Thread.Sleep should be done before the assert in WindowOrder_Modal_Dialog_Stays_InFront_Of_Parent

tests/Avalonia.IntegrationTests.Appium/WindowTests_MacOS.cs

@@ -25,10 +25,10 @@ namespace Avalonia.IntegrationTests.Appium
             {
                 mainWindow.Click();
 
-                var secondaryWindowIndex = GetWindowOrder("SecondaryWindow");
-
                 Thread.Sleep(300); // sync with timer
 
+                var secondaryWindowIndex = GetWindowOrder("SecondaryWindow");
+
                 Assert.Equal(1, secondaryWindowIndex);
             }
         }