[Windows] Test inclusion for the PointerGestureRecognizer issue in MultiWindow. (#31143)

* Included the test for the PointerGesture Issue on windows

* Used Windows API for minimizing the window

* Minimize the window using GetWindowHandle

* prevent unwanted issues

Author: Ahamed-Ali

src/Controls/tests/TestCases.HostApp/Issues/Issue30536.cs

@@ -0,0 +1,154 @@
+#if WINDOWS
+using System.Runtime.InteropServices;
+#endif
+
+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 30536, "[Windows] PointerGestureRecognizer behaves incorrectly when multiple windows are open", PlatformAffected.UWP)]
+public class Issue30536 : ContentPage
+{
+	Button newWindowButton;
+	Button closeNewWindowButton;
+	Button minimizeSecondWindowButton;
+	Label pointerEnterCountLabel;
+	Label pointerExitCountLabel;
+	Border theBorder;
+	int enterCount = 0;
+	int exitCount = 0;
+	Window secondWindow;
+	public Issue30536()
+	{
+		InitializeUI();
+	}
+
+	private void InitializeUI()
+	{
+		// Create the VerticalStackLayout
+		var stackLayout = new VerticalStackLayout
+		{
+			Spacing = 5
+		};
+
+		// Create New Window button
+		newWindowButton = new Button
+		{
+			Text = "New Window",
+			AutomationId = "NewWindowButton"
+		};
+		newWindowButton.Clicked += OnNewWindowButton_Clicked;
+
+		closeNewWindowButton = new Button
+		{
+			Text = "Close New Window",
+			AutomationId = "CloseNewWindowButton"
+		};
+		closeNewWindowButton.Clicked += (sender, e) =>
+		{
+			if (secondWindow != null)
+			{
+				Application.Current.CloseWindow(secondWindow);
+				secondWindow = null;
+			}
+		};
+
+		minimizeSecondWindowButton = new Button
+		{
+			Text = "Minimize Second Window",
+			AutomationId = "MinimizeSecondWindowButton"
+		};
+		minimizeSecondWindowButton.Clicked += (sender, e) =>
+		{
+			if (secondWindow != null)
+			{
+				MinimizeWindow(secondWindow);
+			}
+		};
+
+		// Create pointer enter count label
+		pointerEnterCountLabel = new Label
+		{
+			Text = $"Pointer Enter Count: {enterCount}",
+			AutomationId = "PointerEnterCountLabel"
+
+		};
+
+		pointerExitCountLabel = new Label
+		{
+			Text = $"Pointer Exit Count: {exitCount}",
+			AutomationId = "PointerExitCountLabel"
+
+		};
+
+		// Create the border with red background
+		theBorder = new Border
+		{
+			WidthRequest = 500,
+			HeightRequest = 500,
+			BackgroundColor = Colors.Red,
+			Content = new Button
+			{
+				Text = "Tap Me",
+				AutomationId = "BorderButton"
+			}
+		};
+
+		// Create and add PointerGestureRecognizer
+		var pointerGestureRecognizer = new PointerGestureRecognizer();
+		pointerGestureRecognizer.PointerEntered += OnPointerGestureRecognizer_PointerEntered;
+		pointerGestureRecognizer.PointerExited += OnPointerGestureRecognizer_PointerExited;
+		theBorder.GestureRecognizers.Add(pointerGestureRecognizer);
+
+		// Add all elements to the stack layout
+		stackLayout.Children.Add(minimizeSecondWindowButton);
+		stackLayout.Children.Add(newWindowButton);
+		stackLayout.Children.Add(closeNewWindowButton);
+		stackLayout.Children.Add(pointerEnterCountLabel);
+		stackLayout.Children.Add(pointerExitCountLabel);
+		stackLayout.Children.Add(theBorder);
+
+		// Set the content
+		Content = stackLayout;
+	}
+
+#if WINDOWS
+	// Windows API declarations
+	[DllImport("user32.dll")]
+	private static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
+ 
+	// ShowWindow constants
+	private const int SW_MINIMIZE = 6;
+#endif
+
+	private void OnNewWindowButton_Clicked(object sender, EventArgs e)
+	{
+		secondWindow = new Window(new ContentPage());
+		Application.Current.OpenWindow(secondWindow);
+	}
+
+	private void MinimizeWindow(Window window)
+	{
+#if WINDOWS
+		if (window.Handler?.PlatformView is Microsoft.UI.Xaml.Window win)
+		{
+			// Get window handle directly from MAUI's platform view
+			var hwnd = WinRT.Interop.WindowNative.GetWindowHandle(win);
+			if (hwnd != IntPtr.Zero)
+			{
+				ShowWindow(hwnd, SW_MINIMIZE);
+			}
+		}
+#endif
+	}
+	private void OnPointerGestureRecognizer_PointerEntered(object sender, PointerEventArgs e)
+	{
+		theBorder.BackgroundColor = Colors.Lime;
+		enterCount++;
+		pointerEnterCountLabel.Text = $"Pointer Enter Count: {enterCount}";
+	}
+	private void OnPointerGestureRecognizer_PointerExited(object sender, PointerEventArgs e)
+	{
+		theBorder.BackgroundColor = Colors.Red;
+		exitCount++;
+		pointerExitCountLabel.Text = $"Pointer Exit Count: {exitCount}";
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue30536.cs

@@ -0,0 +1,33 @@
+#if WINDOWS
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+ 
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+public class Issue30536 : _IssuesUITest
+{
+	public Issue30536(TestDevice device) : base(device) { }
+	
+	public override string Issue => "[Windows] PointerGestureRecognizer behaves incorrectly when multiple windows are open";
+ 
+	[Test]
+	[Category(UITestCategories.Gestures)]
+	public void PointerGesturesShouldWorkProperlyOnMultiWindows()
+	{
+		App.WaitForElement("NewWindowButton");
+		App.Tap("NewWindowButton");
+		App.WaitForElement("MinimizeSecondWindowButton");
+		App.Tap("MinimizeSecondWindowButton");
+		App.WaitForElement("BorderButton");
+		App.Tap("BorderButton");
+		var pointerEnterCount = App.FindElement("PointerEnterCountLabel");
+		Assert.That(pointerEnterCount.GetText(), Is.EqualTo("Pointer Enter Count: 1"));
+ 
+		var pointerExitCount = App.FindElement("PointerExitCountLabel");
+		Assert.That(pointerExitCount.GetText(), Is.EqualTo("Pointer Exit Count: 0"));
+		//once verified that pointer enter and exit counts are correct, close the newly created window
+		App.WaitForElement("CloseNewWindowButton");
+		App.Tap("CloseNewWindowButton");
+	}
+}
+#endif