Fixed BoxView in AbsoluteLayout did not return to its default AutoSize for Height and Width after reset

src/Controls/tests/TestCases.HostApp/Issues/Issue31496.cs

@@ -0,0 +1,68 @@
+using Microsoft.Maui.Layouts;
+
+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 31496, "BoxView in AbsoluteLayout does not return to default AutoSize", PlatformAffected.iOS | PlatformAffected.macOS)]
+public class Issue31496 : ContentPage
+{
+	AbsoluteLayout absoluteLayout;
+	BoxView boxView;
+	readonly Rect defaultBounds = new Rect(0, 0, AbsoluteLayout.AutoSize, AbsoluteLayout.AutoSize);
+
+	public Issue31496()
+	{
+		absoluteLayout = new AbsoluteLayout
+		{
+			BackgroundColor = Colors.LightGray
+		};
+
+		var label = new Label
+		{
+			Text = "The test passes if a BoxView is not visible in view.",
+		};
+		AbsoluteLayout.SetLayoutBounds(label, new Rect(0.5, 0.80, AbsoluteLayout.AutoSize, AbsoluteLayout.AutoSize));
+		AbsoluteLayout.SetLayoutFlags(label, AbsoluteLayoutFlags.PositionProportional);
+
+		boxView = new BoxView
+		{
+			Color = Colors.Green
+		};
+		AbsoluteLayout.SetLayoutBounds(boxView, new Rect(0, 0, AbsoluteLayout.AutoSize, AbsoluteLayout.AutoSize));
+		AbsoluteLayout.SetLayoutFlags(boxView, AbsoluteLayoutFlags.None);
+
+		var changeBoundsButton = new Button
+		{
+			Text = "Change Bounds",
+			AutomationId = "Issue31496ChangeBoundsButton"
+		};
+		AbsoluteLayout.SetLayoutBounds(changeBoundsButton, new Rect(0.5, 0.90, AbsoluteLayout.AutoSize, AbsoluteLayout.AutoSize));
+		AbsoluteLayout.SetLayoutFlags(changeBoundsButton, AbsoluteLayoutFlags.PositionProportional);
+		changeBoundsButton.Clicked += OnChangeBoundsClicked;
+
+		var resetBoundsButton = new Button
+		{
+			Text = "Reset Bounds",
+			AutomationId = "Issue31496ResetButton"
+		};
+		AbsoluteLayout.SetLayoutBounds(resetBoundsButton, new Rect(0.5, 0.99, AbsoluteLayout.AutoSize, AbsoluteLayout.AutoSize));
+		AbsoluteLayout.SetLayoutFlags(resetBoundsButton, AbsoluteLayoutFlags.PositionProportional);
+		resetBoundsButton.Clicked += OnResetBoundsClicked;
+
+		absoluteLayout.Children.Add(boxView);
+		absoluteLayout.Children.Add(label);
+		absoluteLayout.Children.Add(changeBoundsButton);
+		absoluteLayout.Children.Add(resetBoundsButton);
+
+		Content = absoluteLayout;
+	}
+
+	void OnChangeBoundsClicked(object sender, EventArgs e)
+	{
+		AbsoluteLayout.SetLayoutBounds(boxView, new Rect(50, 50, 100, 100));
+	}
+
+	void OnResetBoundsClicked(object sender, EventArgs e)
+	{
+		AbsoluteLayout.SetLayoutBounds(boxView, defaultBounds);
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue31496.cs

@@ -0,0 +1,25 @@
+using System;
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue31496 : _IssuesUITest
+{
+    public Issue31496(TestDevice testDevice) : base(testDevice)
+    {
+    }
+    public override string Issue => "BoxView in AbsoluteLayout does not return to default AutoSize";
+
+    [Test]
+    [Category(UITestCategories.Layout)]
+    public void BoxViewInAbsoluteLayoutReturnsToDefaultAutoSize()
+    {
+        App.WaitForElement("Issue31496ChangeBoundsButton");
+        App.Tap("Issue31496ChangeBoundsButton");
+        App.WaitForElement("Issue31496ResetButton");
+        App.Tap("Issue31496ResetButton");
+        VerifyScreenshot();
+    }
+}

src/Core/src/Handlers/ShapeView/ShapeViewHandler.iOS.cs

@@ -60,5 +60,22 @@ public static void MapStrokeMiterLimit(IShapeViewHandler handler, IShapeView sha
 		{
 			handler.PlatformView?.InvalidateShape(shapeView);
 		}
+
+		public override Size GetDesiredSize(double widthConstraint, double heightConstraint)
+		{
+			var result = base.GetDesiredSize(widthConstraint, heightConstraint);
+
+			if (double.IsNaN(VirtualView.Width))
+			{
+				result.Width = 0;
+			}
+
+			if (double.IsNaN(VirtualView.Height))
+			{
+				result.Height = 0;
+			}
+
+			return result;
+		}
 	}
 }

src/Core/src/PublicAPI/net-ios/PublicAPI.Unshipped.txt

@@ -157,3 +157,4 @@ virtual Microsoft.Maui.SwipeViewSwipeStarted.<Clone>$() -> Microsoft.Maui.SwipeV
 virtual Microsoft.Maui.SwipeViewSwipeStarted.EqualityContract.get -> System.Type!
 virtual Microsoft.Maui.SwipeViewSwipeStarted.Equals(Microsoft.Maui.SwipeViewSwipeStarted? other) -> bool
 virtual Microsoft.Maui.SwipeViewSwipeStarted.PrintMembers(System.Text.StringBuilder! builder) -> bool
+override Microsoft.Maui.Handlers.ShapeViewHandler.GetDesiredSize(double widthConstraint, double heightConstraint) -> Microsoft.Maui.Graphics.Size

src/Core/src/PublicAPI/net-maccatalyst/PublicAPI.Unshipped.txt

@@ -157,3 +157,4 @@ virtual Microsoft.Maui.SwipeViewSwipeStarted.<Clone>$() -> Microsoft.Maui.SwipeV
 virtual Microsoft.Maui.SwipeViewSwipeStarted.EqualityContract.get -> System.Type!
 virtual Microsoft.Maui.SwipeViewSwipeStarted.Equals(Microsoft.Maui.SwipeViewSwipeStarted? other) -> bool
 virtual Microsoft.Maui.SwipeViewSwipeStarted.PrintMembers(System.Text.StringBuilder! builder) -> bool
+override Microsoft.Maui.Handlers.ShapeViewHandler.GetDesiredSize(double widthConstraint, double heightConstraint) -> Microsoft.Maui.Graphics.Size