From dff97e65eb1bb24c44c2b7430a480888d8afb3f4 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Mon, 24 Jan 2022 20:00:55 +0000
Subject: patch 8.2.4208: using setbufvar() may change the window title

Problem:    Using setbufvar() may change the window title.
Solution:   Do not redraw when creating the autocommand window. (closes #9613)
---
 src/autocmd.c                  |  3 +++
 src/testdir/test_functions.vim | 23 ++++++++++++++++++++++-
 src/version.c                  |  2 ++
 3 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/src/autocmd.c b/src/autocmd.c
index 37f2480a88..a10be9b928 100644
--- a/src/autocmd.c
+++ b/src/autocmd.c
@@ -1518,7 +1518,10 @@ aucmd_prepbuf(
 	p_acd = FALSE;
 #endif
 
+	// no redrawing and don't set the window title
+	++RedrawingDisabled;
 	(void)win_split_ins(0, WSP_TOP, aucmd_win, 0);
+	--RedrawingDisabled;
 	(void)win_comp_pos();   // recompute window positions
 	p_ea = save_ea;
 #ifdef FEAT_AUTOCHDIR
diff --git a/src/testdir/test_functions.vim b/src/testdir/test_functions.vim
index 156a75277a..3f197ca3d3 100644
--- a/src/testdir/test_functions.vim
+++ b/src/testdir/test_functions.vim
@@ -1630,6 +1630,28 @@ func Test_setbufvar_options()
   bwipe!
 endfunc
 
+func Test_setbufvar_keep_window_title()
+  CheckRunVimInTerminal
+
+  let lines =<< trim END
+      edit Xa.txt
+      let g:buf = bufadd('Xb.txt')
+      inoremap <F2> <C-R>=setbufvar(g:buf, '&autoindent', 1) ?? ''<CR>
+  END
+  call writefile(lines, 'Xsetbufvar')
+  let buf = RunVimInTerminal('-S Xsetbufvar', {})
+  call assert_match('Xa.txt', term_gettitle(buf))
+
+  call term_sendkeys(buf, "i\<F2>")
+  call TermWait(buf)
+  call term_sendkeys(buf, "\<Esc>")
+  call TermWait(buf)
+  call assert_match('Xa.txt', term_gettitle(buf))
+
+  call StopVimInTerminal(buf)
+  call delete('Xsetbufvar')
+endfunc
+
 func Test_redo_in_nested_functions()
   nnoremap g. :set opfunc=Operator<CR>g@
   function Operator( type, ... )
@@ -2308,7 +2330,6 @@ endfunc
 
 func Test_state()
   CheckRunVimInTerminal
-  let g:test_is_flaky = 1
 
   let getstate = ":echo 'state: ' .. g:state .. '; mode: ' .. g:mode\<CR>"
 
diff --git a/src/version.c b/src/version.c
index 6703e8fafe..3b7cddd9f2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4208,
 /**/
     4207,
 /**/
-- 
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