QML: Consider deep aliases when finding binding targets

If we have a deep alias we need to bind to the inner object rather than
the outer one.

Fixes: QTBUG-109417
Pick-to: 6.5 6.2
Change-Id: Iefe8641026cfbbf9199b2bb8d9fa2f5fba591f17
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
index 948b3b1bc3..efe89f61ac 100644
--- a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
+++ b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
@@ -2286,6 +2286,16 @@ void tst_qqmllanguage::aliasProperties()
         QQmlComponent component(&engine, testFileUrl("alias.18.qml"));
         VERIFY_ERRORS("alias.18.errors.txt");
     }
+
+    // Binding on deep alias
+    {
+        QQmlComponent component(&engine, testFileUrl("alias.19.qml"));
+        VERIFY_ERRORS(0);
+
+        QScopedPointer<QObject> object(component.create());
+        QVERIFY(!object.isNull());
+        QCOMPARE(object->property("height").toInt(), 960);
+    }
 }
 
 // QTBUG-13374 Test that alias properties and signals can coexist