RE: compatibility problem of whitespace-mode & PrettyControlL?

[Drew Adams]

> there seems to be a compatibility problem with whitespace-mode and
> both http://user42.tuxfamily.org/formfeed-hline/index.html and
> http://www.emacswiki.org/emacs/PrettyControlL
> in short, when one of PrettyControlL or formfeed-hline-mode is loaded,
> then the unicode in whitespace-mode disappears.
...
> it seems when pretty print is loaded, all those triangle and
> middle dot doesn't show. same problem happens with formfeed-hline.
> any idea what's going on?

I replied to your question on Emacs Wiki
(http://www.emacswiki.org/emacs/PrettyControlL).  I don't know what causes the
problem, but I can confirm it.  Perhaps someone else can help?  Sorry.