[Android] invalidate shadows on parent's size change

src/Controls/tests/TestCases.HostApp/Issues/Issue24034.cs

@@ -0,0 +1,16 @@
+namespace Maui.Controls.Sample.Issues;
+
+[XamlCompilation(XamlCompilationOptions.Compile)]
+[Issue(IssueTracker.Github, 24034, "Shadow is not updating on change of parent control", PlatformAffected.All)]
+public partial class Issue24034 : ContentPage
+{
+	public Issue24034()
+	{
+		InitializeComponent();
+	}
+
+	private void Button_Clicked(object sender, EventArgs e)
+	{
+		GridView.IsVisible = !GridView.IsVisible;
+	}
+}

src/Controls/tests/TestCases.HostApp/Issues/Issue24034.xaml

@@ -0,0 +1,45 @@
+<?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="Maui.Controls.Sample.Issues.Issue24034">
+    <Grid RowDefinitions="300,Auto" Margin="10" ColumnSpacing="0" Padding="5,0" ColumnDefinitions="*,*,Auto">
+
+        <Border 
+            Grid.Column="0" 
+            HeightRequest="150"
+            Grid.Row="0"
+            StrokeShape="RoundRectangle 16,16,16,16"
+            Margin="5,0">
+            <Border.Shadow>
+                <Shadow Brush="Red"
+                        Offset="2,10"
+                        Radius="{OnPlatform Android=9, iOS=12}"
+                        Opacity="1" />
+            </Border.Shadow>
+            <BoxView BackgroundColor="Green"/>
+        </Border>
+
+        <Border 
+                Grid.Column="1" Grid.Row="0"
+                HeightRequest="150"
+                StrokeShape="RoundRectangle 16,16,16,16"
+                Margin="5,0">
+                <Border.Shadow>
+                    <Shadow Brush="Red"
+                            Offset="2,10"
+                            Radius="{OnPlatform Android=9, iOS=12}"
+                            Opacity="1" />
+                </Border.Shadow>
+
+                <BoxView BackgroundColor="Green"/>
+            </Border>
+
+        <Grid x:Name="GridView" Margin="5,0"
+                        Padding="0, 5, 0, 0"
+                        Grid.Column="2">
+            <BoxView WidthRequest="100" Height="100"/>
+        </Grid>
+
+        <Button Grid.Row="1" Grid.ColumnSpan="3" AutomationId="button" Text="Click" Clicked="Button_Clicked"/>
+    </Grid>
+</ContentPage>

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue24034.cs

@@ -0,0 +1,20 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue24034(TestDevice device) : _IssuesUITest(device)
+{
+	public override string Issue => "Shadow is not updating on change of parent control"; 
+
+	[Test]
+	[Category(UITestCategories.Border)]
+	public void ShadowShouldUpdate()
+	{
+		App.WaitForElement("button");
+		App.Click("button");
+
+		VerifyScreenshot();
+	}
+}

src/Core/src/Platform/Android/WrapperView.cs

@@ -55,6 +55,7 @@ protected override void OnLayout(bool changed, int left, int top, int right, int
 			var widthMeasureSpec = MeasureSpecMode.Exactly.MakeMeasureSpec(right - left);
 			var heightMeasureSpec = MeasureSpecMode.Exactly.MakeMeasureSpec(bottom - top);
 
+			_invalidateShadow = true;
 			child.Measure(widthMeasureSpec, heightMeasureSpec);
 			child.Layout(0, 0, child.MeasuredWidth, child.MeasuredHeight);
 			_borderView?.Layout(0, 0, child.MeasuredWidth, child.MeasuredHeight);