Removing a ChildViewModel does not re-validate the ParentViewModel

[lipchev]

Removing a ChildViewModel does not re-validate the ParentViewModel

[lipchev]

Here is my quick work-around:

public class ParentViewModelValidationAuditor : AuditorBase
{
    private readonly Dictionary<IViewModel, IViewModel> _viewModels = new();

    public override void OnViewModelInitialized(IViewModel viewModel)
    {
        if (viewModel is ViewModelBase { ParentViewModel: { } parentViewModel })
        {
            _viewModels[viewModel] = parentViewModel;
        }
    }

    public override void OnViewModelClosed(IViewModel viewModel)
    {
        if (_viewModels.Remove(viewModel, out var parentViewModel) && viewModel.HasErrors)
        {
            parentViewModel.Validate();
        }
    }
}

[GeertvanHorrik]

Interesting find! Would you be willing to create a PR on the develop branch (6.0.0-alpha) with a unit test and fix?