fix: Remove unnecessary request segments from parent region in backstack

src/Uno.Extensions.Navigation.UI/Navigators/FrameNavigator.cs

@@ -151,6 +151,12 @@ viewType is null ||
 			RemoveLastFromBackStack();
 		}
 
+		var parentRegion = this.Region.Parent;
+		while (parentRegion is { } &&
+			parentRegion.Name is null)
+		{
+			parentRegion = parentRegion.Parent;
+		}
 
 		for (var i = 0; i < segments.Length - 1; i++)
 		{
@@ -160,6 +166,11 @@ viewType is null ||
 				continue;
 			}
 
+			if (parentRegion?.Name == map.Path)
+			{
+				continue;
+			}
+
 			var newEntry = new PageStackEntry(
 				map.RenderView,
 				request.Route.NavigationData(),

testing/TestHarness/TestHarness.Core/TestSections.cs

@@ -16,6 +16,7 @@ public enum TestSections
 	Apps_Commerce,
 	Apps_Commerce_ShellControl,
 	Apps_ToDo,
+	Apps_Regions,
 	Authentication_Custom,
 	Authentication_Custom_Service,
 	Authentication_Custom_TestBackend,

testing/TestHarness/TestHarness.UITest/Ext/Navigation/Apps/ToDo/Given_Apps_ToDo.cs

@@ -40,4 +40,53 @@ public async Task When_ToDo_Responsive()
 
 	}
 
+	[Test]
+	public async Task When_ToDo_Wide_Nav_ContentControl()
+	{
+		InitTestSection(TestSections.Apps_ToDo);
+
+		App.WaitThenTap("ShowAppButton");
+
+		// Make sure the app has loaded
+		App.WaitElement("WelcomeNavigationBar");
+
+		// Login
+		await App.TapAndWait("LoginButton", "HomeNavigationBar");
+
+		// Select a task list
+		await App.TapAndWait("SelectTaskList2Button", "TaskListNavigationBar");
+
+		await App.TapAndWait("SelectActiveTask1Button", "TaskNavigationBar");
+
+		var screenBefore = TakeScreenshot("When_ToDo_Wide_Nav_ContentControl_Before");
+
+		await App.TapAndWait("DetailsBackButton", "TaskListNavigationBar");
+
+		var screenAfter = TakeScreenshot("When_ToDo_Wide_Nav_ContentControl_After");
+
+		ImageAssert.AreEqual(screenBefore, screenAfter, tolerance: PixelTolerance.Exclusive(Constants.DefaultPixelTolerance));
+	}
+
+	[Test]
+	public async Task When_ToDo_Narrow_Nav_ContentControl()
+	{
+		InitTestSection(TestSections.Apps_ToDo);
+
+		App.WaitThenTap("ShowAppButton");
+
+		App.WaitThenTap("NarrowButton");
+
+		// Make sure the app has loaded
+		App.WaitElement("WelcomeNavigationBar");
+
+		// Login
+		await App.TapAndWait("LoginButton", "HomeNavigationBar");
+
+		// Select a task list
+		await App.TapAndWait("SelectTaskList2Button", "TaskListNavigationBar");
+
+		await App.TapAndWait("SelectActiveTask1Button", "TaskNavigationBar");
+
+		await App.TapAndWait("DetailsBackButton", "TaskListNavigationBar");
+	}
 }

testing/TestHarness/TestHarness/Ext/Navigation/Apps/Regions/FourthData.cs

@@ -0,0 +1,6 @@
+namespace TestHarness.Ext.Navigation.Apps.Regions;
+
+public class FourthData
+{
+	public string Name { get; set; }
+}

testing/TestHarness/TestHarness/Ext/Navigation/Apps/Regions/RegionsFirstPage.xaml

