fix: Check if navigating back is possible to update state

(cherry picked from commit 5611dffabc)

src/Uno.Extensions.Hosting.UI/AppHostingEnvironment.cs

@@ -16,15 +16,14 @@ internal class AppHostingEnvironment : HostingEnvironment, IAppHostEnvironment,
 	public Assembly? HostAssembly { get; init; }
 
 #if __WASM__
-	public async Task UpdateAddressBar(Uri applicationUri)
+	public async Task UpdateAddressBar(Uri applicationUri, bool canGoBack)
 	{
 		CoreApplication.MainView?.DispatcherQueue.TryEnqueue(() =>
 					{
 						var state = 1;
 						if (PlatformHelper.IsWebAssembly)
 						{
-							var currentView = SystemNavigationManager.GetForCurrentView();
-							state = currentView?.AppViewBackButtonVisibility == AppViewBackButtonVisibility.Visible ? 1 : 0;
+							state = canGoBack ? 1 : 0;
 						}
 
 						var href = Imports.GetLocation();

src/Uno.Extensions.Hosting/IHasAddressBar.cs

@@ -12,8 +12,11 @@ public interface IHasAddressBar
 	/// <param name="applicationUri">
 	/// The URI to update the address bar with.
 	/// </param>
+	/// <param name="canGoBack">
+	/// Whether it is possible to navigate back or not.
+	/// </param>
 	/// <returns>
 	/// A task that completes when the address bar has been updated.
 	/// </returns>
-	Task UpdateAddressBar(Uri applicationUri);
+	Task UpdateAddressBar(Uri applicationUri, bool canGoBack);
 }

src/Uno.Extensions.Navigation.UI/BrowserAddressBarService.cs

@@ -72,12 +72,14 @@ internal class BrowserAddressBarService : IHostedService
 				return;
 			}
 
+			var canGoBack = rootRegion.Navigator() is { } navigator && await navigator.CanGoBack();
+
 			var url = new UriBuilder
 			{
 				Query = route.Query(),
 				Path = route.FullPath()?.Replace("+", "/")
 			};
-			await _addressbarHost!.UpdateAddressBar(url.Uri);
+			await _addressbarHost!.UpdateAddressBar(url.Uri, canGoBack);
 		}
 		catch (Exception ex)
 		{