UWP Presentation Attributes not working correctly

[strebbin]

Steps to reproduce 📜

1. Use the Playground.Uwp-App and add another Frame to ChildView.xaml before the "NestedFrame"-Frame

2. In the Playground.Uwp-App try to open the SplitView-Page

Expected behavior 🤔

1. The name in the MvxRegionPresentationAttribute should not be ignored so just Views with the correct name are used.

2. The SplitView Demo opens and shows pane and content.

Actual behavior 🐛

1. Always the new Frame is used for the SecondChildView instead of the NestedFrame which should be used.

2. The app crashed with an MvxException saying "Failed to find a SplitView in the visual tree of SplitMasterView"

Configuration 🔧

Version: 5.5

Platform:

• 📱 iOS
• 🤖 Android
• 🏁 WPF
• 🌎 UWP
• 🍎 MacOS
• 📺 tvOS
• 🐒 Xamarin.Forms