Window split didn't copy the value of 'conceallevel'.
diff --git a/runtime/doc/todo.txt b/runtime/doc/todo.txt
index 3fd8132..0a7337d 100644
--- a/runtime/doc/todo.txt
+++ b/runtime/doc/todo.txt
@@ -30,13 +30,7 @@
*known-bugs*
-------------------- Known bugs and current work -----------------------
-a |test| and a |test| and a |test|.
-Conceal in help files doesn't work nice. How about adding a 'concealcursor'
-option:
--> implemented, but column isn't quite right just after concealed character.
-- Don't conceal in Insert and Visual mode? Or make 'concealcursor' a string
- option with mode characters.
-- Check position in wrapped line.
+Check position in wrapped line with 'concealcursor' set.
Trick with syntax ID works, but it's not nice. Can we give a sequence nr to
syntax item matches? At least the ones with a replacement char.