Code which causes Environment.Exit hang

gistfile1.txt

using System;
using System.Windows;

namespace CefSharp.MinimalExample.Wpf
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            AppDomain.CurrentDomain.ProcessExit += CurrentDomain_ProcessExit;
        }

        void CurrentDomain_ProcessExit(object sender, EventArgs e)
        {
           Application.Current.Dispatcher.Invoke(new Action(Cef.Shutdown));
            
        }

        private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
        {
            Environment.Exit(0);
        }
    }
}

Created for cefsharp/CefSharp#990

The hang occurs whether or not you call Shutdown