[MAUI-Windows] Unhandled layout cycle exception occurs when setting "IsVisible = False" inside FlexLayout

Description

I am trying to add a view (say Grid) inside a FlexLayout. After added the view, when I set “IsVisible” property of the grid at the run time. I am facing the below unhandled exception

Exception: “A cycle occurred while laying out the GUI.” Message: “Layout cycle detected. Layout could not complete.”

Note: This occurs with all kind of MAUI views inside a FlexLayout.

Steps to Reproduce

1. Create a new MAUI App.
2. Add a view (say grid) inside the flex layout.
3. Use a switch control to to toggle the visibility of the view at the run time.
4. Run the sample.
5. Disable the view at the run time by setting its property “IsVisible=false”. Now the unhandled Exception will be thrown.

I have attached a sample to reproduce the issue. MauiApp1.zip

Run the attached sample and toggle the switch control “Make Visible”, in the left top of the app.

Version with bug

6.0.419

Last version that worked well

Unknown/Other

Affected platforms

Windows

Affected platform versions

Windows SDK 10.0.19041

Did you find any workaround?

No

Relevant log output

No logs obtained due to unhandled exception occurs.

[AppXture]

I’m having similar issues that started today after updating VS 2022 to 17.3 and VS2022 Preview to 17.4.

My steps to reproduce is that I have a FlexLayout on a ContentPage and if I add anything to it then I get the error. If I comment out the FlexLayout or it’s contents then no error.

It’s been working fine until the latest Visual Studio updates. Not sure which version of Windows SDK I was on before but I’m on 10.0.19041 now.

[holecekp]

I have installed the latest 7.0.49 version and my app is still crashing as before. I first thought that the bug has not been fixed. But then I noticed that the error message is different and that it crashes after the update even if I remove the flex layout. I have downloaded the repro project from this issue, and tried it with the latest .net6 and .net7 version, and it works without crashing.

So yes, this bug has been fixed but it was replaced by another one that crashes the app in different more general situations. If I have time, I will try to find the problem, create a repro project and file a new issue for it. It seems that MAUI on .NET 7 have problem with some lazily-loaded views (even without flex layout) that used to work in Xamarin.Forms and older versions of MAUI. When a lazily-loaded view should be loaded and the LazyView.Content is set to the newly created view, the app crashes:

Exception thrown: 'System.InvalidOperationException' in Microsoft.Maui.dll
The handler's MauiContext cannot be null.

This is a Windows-only problem. It works on Android. I will investigate it more and file a new issue.