patch 9.1.0272: autocmd may change cwd after :tcd and :lcd

Problem:  Autocommand may change currect directory after :tcd and :lcd.
Solution: Also clear tp_localdir and w_localdir when using aucmd_win.
          (zeertzjq)

closes: #14435

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_autocmd.vim b/src/testdir/test_autocmd.vim
index 50fdc41..c7d2534 100644
--- a/src/testdir/test_autocmd.vim
+++ b/src/testdir/test_autocmd.vim
@@ -3727,6 +3727,49 @@
   call assert_false(bufexists('Xb.txt'))
 endfunc
 
+" Test that using the autocommand window doesn't change current directory.
+func Test_autocmd_window_cwd()
+  let saveddir = getcwd()
+  call mkdir('Xcwd/a/b/c/d', 'pR')
+
+  new Xa.txt
+  tabnew
+  new Xb.txt
+
+  tabprev
+  cd Xcwd
+  call assert_match('/Xcwd$', getcwd())
+  call assert_match('\[global\] .*/Xcwd$', trim(execute('verbose pwd')))
+
+  autocmd BufEnter Xb.txt lcd ./a/b/c/d
+  doautoall BufEnter
+  au! BufEnter
+  call assert_match('/Xcwd$', getcwd())
+  call assert_match('\[global\] .*/Xcwd$', trim(execute('verbose pwd')))
+
+  tabnext
+  cd ./a
+  tcd ./b
+  lcd ./c
+  call assert_match('/Xcwd/a/b/c$', getcwd())
+  call assert_match('\[window\] .*/Xcwd/a/b/c$', trim(execute('verbose pwd')))
+
+  autocmd BufEnter Xa.txt call assert_match('Xcwd/a/b/c$', getcwd())
+  doautoall BufEnter
+  au! BufEnter
+  call assert_match('/Xcwd/a/b/c$', getcwd())
+  call assert_match('\[window\] .*/Xcwd/a/b/c$', trim(execute('verbose pwd')))
+  bwipe!
+  call assert_match('/Xcwd/a/b$', getcwd())
+  call assert_match('\[tabpage\] .*/Xcwd/a/b$', trim(execute('verbose pwd')))
+  bwipe!
+  call assert_match('/Xcwd/a$', getcwd())
+  call assert_match('\[global\] .*/Xcwd/a$', trim(execute('verbose pwd')))
+  bwipe!
+
+  call chdir(saveddir)
+endfunc
+
 func Test_bufwipeout_changes_window()
   " This should not crash, but we don't have any expectations about what
   " happens, changing window in BufWipeout has unpredictable results.