Allow setting values in value type group properties in "on" assignments

Assigning to a group property inside a property value source or
interceptor as part of an "on assignment" is perfectly valid. That is
because while "color" is a value type property, the on assignment means
we're actually setting easing.type (in the example and test) on the
property value source, not the color, and that one is a QObject. The
same goes for interceptors.

 Conflicts:
	src/qml/compiler/qqmlpropertyvalidator.cpp
	src/qml/qml/qqmlvmemetaobject_p.h
	tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp

Change-Id: I505a658977a578894d6dfb00bf5c65b41e42b12f
Task-number: QTBUG-56600
Reviewed-by: Michael Brasser <michael.brasser@live.com>
(cherry picked from commit 2659c308792967322564b5088e0e21bb371e0283)

3 files changed, 33 insertions, 1 deletions

diff --git a/src/qml/compiler/qqmltypecompiler.cpp b/src/qml/compiler/qqmltypecompiler.cpp
index 82332dfc35..5a42fc15a6 100644
--- a/src/qml/compiler/qqmltypecompiler.cpp
+++ b/src/qml/compiler/qqmltypecompiler.cpp
@@ -1914,7 +1914,11 @@ bool QQmlPropertyValidator::validateObject(int objectIndex, const QV4::CompiledD
 
         if (binding->type >= QV4::CompiledData::Binding::Type_Object && (pd || binding->isAttachedProperty())) {
             qSwap(_seenObjectWithId, seenSubObjectWithId);
-            const bool subObjectValid = validateObject(binding->value.objectIndex, binding, pd && QQmlValueTypeFactory::metaObjectForMetaType(pd->propType));
+            const bool populatingValueTypeGroupProperty
+                    = pd
+                      && QQmlValueTypeFactory::metaObjectForMetaType(pd->propType)
+                      && !(binding->flags & QV4::CompiledData::Binding::IsOnAssignment);
+            const bool subObjectValid = validateObject(binding->value.objectIndex, binding, populatingValueTypeGroupProperty);
             qSwap(_seenObjectWithId, seenSubObjectWithId);
             if (!subObjectValid)
                 return false;
diff --git a/tests/auto/qml/qqmllanguage/data/groupPropertyInPropertyValueSource.qml b/tests/auto/qml/qqmllanguage/data/groupPropertyInPropertyValueSource.qml
new file mode 100644
index 0000000000..579086fa1c
--- /dev/null
+++ b/tests/auto/qml/qqmllanguage/data/groupPropertyInPropertyValueSource.qml
@@ -0,0 +1,11 @@
+import QtQuick 2.0
+
+Rectangle {
+    ColorAnimation on color {
+        id: animation
+        from: "red"
+        to: "darkgray"
+        duration: 250
+        easing.type: Easing.InOutQuad
+    }
+}
diff --git a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
index 2a519d55f0..5f6185ad01 100644
--- a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
+++ b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
@@ -43,6 +43,7 @@
 #include <QFont>
 #include <QQmlFileSelector>
 #include <QFileSelector>
+#include <QEasingCurve>
 
 #include <private/qqmlproperty_p.h>
 #include <private/qqmlmetatype_p.h>
@@ -255,6 +256,8 @@ private slots:
 
     void deleteSingletons();
 
+    void valueTypeGroupPropertiesInBehavior();
+
 private:
     QQmlEngine engine;
     QStringList defaultImportPathList;
@@ -4154,6 +4157,20 @@ void tst_qqmllanguage::deleteSingletons()
     QVERIFY(singleton.data() == 0);
 }
 
+void tst_qqmllanguage::valueTypeGroupPropertiesInBehavior()
+{
+    QQmlEngine engine;
+    QQmlComponent component(&engine, testFileUrl("groupPropertyInPropertyValueSource.qml"));
+    VERIFY_ERRORS(0);
+    QScopedPointer<QObject> o(component.create());
+    QVERIFY(!o.isNull());
+
+    QObject *animation = qmlContext(o.data())->contextProperty("animation").value<QObject*>();
+    QVERIFY(animation);
+
+    QCOMPARE(animation->property("easing").value<QEasingCurve>().type(), QEasingCurve::InOutQuad);
+}
+
 QTEST_MAIN(tst_qqmllanguage)
 
 #include "tst_qqmllanguage.moc"