QTBUG-86323
Change-Id: Id1924ac4087bab38c006b8eba92b619b79d36b7a
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
(cherry picked from commit dd740d6b3469448dc1fd31c1742781e923e9f274)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmlecmascript/tst_qqmlecmascript.cpp b/tests/auto/qml/qqmlecmascript/tst_qqmlecmascript.cpp
index 31611f2f27..73c2267dca 100644
--- a/tests/auto/qml/qqmlecmascript/tst_qqmlecmascript.cpp
+++ b/tests/auto/qml/qqmlecmascript/tst_qqmlecmascript.cpp
@@ -393,6 +393,7 @@ private slots:
     void urlSearchParamsMethods();
     void variantConversionMethod();
     void sequenceConversionMethod();
+    void proxyIteration();
     void proxyHandlerTraps();
     void gcCrashRegressionTest();
 
@@ -9525,6 +9526,15 @@ void tst_qqmlecmascript::sequenceConversionMethod()
     QCOMPARE(obj.funcCalled, QLatin1String("stringlist"));
 }
 
+void tst_qqmlecmascript::proxyIteration()
+{
+    QQmlEngine engine;
+    QQmlComponent component(&engine, testFileUrl("proxyIteration.qml"));
+    QScopedPointer<QObject> root(component.create());
+    QVERIFY2(root != nullptr, qPrintable(component.errorString()));
+    QCOMPARE(root->property("sum").toInt(), 6);
+}
+
 void tst_qqmlecmascript::proxyHandlerTraps()
 {
     const QString expression = QStringLiteral(R"SNIPPET(