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From: ShengHuo ZHU <zsh@cs.rochester.edu>
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Subject: Re: [gnu.emacs.gnus] Re: Group parameters and gnus-boring-article-headers
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Kai.Grossjohann@CS.Uni-Dortmund.DE (Kai Großjohann) writes:

> What do you guys (and gals?) think about the following patch by Tony?
> I think it is the right thing to do.

Because Gnus may dynamically bind some variables (maybe local
variables in the summary buffer) then switch to the article buffer,
cloning local variables in the article buffer may cause some problems.
The following example illustrates this kind of problems.  In the
article buffer, it still uses the local value, "Article", instead of
the dynamic one, "Dynamic".

    (let (art-buf sum-buf msg)
      (with-temp-buffer
        (setq art-buf (current-buffer))
        (set (make-local-variable 'info) "Article")
        (with-temp-buffer
          (setq sum-buf (current-buffer))
          (set (make-local-variable 'info) "Summary")
          (let ((info "Dynamic"))
            (set-buffer art-buf)
            (setq msg info))
          (set-buffer sum-buf)
          (setq msg (concat msg "; " info))))
      msg)

As an alternative solution, I've installed a patch which enables users
explicitly specify which summary-buffer-local variables should be
globalized (see `gnus-newsgroup-variables'), so that the values could
be used in the article buffer.

ShengHuo