From a91fde7798f392ce56f3a359ecdb176c8630efbf Mon Sep 17 00:00:00 2001
From: Julien Lebosquain <julien@lebosquain.net>
Date: Thu, 19 Mar 2026 10:18:48 +0100
Subject: [PATCH] Allow CanResize on macOS in BorderOnly mode (#20940)

---
 native/Avalonia.Native/src/OSX/WindowImpl.mm | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/native/Avalonia.Native/src/OSX/WindowImpl.mm b/native/Avalonia.Native/src/OSX/WindowImpl.mm
index 1d77d3ce44..f42b7c27cb 100644
--- a/native/Avalonia.Native/src/OSX/WindowImpl.mm
+++ b/native/Avalonia.Native/src/OSX/WindowImpl.mm
@@ -563,6 +563,10 @@ NSWindowStyleMask WindowImpl::CalculateStyleMask() {
 
         case SystemDecorationsBorderOnly:
             s = s | NSWindowStyleMaskTitled | NSWindowStyleMaskFullSizeContentView;
+            
+            if (_canResize && _isEnabled) {
+                s = s | NSWindowStyleMaskResizable;
+            }
             break;
 
         case SystemDecorationsFull: