Fix XamlRoot being set incorrectly in Popup Handler when using modal navigation in Windows

Author: ne0rrmatrix

src/CommunityToolkit.Maui.Core/Handlers/Popup/PopUpHandler.windows.cs

@@ -41,9 +41,8 @@ public static void MapOnOpened(PopupHandler handler, IPopup view, object? result
 		ArgumentNullException.ThrowIfNull(handler.MauiContext);
 
 		var parent = view.Parent.ToPlatform(handler.MauiContext);
-
 		parent.IsHitTestVisible = false;
-		handler.PlatformView.XamlRoot = parent.XamlRoot;
+		handler.PlatformView.XamlRoot = view.GetWindow().Content?.Handler?.MauiContext?.GetPlatformWindow().Content.XamlRoot ?? throw new InvalidOperationException("Window Content cannot be null");
 		handler.PlatformView.IsHitTestVisible = true;
 		handler.PlatformView.IsOpen = true;