[Enhancement] Invoking OnNavigated for TabBar.RootPage

[MaxFmi]

Summary

The root page gets set by assigning the MainPageProperty (MainPage = rootPage;). Technically speaking this is not a navigation. But the root page also needs to initialise its content.

[jfversluis]

Thanks for this suggestion! As Xamarin.Forms is now in maintenance mode, this will not happen anymore for Xamarin.Forms. We're only adding bugfixes and stability fixes.

If this is still important to you, make sure to check the .NET MAUI repo and see if it's already on the roadmap. If not, feel free to open a discussion to discuss a change first or open an issue with a detailed feature request. Thanks!