Fix crash when dynamically updating Loop in CarouselView

src/Controls/src/Core/Handlers/Items/CarouselViewHandler.Android.cs

@@ -43,6 +43,12 @@ public static void MapPeekAreaInsets(CarouselViewHandler handler, CarouselView c
 			(handler.PlatformView as IMauiRecyclerView<CarouselView>).UpdateAdapter();
 		}
 
+		// TODO: Change the modifier to public in .NET 10.
+		internal static void MapLoop(CarouselViewHandler handler, CarouselView carouselView)
+		{
+			(handler.PlatformView as IMauiRecyclerView<CarouselView>).UpdateAdapter();
+		}
+
 		public static void MapPosition(CarouselViewHandler handler, CarouselView carouselView)
 		{
 			(handler.PlatformView as IMauiCarouselRecyclerView).UpdateFromPosition();

src/Controls/src/Core/Handlers/Items/CarouselViewHandler.cs

@@ -21,7 +21,8 @@ public CarouselViewHandler(PropertyMapper mapper = null) : base(mapper ?? Mapper
 			[Controls.CarouselView.PeekAreaInsetsProperty.PropertyName] = MapPeekAreaInsets,
 			[Controls.CarouselView.IsBounceEnabledProperty.PropertyName] = MapIsBounceEnabled,
 			[Controls.CarouselView.PositionProperty.PropertyName] = MapPosition,
-			[Controls.CarouselView.CurrentItemProperty.PropertyName] = MapCurrentItem
+			[Controls.CarouselView.CurrentItemProperty.PropertyName] = MapCurrentItem,
+			[Controls.CarouselView.LoopProperty.PropertyName] = MapLoop
 		};
 	}
 }

src/Controls/src/Core/Handlers/Items/iOS/CarouselViewController.cs

@@ -440,6 +440,11 @@ void UnsubscribeCollectionItemsSourceChanged(IItemsViewSource oldItemsSource)
 
 		internal void UpdateLoop()
 		{
+			if (!InitialPositionSet)
+			{
+				return;
+			}
+
 			if (ItemsView is not CarouselView carousel)
 			{
 				return;

src/Controls/src/Core/Handlers/Items2/CarouselViewHandler2.iOS.cs

@@ -29,6 +29,7 @@ public CarouselViewHandler2(PropertyMapper mapper = null) : base(mapper ?? Mappe
 			[Controls.CarouselView.PositionProperty.PropertyName] = MapPosition,
 			[Controls.CarouselView.CurrentItemProperty.PropertyName] = MapCurrentItem,
 			[Controls.CarouselView.ItemsLayoutProperty.PropertyName] = MapItemsLayout,
+      [Controls.CarouselView.LoopProperty.PropertyName] = MapLoop
 		};
 	}
 

src/Controls/src/Core/Handlers/Items2/iOS/CarouselViewController2.cs

@@ -368,6 +368,11 @@ internal bool IsUpdating()
 		}
 		internal void UpdateLoop()
 		{
+			if (!InitialPositionSet)
+			{
+				return;
+			}
+
 			if (ItemsView is not CarouselView carousel)
 			{
 				return;

src/Controls/tests/TestCases.HostApp/Issues/Issue29411.xaml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="Controls.TestCases.HostApp.Issues.Issue29411"
+             Title="Issue29411">
+    <ContentPage.Resources>
+        <x:Array x:Key="MyItems" Type="{x:Type x:String}">
+            <x:String>First</x:String>
+            <x:String>Second</x:String>
+            <x:String>Third</x:String>
+        </x:Array>
+    </ContentPage.Resources>
+    <VerticalStackLayout> 
+        <CarouselView x:Name="cview" AutomationId="MauiCarouselView" HeightRequest="300" Loop="True" ItemsSource="{StaticResource MyItems}">
+            <CarouselView.ItemTemplate>
+                <DataTemplate x:DataType="x:String">
+                    <Grid VerticalOptions="Center" HorizontalOptions="Center">
+                        <Border
+                            Stroke="DarkGray"
+                            StrokeThickness="2"
+                            Background="LightBlue"
+                            Padding="20"
+                            HorizontalOptions="Center"
+                            VerticalOptions="Center"
+                            StrokeShape="RoundRectangle 12">
+                            <Label Text="{Binding .}" FontSize="24" HorizontalOptions="Center" VerticalOptions="Center" />
+                        </Border>
+                    </Grid>
+                </DataTemplate>
+            </CarouselView.ItemTemplate>
+        </CarouselView>
+        <Button Text="Change Loop" AutomationId="MauiButton" Clicked="Button_Clicked" />
+    </VerticalStackLayout>
+</ContentPage>

src/Controls/tests/TestCases.HostApp/Issues/Issue29411.xaml.cs

@@ -0,0 +1,14 @@
+namespace Controls.TestCases.HostApp.Issues;
+[Issue(IssueTracker.Github, 29411, "[Android] CarouselView.Loop = false causes crash on Android when changed at runtime", PlatformAffected.All)]
+public partial class Issue29411 : ContentPage
+{
+	public Issue29411()
+	{
+		InitializeComponent();
+	}
+
+	private void Button_Clicked(object sender, EventArgs e)
+	{
+		cview.Loop = !cview.Loop;
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue29411.cs

@@ -0,0 +1,26 @@
+#if !MACCATALYST //Appium Swipe is not working on MACCATALYST
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Tests.Issues;
+
+public class Issue29411 : _IssuesUITest
+{
+	public Issue29411(TestDevice device) : base(device)
+	{
+	}
+
+	public override string Issue => "[Android] CarouselView.Loop = false causes crash on Android when changed at runtime";
+
+    [Test]
+	[Category(UITestCategories.CarouselView)]
+	public void ChangingLoopToFalseShouldNotCrash()
+	{
+		App.WaitForElement("MauiButton");
+		App.Tap("MauiButton");
+		App.SwipeRightToLeft("MauiCarouselView");
+        App.WaitForElement("MauiCarouselView");
+	}
+}
+#endif