From 96fc7c150f0db6f7eaed3fc4e731210d64581eb8 Mon Sep 17 00:00:00 2001
From: luukvbaal <luukvbaal@gmail.com>
Date: Mon, 11 May 2026 21:54:55 +0200
Subject: [PATCH] fix(api): don't update 'title' when renaming non-curbuf
 #39743

Problem:  'title' is updated when changing the name of a non-current
          buffer with nvim_buf_set_name().
Solution: Set RedrawingDisabled when renaming the buffer.
---
 src/nvim/api/buffer.c             | 4 +++-
 test/functional/ui/title_spec.lua | 8 ++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/nvim/api/buffer.c b/src/nvim/api/buffer.c
index 28f30030d5..e62fd0e401 100644
--- a/src/nvim/api/buffer.c
+++ b/src/nvim/api/buffer.c
@@ -965,7 +965,8 @@ void nvim_buf_set_name(Buffer buf, String name, Error *err)
     const bool is_curbuf = b == curbuf;
     const int save_acd = p_acd;
     if (!is_curbuf) {
-      // Temporarily disable 'autochdir' when setting file name for another buffer.
+      // Don't update 'title' and 'autochdir' when setting file name for another buffer.
+      RedrawingDisabled++;
       p_acd = false;
     }
 
@@ -976,6 +977,7 @@ void nvim_buf_set_name(Buffer buf, String name, Error *err)
     aucmd_restbuf(&aco);
 
     if (!is_curbuf) {
+      RedrawingDisabled--;
       p_acd = save_acd;
     }
   });
diff --git a/test/functional/ui/title_spec.lua b/test/functional/ui/title_spec.lua
index 37db486abd..876919d43c 100644
--- a/test/functional/ui/title_spec.lua
+++ b/test/functional/ui/title_spec.lua
@@ -232,5 +232,13 @@ describe('title', function()
         eq(expected, screen.title)
       end)
     end)
+
+    it('changing name of non-current buffer', function()
+      api.nvim_buf_set_name(buf2, 'foo')
+      command('redraw!')
+      screen:expect(function()
+        eq(expected, screen.title)
+      end)
+    end)
   end)
 end)