GridView::keyNavigationWraps does not work in nested GridView

When the keyNavigationWraps property is set to "true" in a nested GridView and the number of items in the model is so small that no more than a raw is filled, pressing the up / down arrows causes the navigation wrapping to be broken.

I'm attaching a small test case: if you uncomment the last four elements in the model, then everything works perfectly, and the navigation is confined into the above GridView. However, if you run the example with those lines commented (and therefore, the model elements fit in one row) and press the up / down keys, you'll see the the wrapping does not occur and the focus passes to the GridView below.