Photo Surface example on a touch device does not display focus correctly

In the Photo Surface demo (http://doc-snapshot.qt-project.org/qt5-release/qtquick-demos-photosurface-example.html), the photo frame turns red when you select it and black again when you select another frame. However, when you run the demo on an Android touch device (Samsung Galaxy III), the frame does not turn black when you select another frame but only after you complete a pinch gesture on the frame. This makes it difficult to tell which frame has the focus. However, I'm not sure that it is important to show focus in this example, because users can always tap on any image to select it and to then apply gestures on it.