dotnet
Remove calls to scoped services on root provider
Description of Change
Alternative approach for https://github.com/dotnet/maui/pull/18492.
This approach opts for changing current behavior as little as possible for NET8. Instead of changing the behavior of IMauiInitializeScopedService this just stops using it. AFAICT it's not really providing any current value for us. We can just use IMauiInitializeService to achieve the same workaround for WinUI.
The main behavior change here is how to handle the first call to IDispatcher from the service provider scoped to the window.
Behavior Change
Currently in MAUI if you try to retrieve the Dispatcher from the scoped service provider on a background thread it just returns null, but this captures the dispatcher when the window scope is created. Which is probably a better experience.
https://github.com/dotnet/maui/pull/19593/files#diff-500f3422fdff10304272c2e7985ec98941543f788bef70ac1fb1b23776bb1104R49-R55
Added issue here to evaluate the correctness of IMauiInitializeScopedService because this interface currently only initializes once at the application level, it doesn't actually initialize for each scoped service we create.
Issues Fixed
Fixes #11457
