bug (and possible fix): truncating lines in some groups but not others

[RL <richard.lewis.debian@googlemail.com>]

Hi all,

I was trying to set truncate-lines to t in some groups and nil in
others.

In gnus-art.el the docstring for gnus-article-truncate-lines says

 'Valid values are nil, t, `head', `first', `last', an integer or a
  predicate.'

which led me to think this would work:

(setq gnus-article-truncate-lines '("group1" "group2"))

but this turns on truncate-lines in all groups, not just group1 and group2.

I think that the issue is that gnus-article-truncate-lines is only
actually allowed to be nil or non-nil, ie:

- the docstring for gnus-article-truncate-lines is wrong
- there should be a new variable gnus-treat-truncate-lines
    (defined like gnus-treat-fill-long-lines )
- there should be a new function gnus-article-truncate-long-lines that
     simply does: (setq truncate-lines t)
     (or should that be  gnus-article-truncate-lines? - i dont
      understand why the latter is defined at all: truncate-lines is
      already buffer-local)
- gnus-treatment-function-alist should contain an element
    (gnus-treat-truncate-lines gnus-article-truncate-long-lines)

am i misunderstanding?