patch 7.4.1740
Problem: syn-cchar defined with matchadd() does not appear if there are no
other syntax definitions which matches buffer text.
Solution: Check for startcol. (Ozaki Kiichi, haya14busa, closes #757)
diff --git a/src/testdir/test_undolevels.vim b/src/testdir/test_undolevels.vim
index 7bb25ef..b96b693 100644
--- a/src/testdir/test_undolevels.vim
+++ b/src/testdir/test_undolevels.vim
@@ -41,4 +41,8 @@
call assert_equal(50, &g:undolevels)
call assert_equal(-123456, &l:undolevels)
+ " Drop created windows
+ set ul&
+ new
+ only!
endfunc