fix: Prevent FrameView DataContext propagation

src/Uno.Extensions.Navigation.UI/Controls/FrameView.xaml.cs

@@ -12,6 +12,9 @@ public sealed partial class FrameView : UserControl
 	public FrameView()
 	{
 		InitializeComponent();
+
+		// Prevent inheritance of DataContext from Parent to avoid propagation to Children
+		DataContext = null;
 	}
 
 	/// <summary>

testing/TestHarness/TestHarness.UITest/Ext/Navigation/PageNavigation/Given_PageNavigation.cs

@@ -168,6 +168,19 @@ public void When_PageNavigationRegisteredRoot()
 
 	}
 
+	[Test]
+	public void When_PageNavigationDataContextDidntChange()
+	{
+		InitTestSection(TestSections.Navigation_PageNavigation);
+
+		App.WaitThenTap("ShowOnePageButton");
+		App.WaitThenTap("OnePageGetUrlFromBrowser");
+
+		// If DataContext is ever changed to anything other than the expected
+		// the text will be "DataContext is not correct"
+		App.WaitForText("OnePageTxtDataContext", "DataContext is ok");
+	}
+
 	private void OnePageToFivePage()
 	{
 		App.WaitThenTap("OnePageToTwoPageButton");

testing/TestHarness/TestHarness/Ext/Navigation/PageNavigation/PageNavigationOnePage.xaml

@@ -36,6 +36,9 @@
 					Click="{x:Bind ViewModel.SettingsWriteTest}"
 					Content="Settings Write Test" />
 			<TextBlock x:Name="TxtUrl" AutomationProperties.AutomationId="OnePageTxtUrlFromBrowser" />
+			<TextBlock x:Name="TxtDataContext"
+					   Text="DataContext is ok"
+					   AutomationProperties.AutomationId="OnePageTxtDataContext" />
 			<Button AutomationProperties.AutomationId="OnePageGetUrlFromBrowser"
 					Click="GetUrlFromBrowser"
 					Content="Get URL" />

testing/TestHarness/TestHarness/Ext/Navigation/PageNavigation/PageNavigationOnePage.xaml.cs

@@ -4,17 +4,32 @@ namespace TestHarness.Ext.Navigation.PageNavigation;
 public sealed partial class PageNavigationOnePage : Page
 {
 	public PageNavigationOneViewModel? ViewModel => DataContext as PageNavigationOneViewModel;
+
+	private Type expectedDataContext = typeof(PageNavigationOneViewModel);
+
 	public PageNavigationOnePage()
 	{
 		this.InitializeComponent();
+
+		this.DataContextChanged += PageNavigationOnePage_DataContextChanged;
+	}
+
+	private void PageNavigationOnePage_DataContextChanged(FrameworkElement sender, DataContextChangedEventArgs args)
+	{
+		// For the test `When_PageNavigationDataContextDidntChange`
+		// If DataContext is ever changed to anything other than the expected the text will be "DataContext is not correct"
+		// So that we can validade on the test
+		if (sender.DataContext is { } dataContext && dataContext.GetType() != expectedDataContext)
+		{
+			TxtDataContext.Text = "DataContext is not correct";
+		}
 	}
 
 	public async void OnePageToTwoPageCodebehindClick(object sender, RoutedEventArgs e)
 	{
 		await this.Navigator()!.NavigateViewAsync<PageNavigationTwoPage>(this);
 	}
 
-
 	public async void GetUrlFromBrowser(object sender, RoutedEventArgs e)
 	{
 #if __WASM__