clear layout jobs instead of explicit layout call.

src/Avalonia.Controls/TopLevel.cs

@@ -13,6 +13,7 @@ using Avalonia.Media;
 using Avalonia.Platform;
 using Avalonia.Rendering;
 using Avalonia.Styling;
+using Avalonia.Threading;
 using Avalonia.Utilities;
 using Avalonia.VisualTree;
 
@@ -412,7 +413,11 @@ namespace Avalonia.Controls
             FrameSize = PlatformImpl!.FrameSize;
             Width = clientSize.Width;
             Height = clientSize.Height;
-            LayoutManager.ExecuteLayoutPass();
+            
+            // Setting ClientSize and Width / Height above caused ExecuteLayoutPass to be queued.
+            // Instead of explicitly calling LayoutManager.ExecuteLayoutPass here, we clear the job queue.
+            Dispatcher.UIThread.RunJobs(DispatcherPriority.Layout);
+            
             Renderer?.Resized(clientSize);
         }
 

src/Avalonia.Controls/WindowBase.cs

@@ -8,6 +8,7 @@ using Avalonia.Controls.Primitives;
 using Avalonia.Input;
 using Avalonia.Layout;
 using Avalonia.Platform;
+using Avalonia.Threading;
 using JetBrains.Annotations;
 
 namespace Avalonia.Controls
@@ -219,7 +220,11 @@ namespace Avalonia.Controls
         {
             ClientSize = clientSize;
             FrameSize = PlatformImpl?.FrameSize;
-            LayoutManager.ExecuteLayoutPass();
+            
+            // Setting ClientSize and Width / Height above caused ExecuteLayoutPass to be queued.
+            // Instead of explicitly calling LayoutManager.ExecuteLayoutPass here, we clear the job queue.
+            Dispatcher.UIThread.RunJobs(DispatcherPriority.Layout);
+            
             Renderer?.Resized(clientSize);
         }