S D r: bad interaction with TM and/or SEMI

[Kai Grossjohann <grossjohann@charly.cs.uni-dortmund.de>]

In all versions of TM and SEMI that I've used recently, I've had
problems with S D r.  The symptom now (Gnus 5.5, SEMI 0.X) is that I
get "wrong type argument: keymapp nil" the first time I do S D r and
"Already editing MIME message" the second time.

I venture to guess that this is because Gnus sets up a message buffer
for the resend, complete with all hooks.  But there is really no sense
in running the MIME editing setup hook -- either the message is
already MIME-ified, in which case the hook shouldn't run, or it isn't,
in which case the hook shouldn't run, either.

I suggest that message-setup-hook (and similar hooks) be temporarily
set to nil when setting up a message buffer for S D r.

S D b works fine, btw.

kai
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