@@ -0,0 +1,66 @@
+<Page x:Class="TestHarness.Ext.Navigation.Apps.Regions.RegionsFirstPage"
+	  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+	  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+	  xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+	  xmlns:local="using:TestHarness.Ext.Navigation.Apps.Regions"
+	  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+	  xmlns:uen="using:Uno.Extensions.Navigation.UI"
+	  xmlns:utu="using:Uno.Toolkit.UI"
+	  Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
+	  mc:Ignorable="d">
+
+	<Grid uen:Region.Attached="True">
+
+		<Grid.RowDefinitions>
+			<RowDefinition Height="Auto" />
+			<RowDefinition Height="Auto" />
+			<RowDefinition />
+		</Grid.RowDefinitions>
+
+		<utu:NavigationBar Content="First Page" Style="{StaticResource MaterialNavigationBarStyle}">
+			<utu:NavigationBar.MainCommand>
+				<AppBarButton uen:Navigation.Request="-" Foreground="{ThemeResource OnSurfaceInverseBrush}">
+					<AppBarButton.Icon>
+						<BitmapIcon UriSource="ms-appx:///Assets/Images/back.png" />
+					</AppBarButton.Icon>
+				</AppBarButton>
+			</utu:NavigationBar.MainCommand>
+		</utu:NavigationBar>
+
+		<Grid Grid.Row="1"
+			  uen:Region.Attached="True"
+			  uen:Region.Navigator="Visibility">
+			<Grid uen:Region.Name="RegionsOne" Visibility="Collapsed">
+				<TextBlock HorizontalAlignment="Center"
+						   VerticalAlignment="Center"
+						   FontSize="24"
+						   Text="One" />
+			</Grid>
+			<Grid uen:Region.Name="RegionsTwo" Visibility="Collapsed">
+				<TextBlock HorizontalAlignment="Center"
+						   VerticalAlignment="Center"
+						   FontSize="24"
+						   Text="Two" />
+			</Grid>
+			<Grid uen:Region.Name="RegionsThree" Visibility="Collapsed">
+				<Frame uen:Region.Attached="True">
+					<StackPanel>
+						<TextBlock HorizontalAlignment="Center"
+								   VerticalAlignment="Center"
+								   FontSize="24"
+								   Text="Three" />
+					</StackPanel>
+				</Frame>
+			</Grid>
+		</Grid>
+		<utu:TabBar Grid.Row="2"
+					VerticalAlignment="Bottom"
+					uen:Region.Attached="True">
+			<utu:TabBar.Items>
+				<utu:TabBarItem uen:Region.Name="RegionsOne" Content="One" />
+				<utu:TabBarItem uen:Region.Name="RegionsTwo" Content="Two" />
+				<utu:TabBarItem uen:Region.Name="RegionsThree" Content="Three" />
+			</utu:TabBar.Items>
+		</utu:TabBar>
+	</Grid>
+</Page>

testing/TestHarness/TestHarness/Ext/Navigation/Apps/Regions/RegionsFirstPage.xaml.cs

@@ -0,0 +1,9 @@
+namespace TestHarness.Ext.Navigation.Apps.Regions;
+
+public sealed partial class RegionsFirstPage : Page
+{
+	public RegionsFirstPage()
+	{
+		this.InitializeComponent();
+	}
+}

testing/TestHarness/TestHarness/Ext/Navigation/Apps/Regions/RegionsFourthPage.xaml

@@ -0,0 +1,35 @@
+<Page x:Class="TestHarness.Ext.Navigation.Apps.Regions.RegionsFourthPage"
+	  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+	  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+	  xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+	  xmlns:local="using:TestHarness.Ext.Navigation.Apps.Regions"
+	  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+	  xmlns:utu="using:Uno.Toolkit.UI"
+	  Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
+	  mc:Ignorable="d">
+
+	<Grid utu:SafeArea.Insets="VisibleBounds">
+		<Grid.RowDefinitions>
+			<RowDefinition Height="Auto" />
+			<RowDefinition />
+		</Grid.RowDefinitions>
+		<utu:NavigationBar Content="Fourth Page">
+			<utu:NavigationBar.MainCommand>
+				<AppBarButton>
+					<AppBarButton.Icon>
+						<BitmapIcon UriSource="ms-appx:///Assets/Images/back.png" />
+					</AppBarButton.Icon>
+				</AppBarButton>
+			</utu:NavigationBar.MainCommand>
+		</utu:NavigationBar>
+		<StackPanel Grid.Row="1"
+					HorizontalAlignment="Center"
+					VerticalAlignment="Center">
+			<TextBlock Margin="8"
+					   HorizontalAlignment="Center"
+					   VerticalAlignment="Center"
+					   Text="{Binding FourthData.Name}" />
+		</StackPanel>
+
+	</Grid>
+</Page>

testing/TestHarness/TestHarness/Ext/Navigation/Apps/Regions/RegionsFourthPage.xaml.cs

