From 0ad00a7fd3e0389f565876521e395c35144d8009 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Sun, 22 May 2022 11:59:25 +0100
Subject: [PATCH] patch 8.2.4996: setbufline() may change Visual selection

Problem:    setbufline() may change Visual selection. (Qiming Zhao)
Solution:   Disable Visual mode when using another buffer. (closes #10466)
---
 src/evalbuffer.c             |  3 +++
 src/testdir/test_bufline.vim | 16 ++++++++++++++++
 src/version.c                |  2 ++
 3 files changed, 21 insertions(+)

diff --git a/src/evalbuffer.c b/src/evalbuffer.c
index 1b829848fb857..13f813ebd8cf7 100644
--- a/src/evalbuffer.c
+++ b/src/evalbuffer.c
@@ -144,6 +144,7 @@ set_buffer_lines(
     buf_T	*curbuf_save = NULL;
     win_T	*curwin_save = NULL;
     int		is_curbuf = buf == curbuf;
+    int		save_VIsual_active = VIsual_active;
 
     // When using the current buffer ml_mfp will be set if needed.  Useful when
     // setline() is used on startup.  For other buffers the buffer must be
@@ -158,6 +159,7 @@ set_buffer_lines(
 
     if (!is_curbuf)
     {
+	VIsual_active = FALSE;
 	curbuf_save = curbuf;
 	curwin_save = curwin;
 	curbuf = buf;
@@ -264,6 +266,7 @@ set_buffer_lines(
     {
 	curbuf = curbuf_save;
 	curwin = curwin_save;
+	VIsual_active = save_VIsual_active;
     }
 }
 
diff --git a/src/testdir/test_bufline.vim b/src/testdir/test_bufline.vim
index 3acf7c96cd872..d5b5d7ad848d0 100644
--- a/src/testdir/test_bufline.vim
+++ b/src/testdir/test_bufline.vim
@@ -222,4 +222,20 @@ func Test_appendbufline_redraw()
   call delete('XscriptMatchCommon')
 endfunc
 
+func Test_setbufline_select_mode()
+  new
+  call setline(1, ['foo', 'bar'])
+  call feedkeys("j^v2l\<C-G>", 'nx')
+
+  let bufnr = bufadd('Xdummy')
+  call bufload(bufnr)
+  call setbufline(bufnr, 1, ['abc'])
+
+  call feedkeys("x", 'nx')
+  call assert_equal(['foo', 'x'], getline(1, 2))
+
+  exe "bwipe! " .. bufnr
+  bwipe!
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index 1a39c062552e6..fdbb994a4f311 100644
--- a/src/version.c
+++ b/src/version.c
@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4996,
 /**/
     4995,
 /**/