fix: Correct configuration loading for unnamed sections (backport #2228)

src/Uno.Extensions.Configuration/ServiceCollectionExtensions.cs

@@ -1,7 +1,4 @@
-using System.Collections.Immutable;
-using System.ComponentModel;
-
-namespace Uno.Extensions.Configuration;
+namespace Uno.Extensions.Configuration;
 
 /// <summary>
 /// Extension methods for <see cref="IServiceCollection"/>.
@@ -27,13 +24,14 @@ public static IServiceCollection ConfigureAsWritable<T>(
 		string? name = "")
 			where T : class, new()
 	{
+		var sectionName = name != typeof(T).Name ? name : default;
 		return services
 			// Note - we've replaced the Configure method call with the three calls subsequent three calls so that
 			// we can use a local copy of ConfigurationBinder that handles ImmutableList
 			//.Configure<T>(section)
 			.AddOptions()
-			.AddSingleton<IOptionsChangeTokenSource<T>>(new ConfigurationChangeTokenSource<T>(name ?? Options.DefaultName, section))
-			.AddSingleton<IConfigureOptions<T>>(new Uno.Extensions.Configuration.Internal.NamedConfigureFromConfigurationOptions<T>(name ?? Options.DefaultName, section, _ => { }))
+			.AddSingleton<IOptionsChangeTokenSource<T>>(new ConfigurationChangeTokenSource<T>(sectionName ?? Options.DefaultName, section))
+			.AddSingleton<IConfigureOptions<T>>(new Uno.Extensions.Configuration.Internal.NamedConfigureFromConfigurationOptions<T>(sectionName ?? Options.DefaultName, section, _ => { }))
 
 			.AddTransient<IWritableOptions<T>>(provider =>
 			{

testing/TestHarness/TestHarness.Shared/Ext/Authentication/Oidc/OidcAuthenticationLoginPage.xaml

@@ -22,6 +22,10 @@
 		<StackPanel Grid.Row="1"
 					HorizontalAlignment="Center"
 					VerticalAlignment="Center">
+			<TextBlock>
+				<Run Text="Providers: "/>
+				<Run Text="{Binding ProviderCount}" AutomationProperties.AutomationId="LoginProviderCountText" />
+			</TextBlock>
 			<Button Content="Login"
 					Click="{x:Bind ViewModel.Login}" />
 		</StackPanel>

testing/TestHarness/TestHarness.Shared/Ext/Authentication/Oidc/OidcAuthenticationLoginViewModel.cs

@@ -2,6 +2,7 @@
 
 internal record class OidcAuthenticationLoginViewModel(INavigator Navigator, IAuthenticationService Authentication, IAuthenticationRouteInfo RouteInfo)
 {
+	public int ProviderCount => Authentication.Providers.Length;
 	public async void Login()
 	{
 		var authenticated = await Authentication.LoginAsync(null);

testing/TestHarness/TestHarness.UITest/Ext/Authentication/Oidc/Given_Oidc.cs

@@ -0,0 +1,17 @@
+namespace TestHarness.UITest;
+
+public class Given_Oidc : NavigationTestBase
+{
+	// [Test]
+	public async Task When_Oidc_Auth()
+	{
+		InitTestSection(TestSections.Authentication_Oidc);
+
+		App.WaitThenTap("ShowAppButton");
+
+		App.WaitElement("LoginNavigationBar");
+		var text = App.GetText("LoginProviderCountText");
+		Assert.AreEqual("4", text);
+	}
+
+}