patch 8.0.0330: illegal memory access after "vapo"

Problem:    Illegal memory access after "vapo". (Dominique Pelle)
Solution:   Fix the cursor column.
diff --git a/src/testdir/test_visual.vim b/src/testdir/test_visual.vim
index 8768395..9d093d3 100644
--- a/src/testdir/test_visual.vim
+++ b/src/testdir/test_visual.vim
@@ -36,3 +36,10 @@
   set tw&
   bw!
 endfu
+
+func Test_Visual_vapo()
+  new
+  normal oxx
+  normal vapo
+  bwipe!
+endfunc