exmh: richtext quoting broken

i've packaged exmh 2.7.0 for debian and in the process of cleaning
up the mess left by the original maintainer, i've come across a couple
of old bug reports by debian uses which are still applicable.

the richtext problem is documented here: <URL:http://bugs.debian.org/175193>

in short: rich-texting a document that includes anything looking
like "<tag>" generates a broken document, as the opening "<" is not
quoted like rfc 1896 says (by doubling the "<").

fix? the problem seems a bit non-trivial to me and at the moment i can't 
offer anything ready-made, but here's a few ideas that might lead somebody 
with some time to spare to a solution:

* if sedit doesn't keep track of its own richtext tags versus text the user
entered, then there is no foolproof way of escaping things at the end before
sending: how to distinguish the user's to-be-escaped material from sedit's
legitimate tags? even if you look for unknown tags, then nothing keeps 
the user from messing things up with an unmatched <bigger> somewhere.

* if sedit keeps track of insertion, then normal user input could be 
simply run through the tcl equivalent of s/</<</g.
but looking at the code, i don't see any provisions for such complex state
keeping :-/

* maybe this could be a low-tech solution: everytime the user enters 
hits the "<" key in enriched mode, sedit silently expands it to "<<" and
shows only the original single "<".
if enriched mode is entered late during composition of an email, sedit could
run the quoting substitution on the whole body when switching.

regards
az

-- 
+ Alexander Zangerl + DSA 42BD645D + (RSA 5B586291)
"symlinks ... the goto of the file system world."  -- David Tilbrook

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