Merge pull request #3773 from AvaloniaUI/x11-popup-no-resized

[X11] Don't trigger Resized event on ConfigureEvent for popups

src/Avalonia.X11/X11Window.cs

@@ -422,7 +422,7 @@ namespace Avalonia.X11
                             updatedSizeViaScaling = UpdateScaling();
                         }
 
-                        if (changedSize && !updatedSizeViaScaling)
+                        if (changedSize && !updatedSizeViaScaling && !_popup)
                             Resized?.Invoke(ClientSize);
 
                         Dispatcher.UIThread.RunJobs(DispatcherPriority.Layout);