instanceof: return false instead of throwing

[ChangeLog][Important Behavior Changes] Using instanceof to check
whether an instance has the type of QObject or one of its derived
classes used to raise a TypeError, if the instance was not derived from
QObject. Now, it instead returns false, which is more in line with the
ECMAScript semantic.

Fixes: QTBUG-79868
Change-Id: I0999807165eb36e7ebb888dce66238619a02a127
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/qml/qml/qqmltypewrapper.cpp b/src/qml/qml/qqmltypewrapper.cpp
index ef4a628a04..fa5d36503d 100644
--- a/src/qml/qml/qqmltypewrapper.cpp
+++ b/src/qml/qml/qqmltypewrapper.cpp
@@ -400,7 +400,7 @@ ReturnedValue QQmlTypeWrapper::virtualInstanceOf(const Object *typeObject, const
     // can only compare a QObject* against a QML type
     const QObjectWrapper *wrapper = var.as<QObjectWrapper>();
     if (!wrapper)
-        return engine->throwTypeError();
+        return QV4::Encode(false);
 
     // in case the wrapper outlived the QObject*
     const QObject *wrapperObject = wrapper->object();