@@ -0,0 +1,9 @@
+namespace TestHarness.Ext.Navigation.Apps.Regions;
+
+public sealed partial class RegionsFourthPage : Page
+{
+	public RegionsFourthPage()
+	{
+		this.InitializeComponent();
+	}
+}

testing/TestHarness/TestHarness/Ext/Navigation/Apps/Regions/RegionsFourthViewModel.cs

@@ -0,0 +1,6 @@
+namespace TestHarness.Ext.Navigation.Apps.Regions;
+
+public class RegionsFourthViewModel (FourthData fourthData)
+{
+	public FourthData FourthData { get; set; } = fourthData;
+}

testing/TestHarness/TestHarness/Ext/Navigation/Apps/Regions/RegionsHomePage.xaml

@@ -0,0 +1,49 @@
+<Page x:Class="TestHarness.Ext.Navigation.Apps.Regions.RegionsHomePage"
+	  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+	  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+	  xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+	  xmlns:local="using:TestHarness.Ext.Navigation.Apps.Regions"
+	  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+	  xmlns:muxc="using:Microsoft.UI.Xaml.Controls"
+	  xmlns:uen="using:Uno.Extensions.Navigation.UI"
+	  xmlns:utu="using:Uno.Toolkit.UI"
+	  Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
+	  mc:Ignorable="d">
+
+	<Grid>
+		<muxc:NavigationView Grid.Row="1"
+							 uen:Region.Attached="True"
+							 IsBackButtonVisible="Collapsed"
+							 IsPaneOpen="True"
+							 IsSettingsVisible="False"
+							 OpenPaneLength="200"
+							 PaneDisplayMode="Auto">
+			<muxc:NavigationView.MenuItems>
+
+				<muxc:NavigationViewItem uen:Region.Name="RegionsFirst" Content="First Page">
+					<muxc:NavigationViewItem.Icon>
+						<SymbolIcon Symbol="Accept" />
+					</muxc:NavigationViewItem.Icon>
+				</muxc:NavigationViewItem>
+
+				<muxc:NavigationViewItem uen:Region.Name="RegionsSecond" Content="Second Page">
+					<muxc:NavigationViewItem.Icon>
+						<SymbolIcon Symbol="Share" />
+					</muxc:NavigationViewItem.Icon>
+				</muxc:NavigationViewItem>
+
+				<muxc:NavigationViewItem uen:Region.Name="RegionsThird" Content="Third Page">
+					<muxc:NavigationViewItem.Icon>
+						<SymbolIcon Symbol="OutlineStar" />
+					</muxc:NavigationViewItem.Icon>
+				</muxc:NavigationViewItem>
+
+			</muxc:NavigationView.MenuItems>
+
+			<Grid x:Name="NavigationGrid"
+				  Grid.Column="1"
+				  uen:Region.Attached="True"
+				  uen:Region.Navigator="Visibility" />
+		</muxc:NavigationView>
+	</Grid>
+</Page>

testing/TestHarness/TestHarness/Ext/Navigation/Apps/Regions/RegionsHomePage.xaml.cs

@@ -0,0 +1,10 @@
+namespace TestHarness.Ext.Navigation.Apps.Regions
+{
+	public sealed partial class RegionsHomePage : Page
+	{
+		public RegionsHomePage()
+		{
+			this.InitializeComponent();
+		}
+	}
+}

