Crash when refreshing a ListView.view.property with C++ model and delegate created with Loader

When you load a delegate through a Loader element, the elements are not destroyed when the C++ context property is refreshed.

So, asking next of a refresh of a ListView property will make crash the application when accessing to the "model.modelData" property.

The project is dynamiclist.tar.gz and backtrace is located in qt4.8.0_backtrace.txt. It is only necessary to click on the button "remove all items" to see the application crash.

Qt 5.0.0 Alpha is more robust but I made it crash with a more complex project. See qt5_backtrace.txt