[Windows] Fixed Shadow not updated when Clipping a View with a shadow

src/Controls/tests/TestCases.HostApp/Issues/Issue27730.cs

@@ -0,0 +1,83 @@
+using Microsoft.Maui.Controls.Shapes;
+
+namespace Maui.Controls.Sample.Issues
+{
+	[Issue(IssueTracker.Github, 27730, "Shadow not updated when Clipping a View with a shadow", PlatformAffected.UWP)]
+	public class Issue27730 : TestContentPage
+	{
+		Border _borderWithShadow;
+		Border _normalBorder;
+
+		protected override void Init()
+		{
+			VerticalStackLayout rootLayout = new VerticalStackLayout
+			{
+				Spacing = 10,
+				Padding = 10
+			};
+
+			Label shadowLabel = new Label { Text = "Border with Shadow, Clipping applied at runtime" };
+			Label clipLabel = new Label { Text = "Normal Border without shadow, Clipping first, Shadow added later" };
+
+			_borderWithShadow = CreateBorder(true);
+			_normalBorder = CreateBorder(false);
+
+			Button applyClipButton = new Button { Text = "Apply Clip", AutomationId = "ApplyClipBtn" };
+			Button applyShadowButton = new Button { Text = "Apply Shadow", AutomationId = "ApplyShadowBtn" };
+
+			applyClipButton.Clicked += (s, e) => ApplyClip();
+			applyShadowButton.Clicked += (s, e) => ApplyShadow();
+
+			rootLayout.Add(shadowLabel);
+			rootLayout.Add(_borderWithShadow);
+			rootLayout.Add(clipLabel);
+			rootLayout.Add(_normalBorder);
+			rootLayout.Add(applyClipButton);
+			rootLayout.Add(applyShadowButton);
+			Content = rootLayout;
+		}
+
+		Border CreateBorder(bool withShadow)
+		{
+			return new Border
+			{
+				StrokeShape = new RoundRectangle { CornerRadius = new CornerRadius(24) },
+				Background = Colors.Red,
+				WidthRequest = 100,
+				HeightRequest = 100,
+				Margin = new Thickness(12, 0),
+				Shadow = withShadow ? new Shadow
+				{
+					Brush = Colors.Black,
+					Offset = new Point(12, 12),
+					Radius = 10,
+					Opacity = 1
+				} : null
+			};
+		}
+
+		void ApplyClip()
+		{
+			EllipseGeometry clipGeometry = new EllipseGeometry
+			{
+				Center = new Point(50, 50),
+				RadiusX = 25,
+				RadiusY = 25
+			};
+
+			_borderWithShadow.Clip = clipGeometry;
+			_normalBorder.Clip = clipGeometry;
+		}
+
+		void ApplyShadow()
+		{
+			_normalBorder.Shadow = new Shadow
+			{
+				Brush = Colors.Black,
+				Offset = new Point(12, 12),
+				Radius = 10,
+				Opacity = 1
+			};
+		}
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue27730.cs

@@ -0,0 +1,25 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue27730 : _IssuesUITest
+	{
+		public Issue27730(TestDevice testDevice) : base(testDevice)
+		{
+		}
+
+		public override string Issue => "Shadow not updated when Clipping a View with a shadow";
+
+		[Test]
+		[Category(UITestCategories.Visual)]
+		public void ShadowShouldUpdateWhenClipping()
+		{
+			App.WaitForElement("ApplyShadowBtn");
+			App.Tap("ApplyClipBtn");
+			App.Tap("ApplyShadowBtn");
+			VerifyScreenshot();
+		}
+	}
+}

src/Core/src/Platform/Windows/WrapperView.cs

@@ -121,6 +121,8 @@ void UpdateClip()
 			var geometricClip = compositor.CreateGeometricClip(pathGeometry);
 
 			visual.Clip = geometricClip;
+			//When the clip is updated, the shadow must be updated as well
+			UpdateShadowAsync().FireAndForget(IPlatformApplication.Current?.Services?.CreateLogger(nameof(WrapperView)));
 		}
 
 		void DisposeClip()