testing/TestHarness/TestHarness/Ext/Navigation/Apps/Regions/RegionsHostInit.cs

@@ -0,0 +1,39 @@
+namespace TestHarness.Ext.Navigation.Apps.Regions;
+
+public partial class RegionsHostInit : BaseHostInitialization
+{
+	protected override void RegisterRoutes(IViewRegistry views, IRouteRegistry routes)
+	{
+		views.Register(
+			new ViewMap(ViewModel: typeof(RegionsShellModel)),
+			new ViewMap<RegionsHomePage>(),
+			new ViewMap<RegionsFirstPage>(),
+			new ViewMap<RegionsSecondPage, RegionsSecondViewModel>(),
+			new ViewMap<RegionsThirdPage>(),
+			new DataViewMap<RegionsFourthPage, RegionsFourthViewModel, FourthData>()
+		);
+
+		routes.Register(
+			new RouteMap("", View: views.FindByViewModel<RegionsShellModel>(),
+				Nested:
+				[
+					new ("RegionsHome", View: views.FindByView<RegionsHomePage>(),
+						Nested:
+						[
+							new ("RegionsFirst", View: views.FindByView<RegionsFirstPage>(), IsDefault: true,
+								Nested:
+								[
+									new ("RegionsOne", IsDefault: true),
+									new ("RegionsTwo"),
+									new ("RegionsThree")
+								]
+							),
+							new ("RegionsSecond", View: views.FindByViewModel<RegionsSecondViewModel>()),
+							new ("RegionsThird", View: views.FindByView<RegionsThirdPage>()),
+							new ("RegionsFourth", View: views.FindByViewModel<RegionsFourthViewModel>(), DependsOn: "RegionsSecond")
+						]),
+				]
+			)
+		);
+	}
+}

testing/TestHarness/TestHarness/Ext/Navigation/Apps/Regions/RegionsMainPage.xaml

@@ -0,0 +1,67 @@
+<testharness:BaseTestSectionPage x:Class="TestHarness.Ext.Navigation.Apps.Regions.RegionsMainPage"
+								 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+								 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+								 xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+								 xmlns:local="using:TestHarness.Ext.Navigation.Apps.Regions"
+								 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+								 xmlns:muxc="using:Microsoft.UI.Xaml.Controls"
+								 xmlns:testharness="using:TestHarness"
+								 xmlns:uen="using:Uno.Extensions.Navigation.UI"
+								 xmlns:utu="using:Uno.Toolkit.UI"
+								 Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
+								 mc:Ignorable="d">
+
+	<Grid>
+		<Grid.RowDefinitions>
+			<RowDefinition Height="Auto" />
+			<RowDefinition />
+			<RowDefinition Height="Auto" />
+		</Grid.RowDefinitions>
+		<TextBlock Margin="20"
+				   FontSize="30"
+				   Text="Sample App: Regions Tests" />
+		<ScrollViewer Grid.Row="1"
+					  ScrollViewer.HorizontalScrollBarVisibility="Auto"
+					  ScrollViewer.HorizontalScrollMode="Auto"
+					  ScrollViewer.VerticalScrollBarVisibility="Disabled"
+					  ScrollViewer.VerticalScrollMode="Disabled">
+			<Border HorizontalAlignment="Left"
+					VerticalAlignment="Stretch"
+					BorderBrush="Black"
+					BorderThickness="2">
+
+				<utu:ExtendedSplashScreen x:Name="NavigationRoot"
+										  Width="1920"
+										  HorizontalAlignment="Left"
+										  VerticalAlignment="Stretch"
+										  HorizontalContentAlignment="Stretch"
+										  VerticalContentAlignment="Stretch"
+										  AutomationProperties.AutomationId="NavigationRoot" />
+			</Border>
+		</ScrollViewer>
+		<StackPanel Grid.Row="2"
+					HorizontalAlignment="Center"
+					Orientation="Horizontal">
+			<Button AutomationProperties.AutomationId="ShowAppButton"
+					Click="ShowAppClick"
+					Content="Regions App" />
+			<Button AutomationProperties.AutomationId="NarrowButton"
+					Click="NarrowClick"
+					Content="Narrow" />
+			<Button AutomationProperties.AutomationId="WideButton"
+					Click="WideClick"
+					Content="Wide" />
+		</StackPanel>
+		<VisualStateManager.VisualStateGroups>
+			<VisualStateGroup>
+				<VisualState x:Name="NarrowWindow">
+					<VisualState.Setters>
+						<Setter Target="NavigationRoot.Width" Value="400" />
+					</VisualState.Setters>
+				</VisualState>
+				<VisualState x:Name="WideWindow" />
+
+			</VisualStateGroup>
+		</VisualStateManager.VisualStateGroups>
+	</Grid>
+</testharness:BaseTestSectionPage>