Unicode control characters

[Edmund GRIMLEY EVANS <edmundo@rano.demon.co.uk>]

All this talk of zero-width spaces, paragraph separators and the like
has got me worried. I suppose I had always assumed that all Unicode
characters, apart from 0..0x1f and 0x7f..0x9f, would be printable,
because things like paragraphs would be indicated with XML mark-up or
some other means outside the character set. How wrong I was.

So, what are the main things I have to worry about for my MUA (mutt)
and curses-compatible library (slang)? Which Unicode control
characters ought I to interpret, and how can I recognise the others
(so that I can ignore them or convert them to hex or whatever)?

By the way, I noticed that the vertical line down the right-hand side
of Markus's UTF-8-test.txt seems to assume that U-00000080 has wcwidth
of 1. My xterm displays it as an empty box, one cell wide, but my MUA
converts it to hex, and Emacs in UTF-8 mode won't allow it at all.

Edmund
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