InvokeShutdown

src/Avalonia.Base/Threading/Dispatcher.MainLoop.cs

@@ -97,6 +97,12 @@ public partial class Dispatcher
     /// </summary>
     public void BeginInvokeShutdown(DispatcherPriority priority) => Post(StartShutdownImpl, priority);
 
+    
+    /// <summary>
+    /// Initiates the shutdown process of the Dispatcher synchronously.
+    /// </summary>
+    public void InvokeShutdown() => Invoke(StartShutdownImpl, DispatcherPriority.Send);
+
     private void StartShutdownImpl()
     {
         if (!_startingShutdown)

src/Avalonia.Controls/ApplicationLifetimes/ClassicDesktopStyleApplicationLifetime.cs

@@ -184,7 +184,7 @@ namespace Avalonia.Controls.ApplicationLifetimes
                 _cts?.Cancel();
                 _cts = null;
                 _isShuttingDown = false;
-                Dispatcher.UIThread.BeginInvokeShutdown(DispatcherPriority.Send);
+                Dispatcher.UIThread.InvokeShutdown();
             }
 
             return true;