commit 95dbcbea6d85a5b79d9617ab3863458fdf0217a0
author Bram Moolenaar <Bram@vim.org> Sat Jan 27 21:01:34 2018 +0100
committer Bram Moolenaar <Bram@vim.org> Sat Jan 27 21:01:34 2018 +0100
tree 865904c3b8a00001192b1b3f870a9c2b01304063
parent 2ec364e94dbc080ccdf6c5dfc6f1653b5b7ded64

patch 8.0.1433: illegal memory access after undo

Problem:    Illegal memory access after undo. (Dominique Pelle)
Solution:   Avoid the column becomes negative. (Christian Brabandt,
            closes #2533)

src/testdir/test_undo.vim

diff --git a/src/testdir/test_undo.vim b/src/testdir/test_undo.vim
index 30164a6..b723586 100644
--- a/src/testdir/test_undo.vim
+++ b/src/testdir/test_undo.vim
@@ -350,3 +350,12 @@
   only!
   let @a=''
 endfunc
+
+" This used to cause an illegal memory access
+func Test_undo_append()
+  new
+  call feedkeys("axx\<Esc>v", 'xt')
+  undo
+  norm o
+  quit
+endfunc