master 2207f9a: src/nsterm.m: fix window tabbing on macOS

[Alan Third]

branch: master
commit 2207f9adccc0411b7ad73a3703f16250d7f8e139
Author: Paul W. Rankin <pwr@bydasein.com>
Commit: Alan Third <alan@idiocy.org>

    src/nsterm.m: fix window tabbing on macOS
    
    * src/nsterm.m: remove NSWindowTabbingModeDisallowed to respect
      system-wide preferences
    * etc/NEWS: add mention of native tab support in macOS and where
      to specify system-wide setting
---
 etc/NEWS     | 8 ++++++++
 src/nsterm.m | 8 --------
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/etc/NEWS b/etc/NEWS
index 7d53eaf..57e52e2 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -3217,6 +3217,14 @@ The new variable 'xwidget-webkit-download-dir' says 
where to download to.
 ".so" suffix is supported as well.
 
 +++
+** On macOS, Emacs now supports native tabs (in macOS 10.12 and later).
+Native tabbing behavior is specified system-wide via System
+Preferences, under under General > 'Prefer tabs when opening
+documents'. In macOS versions 10.15 and earlier, this option is
+located under Dock instead. Note that this feature is unrelated to the
+Emacs 'tab-bar-mode'.
+
++++
 ** On MS-Windows, Emacs can now toggle the IME.
 A new function 'w32-set-ime-open-status' can now be used to disable
 and enable the MS-Windows native Input Method Editor (IME) at run
diff --git a/src/nsterm.m b/src/nsterm.m
index f616824..11b02f1 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -7628,14 +7628,6 @@ not_in_argv (NSString *arg)
          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.  */
-#ifdef NS_IMPL_COCOA
-  if ([win respondsToSelector: @selector(setTabbingMode:)])
-    [win setTabbingMode: NSWindowTabbingModeDisallowed];
-#endif
-
   ns_window_num++;
   return self;
 }