[Android] Fixed CollectionView MeasureFirstItem ItemSizingStrategy Not Applied in Horizontal Layouts

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

@@ -151,8 +151,6 @@ _pixelSize is not null &&
 					{
 						_pixelSize = null;
 					}
-
-					_pixelSize = null;
 				}
 			}
 

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

@@ -21,7 +21,14 @@ public static void MapFooterTemplate(StructuredItemsViewHandler<TItemsView> hand
 		}
 
 		public static void MapItemsLayout(StructuredItemsViewHandler<TItemsView> handler, StructuredItemsView itemsView)
-			=> (handler.PlatformView as IMauiRecyclerView<TItemsView>)?.UpdateLayoutManager();
+		{
+			if (handler.PlatformView is IMauiRecyclerView<TItemsView> recyclerView)
+			{
+				recyclerView.UpdateAdapter();
+				recyclerView.UpdateScrollingMode();
+				recyclerView.UpdateLayoutManager();
+			}
+		}
 
 		public static void MapItemSizingStrategy(StructuredItemsViewHandler<TItemsView> handler, StructuredItemsView itemsView)
 			=> (handler.PlatformView as IMauiRecyclerView<TItemsView>)?.UpdateAdapter();

src/Controls/tests/TestCases.HostApp/Issues/Issue29192.cs

@@ -0,0 +1,48 @@
+using System.Collections.ObjectModel;
+
+namespace Maui.Controls.Sample.Issues;
+[Issue(IssueTracker.Github, 29192, "[Android] CollectionView MeasureFirstItem ItemSizingStrategy Not Applied in Horizontal Layouts", PlatformAffected.Android)]
+public class Issue29192 : ContentPage
+{
+	public Issue29192()
+	{
+		CollectionView collectionView = new CollectionView();
+
+		var layout = new Grid();
+		var bindingContext = new Issue29192ViewModel();
+
+		collectionView.BindingContext = bindingContext;
+		collectionView.AutomationId = "CollectionView";
+		collectionView.ItemSizingStrategy = ItemSizingStrategy.MeasureFirstItem;
+		collectionView.ItemsLayout = new LinearItemsLayout(ItemsLayoutOrientation.Horizontal);
+
+		collectionView.ItemTemplate = new DataTemplate(() =>
+		{
+			var label = new Label();
+			label.SetBinding(Label.TextProperty, ".");
+			return label;
+		});
+
+		// Set the ItemsSource binding
+		collectionView.SetBinding(CollectionView.ItemsSourceProperty, "Items");
+		layout.Children.Add(collectionView);
+
+		Content = layout;
+	}
+}
+
+
+public class Issue29192ViewModel
+{
+	public ObservableCollection<string> Items { get; set; }
+
+	public Issue29192ViewModel()
+	{
+		Items = new ObservableCollection<string>
+		{
+			"Short text.",
+			"This is a long text; it should be wrapped to avoid truncation or overflow.",
+			"This is very long text."
+		};
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue29192.cs

@@ -0,0 +1,22 @@
+#if TEST_FAILS_ON_WINDOWS && TEST_FAILS_ON_CATALYST && TEST_FAILS_ON_IOS // CollectionView MeasureFirstItem sizing not applied on Windows, iOS and macOS) https://github.com/dotnet/maui/issues/29130
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue29192 : _IssuesUITest
+{
+	public override string Issue => "[Android] CollectionView MeasureFirstItem ItemSizingStrategy Not Applied in Horizontal Layouts";
+
+	public Issue29192(TestDevice device) : base(device) { }
+
+	[Test]
+	[Category(UITestCategories.CollectionView)]
+	public void ShouldMeasureFirstItemInHorizontalLayouts()
+	{
+		App.WaitForElement("CollectionView");
+		VerifyScreenshot();
+	}
+}
+#endif