Merge pull request #12725 from Actipro/fix-popup-offset

Fix popups in Windows being offset incorrectly by a workaround for another issue

src/Windows/Avalonia.Win32/WindowImpl.cs

@@ -552,7 +552,7 @@ namespace Avalonia.Win32
             get
             {
                 // Windows 10 and 11 add a 7 pixel invisible border on the left/right/bottom of windows for resizing
-                if (Win32Platform.WindowsVersion.Major < 10 || !HasFullDecorations)
+                if (Win32Platform.WindowsVersion.Major < 10 || !HasFullDecorations || GetStyle().HasFlag(WindowStyles.WS_POPUP))
                 {
                     return PixelSize.Empty;
                 }