prevent excess layout passes in layout manager to catch other scenarios causing

excessive layout passes.

src/Avalonia.Base/Layout/LayoutManager.cs

@@ -28,7 +28,7 @@ namespace Avalonia.Layout
         public LayoutManager(ILayoutRoot owner)
         {
             _owner = owner ?? throw new ArgumentNullException(nameof(owner));
-            _executeLayoutPass = ExecuteLayoutPass;
+            _executeLayoutPass = ExecuteQueuedLayoutPass;
         }
 
         public virtual event EventHandler? LayoutUpdated;
@@ -94,6 +94,16 @@ namespace Avalonia.Layout
             QueueLayoutPass();
         }
 
+        private void ExecuteQueuedLayoutPass()
+        {
+            if (!_queued)
+            {
+                return;
+            }
+            
+            ExecuteLayoutPass();
+        }
+
         /// <inheritdoc/>
         public virtual void ExecuteLayoutPass()
         {
@@ -319,8 +329,8 @@ namespace Avalonia.Layout
         {
             if (!_queued && !_running)
             {
-                Dispatcher.UIThread.Post(_executeLayoutPass, DispatcherPriority.Layout);
                 _queued = true;
+                Dispatcher.UIThread.Post(_executeLayoutPass, DispatcherPriority.Layout);
             }
         }
 

src/Avalonia.Controls/TopLevel.cs

@@ -413,11 +413,7 @@ namespace Avalonia.Controls
             FrameSize = PlatformImpl!.FrameSize;
             Width = clientSize.Width;
             Height = clientSize.Height;
-            
-            // 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);
-            
+            LayoutManager.ExecuteLayoutPass();
             Renderer?.Resized(clientSize);
         }
 

src/Avalonia.Controls/WindowBase.cs

@@ -220,11 +220,7 @@ namespace Avalonia.Controls
         {
             ClientSize = clientSize;
             FrameSize = PlatformImpl?.FrameSize;
-            
-            // 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);
-            
+            LayoutManager.ExecuteLayoutPass();
             Renderer?.Resized(clientSize);
         }