From 91d2e783b41ca900bc603b3cb5e083c8a4a33170 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Tue, 7 Aug 2018 19:05:01 +0200
Subject: patch 8.1.0245: calling setline() in TextChangedI autocmd breaks undo

Problem:    Calling setline() in TextChangedI autocmd breaks undo. (Jason
            Felice)
Solution:   Don't save lines for undo when already saved. (closes #3291)
---
 src/testdir/test_autocmd.vim | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

(limited to 'src/testdir/test_autocmd.vim')

diff --git a/src/testdir/test_autocmd.vim b/src/testdir/test_autocmd.vim
index 19c54d156..b52493fcb 100644
--- a/src/testdir/test_autocmd.vim
+++ b/src/testdir/test_autocmd.vim
@@ -587,7 +587,7 @@ func Test_OptionSet()
   " Cleanup
   au! OptionSet
   for opt in ['nu', 'ai', 'acd', 'ar', 'bs', 'backup', 'cul', 'cp']
-    exe printf(":set %s&vi", opt)
+    exe printf(":set %s&vim", opt)
   endfor
   call test_override('starting', 0)
   delfunc! AutoCommandOptionSet
@@ -1313,6 +1313,31 @@ func Test_ChangedP()
   bw!
 endfunc
 
+let g:setline_handled = v:false
+func! SetLineOne()
+  if !g:setline_handled
+    call setline(1, "(x)")
+    let g:setline_handled = v:true
+  endif
+endfunc
+
+func Test_TextChangedI_with_setline()
+  new
+  call test_override('char_avail', 1)
+  autocmd TextChangedI <buffer> call SetLineOne()
+  call feedkeys("i(\<CR>\<Esc>", 'tx')
+  call assert_equal('(', getline(1))
+  call assert_equal('x)', getline(2))
+  undo
+  call assert_equal('(', getline(1))
+  call assert_equal('', getline(2))
+  undo
+  call assert_equal('', getline(1))
+
+  call test_override('starting', 0)
+  bwipe!
+endfunc
+
 func Test_Changed_FirstTime()
   if !has('terminal') || has('gui_running')
     return
-- 
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