Make QML composite types inherit attached properties

Change-Id: Ic06af4805da987dd08e361f2668e7a1788d3eefe
Task-number: QTBUG-43581
Reviewed-by: Mitch Curtis <mitch.curtis@theqtcompany.com>
Reviewed-by: Liang Qi <liang.qi@theqtcompany.com>
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/src/qml/qml/qqmlobjectcreator.cpp b/src/qml/qml/qqmlobjectcreator.cpp
index 58c0b49b3c..c03a463c83 100644
--- a/src/qml/qml/qqmlobjectcreator.cpp
+++ b/src/qml/qml/qqmlobjectcreator.cpp
@@ -706,7 +706,12 @@ bool QQmlObjectCreator::setPropertyBinding(const QQmlPropertyData *property, con
         QQmlCompiledData::TypeReference *tr = resolvedTypes.value(binding->propertyNameIndex);
         Q_ASSERT(tr);
         QQmlType *attachedType = tr->type;
-        const int id = attachedType->attachedPropertiesId();
+        if (!attachedType) {
+            QQmlTypeNameCache::Result res = context->imports->query(stringAt(binding->propertyNameIndex));
+            if (res.isValid())
+                attachedType = res.type;
+        }
+        const int id = attachedType->attachedPropertiesId(QQmlEnginePrivate::get(engine));
         QObject *qmlObject = qmlAttachedPropertiesObjectById(id, _qobject);
         if (!populateInstance(binding->value.objectIndex, qmlObject, qmlObject, /*value type property*/0))
             return false;