2174059 MAUI hit testing ignores pages loaded by PushModalAsync (#24109)

* MAUI hit testing ignores pages loaded by PushModalAsync

Updated VisualTreeElementExtension to get the MauiWinUiWindow Element, as its content member gets modal content in addition to underlying content

* PR Feedback

Update the code to use the UI.Xaml.Window instead of the MauiWinUIWindow

src/Core/src/Core/Extensions/VisualTreeElementExtensions.cs

@@ -136,7 +136,12 @@ static List<IVisualTreeElement> GetVisualTreeElementsWindowsInternal(IVisualTree
 			var visualElements = new List<IVisualTreeElement>();
 			if (visualElement is IWindow window)
 			{
-				uiElement = window.Content?.ToPlatform();
+				// Get the UI.Xaml.Window so we catch everything in the app window rather than the frame which doesn't include modal content
+				var platformView = window.Handler?.PlatformView;
+				if (platformView is UI.Xaml.Window winUiWindow)
+				{
+					uiElement = winUiWindow.Content;
+				}
 			}
 			else if (visualElement is IView view)
 			{