From ff90032aa5e8e943c1934d5a225243be5f1aee53 Mon Sep 17 00:00:00 2001
From: zeertzjq <zeertzjq@outlook.com>
Date: Mon, 8 Dec 2025 08:10:22 +0800
Subject: [PATCH] vim-patch:9.1.1961: :0tab behaves like :tab for :stag when
 'swb' contains "newtab"

Problem:  :0tab behaves like :tab for :stag when 'switchbuf' contains
          "newtab" (after 9.1.1949).
Solution: Don't override cmod_tab if it's already non-zero (zeertzjq).

closes: vim/vim#18859

https://github.com/vim/vim/commit/2b3566d89eeb3f84dad7715fff153b84177e5fbb
---
 src/nvim/tag.c                    | 2 +-
 test/old/testdir/test_tagjump.vim | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/nvim/tag.c b/src/nvim/tag.c
index 36209a8db9..987d48c74a 100644
--- a/src/nvim/tag.c
+++ b/src/nvim/tag.c
@@ -2869,7 +2869,7 @@ static int jumpto_tag(const char *lbuf_arg, int forceit, bool keep_help)
       cmdmod.cmod_split |= WSP_VERT;
     }
 
-    if (swb_flags & kOptSwbFlagNewtab) {
+    if ((swb_flags & kOptSwbFlagNewtab) && cmdmod.cmod_tab == 0) {
       // If 'switchbuf' contains 'newtab', then use a new tabpage
       cmdmod.cmod_tab = tabpage_index(curtab) + 1;
     }
diff --git a/test/old/testdir/test_tagjump.vim b/test/old/testdir/test_tagjump.vim
index 15f5932f96..df9f7060fa 100644
--- a/test/old/testdir/test_tagjump.vim
+++ b/test/old/testdir/test_tagjump.vim
@@ -163,7 +163,12 @@ func Test_tagjump_switchbuf()
   call assert_equal(2, tabpagenr('$'))
   call assert_equal(2, tabpagenr())
   call assert_equal(2, line('.'))
+  0tab stag third
+  call assert_equal(3, tabpagenr('$'))
+  call assert_equal(1, tabpagenr())
+  call assert_equal(3, line('.'))
 
+  tabclose!
   tabclose!
   enew | only
   set tags&