Fix display of ActionSheet in modal view on Windows (dotnet#21295)

* Fix display of ActionSheet in modal view on Windows

* Add ui test to validate DisplayActionSheet behaviro in modal dialog

* Give ActionSheet title an AutomationId to improve testing

* Replace baseline with image from ci/cd

* Undo change to app.xaml

* Update AlertManager.Windows.cs

src/Controls/samples/Controls.Sample.UITests/Issues/Issue14829.cs

@@ -0,0 +1,44 @@
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Graphics;
+
+namespace Maui.Controls.Sample.Issues
+{
+	[Issue(IssueTracker.Github, 14829, "DisplayActionSheet still not working on Windows", PlatformAffected.UWP)]
+	public class Issue14829 : TestContentPage
+	{
+		protected override void Init()
+		{
+			var navPage = new NavigationPage(new MainPage());
+			NavigatedTo += Issue14829_NavigatedTo;
+
+			async void Issue14829_NavigatedTo(object sender, NavigatedToEventArgs e)
+			{
+				NavigatedTo -= Issue14829_NavigatedTo;
+
+				await Navigation.PushModalAsync(navPage);
+			}
+		}
+
+		public partial class MainPage : ContentPage
+		{
+			protected override void OnAppearing()
+			{
+				Content = new VerticalStackLayout()
+				{
+					new Button()
+					{
+						AutomationId = "DisplayActionSheetButton",
+						Command = new Command(async () =>
+						{
+							await DisplayActionSheet("ActionSheet: Send to?", "Cancel", null, "Email", "Twitter", "Facebook");
+						}),
+						Text = "Click to Display Action Sheet"
+					}
+				};
+				Content.BackgroundColor = Colors.White;
+
+				base.OnAppearing();
+			}
+		}
+	}
+}

src/Controls/src/Core/Platform/AlertManager/ActionSheetDialog.Windows.cs

@@ -20,6 +20,8 @@ public ActionSheetContent(ActionSheetArguments sheetOptions)
 			_options = sheetOptions;
 
 			TitleBlock.Text = _options.Title ?? string.Empty;
+			TitleBlock.SetAutomationPropertiesAutomationId("ActionSheetTitle");
+
 			OptionsList.ItemsSource = _options.Buttons.ToList();
 
 			if (_options.FlowDirection == Maui.FlowDirection.RightToLeft)

src/Controls/src/Core/Platform/AlertManager/AlertManager.Windows.cs

@@ -209,7 +209,7 @@ void OnActionSheetRequested(Page sender, ActionSheetArguments arguments)
 
 				try
 				{
-					var current = sender.ToPlatform(VirtualView.RequireMauiContext());
+					var current = sender.ToPlatform();
 					var pageParent = current?.Parent as FrameworkElement;
 
 					if (pageParent != null)
@@ -252,4 +252,4 @@ bool PageIsInThisWindow(Page page) =>
 				page?.Window == VirtualView;
 		}
 	}
-}
+}

src/Controls/tests/UITests/Tests/Issues/Issue14829.cs

@@ -0,0 +1,27 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.AppiumTests.Issues
+{
+	public class Issue14829 : _IssuesUITest
+	{
+		public Issue14829(TestDevice device) : base(device)
+		{
+		}
+
+		public override string Issue => "DisplayActionSheet still not working on Windows";
+
+		[Test]
+		[Category(UITestCategories.ActionSheet)]
+		public void Issue14829Test()
+		{
+			this.IgnoreIfPlatforms(new TestDevice[] { TestDevice.Android, TestDevice.Mac, TestDevice.iOS }, "Only affects Windows.");
+
+			App.WaitForElement("DisplayActionSheetButton", timeout: TimeSpan.FromSeconds(4)).Click();
+			App.WaitForElement("ActionSheetTitle", timeout: TimeSpan.FromSeconds(4));
+
+			VerifyScreenshot();
+		}
+	}
+}