Fix regression with nested objects served by custom parsers

The following piece of code used to work and broke with Qt 5.3:

ListModel {
    property var conn: Connection {
        ...
    }
}

When validating the properties of the ListModel we would not validate
the Connection sub-object here, which meant the custom parser for the
connection object was never called.

We need to extend the logic for sub-object validation to recursive into
sub-objects when this is either an attached property (Component.onComplete on a
list model for example) or the object is assigned to an _existing_ property,
i.e. a property not deal with by the custom parser. In this case that's a
custom declared property.

Change-Id: Ic99f746f08771460cc6424a9e8a839c78a7eafd9
Task-number: QTBUG-45735
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmllanguage/data/nestedCustomParsers.qml b/tests/auto/qml/qqmllanguage/data/nestedCustomParsers.qml
new file mode 100644
index 0000000000..77b93e8594
--- /dev/null
+++ b/tests/auto/qml/qqmllanguage/data/nestedCustomParsers.qml
@@ -0,0 +1,8 @@
+import Test 1.0
+import QtQml 2.0
+SimpleObjectWithCustomParser {
+    customProperty: 42
+    property var nested: SimpleObjectWithCustomParser {
+        customNestedProperty: 42
+    }
+}