IServiceScope should get disposed when the associated window is destroyed or closed

[PureWeen]

Currently we are creating ServiceScopes that have a life time attached to the platform windowbut we never actually dispose of the scopes.

This would be very useful behavior to have for services that are created with a service scoped life time.

Implementation of this might surface some problematic scenarios for users if they are using Service Locator pattern with long lived types. For example, a lot of users are still using App.MainPage = new MainPage(). In this scenario (and others) the xplat window/mainpage will survive the life of the platform window. This means if the user has stored the IServiceProvider locally that IServiceProvider will no longer be valid.

We've moved this issue to the Backlog milestone. This means that it is not going to be worked on for the coming release. We will reassess the backlog following the current release and consider this item at that time. To learn more about our issue management process and to have better expectation regarding different types of issues you can read our Triage Process.