src/nsterm.m: fix window tabbing on macOS

["Paul W. Rankin" via "Emacs development discussions." <emacs-devel@gnu.org>]

[-- Attachment #1: Type: text/plain, Size: 136 bytes --]

src/nsterm.m: use NSWindowTabbingModeAutomatic to respect user choice.
Tabbed window managers are now widely available for free systems.

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: 0001-src-nsterm.m-fix-window-tabbing-on-macOS.patch --]
[-- Type: text/x-diff; name=0001-src-nsterm.m-fix-window-tabbing-on-macOS.patch, Size: 1338 bytes --]

From 930d5ccfa2e8356e8daf8036f2487bb30a103893 Mon Sep 17 00:00:00 2001
From: "Paul W. Rankin" <pwr@bydasein.com>
Date: Sat, 8 May 2021 19:09:59 +1000
Subject: [PATCH] src/nsterm.m: fix window tabbing on macOS

* src/nsterm.m: use NSWindowTabbingModeAutomatic to respect user choice.
  Tabbed window managers are now widely available for free systems.
---
 src/nsterm.m | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/nsterm.m b/src/nsterm.m
index bb20886ab1..def1aec285 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -7628,12 +7628,12 @@ - (instancetype) initFrameFromEmacs: (struct frame *)f
          selector:@selector (viewDidResize:)
              name:NSViewFrameDidChangeNotification object:nil];
 
-  /* macOS Sierra automatically enables tabbed windows.  We can't
-     allow this to be enabled until it's available on a Free system.
-     Currently it only happens by accident and is buggy anyway.  */
+  /* macOS Sierra automatically enables tabbed windows.  Tabbed window
+     managers are now also widely available on free operating
+     systems. */
 #ifdef NS_IMPL_COCOA
   if ([win respondsToSelector: @selector(setTabbingMode:)])
-    [win setTabbingMode: NSWindowTabbingModeDisallowed];
+    [win setTabbingMode: NSWindowTabbingModeAutomatic];
 #endif
 
   ns_window_num++;
-- 
2.31.1