can't scroll one line if only *Article* buffer showing

[jidanni@jidanni.org]

Normally to scroll an article just one line, one hits RET (gnus-summary-scroll-up).

However, after using
   h runs the command gnus-summary-select-article-buffer
   (with `gnus-widen-article-buffer' set, to show only the article buffer)

RET just gives
   widget-button-press: Buffer is read-only: #<buffer *Article gmane.linux.debian.user.news*>

Maybe one could say it is due to my
http://jidanni.org/comp/configuration/ using emacs-w3m or something.
However widget-button-press should be smart enough to know that when the
cursor is not upon a link it should just act like RET does in the
*Summary* buffer.

One would think that J (w3m-scroll-up-1) would do what we want, but we
find in gnus *Article* buffer that is not bound, which reveals another
bug: J, i, etc. unbound keys, when typed into the *Article* buffer,
cause it to fly back to the top of the article, instead of having the
article remain in place.

By the way, in pure emacs-w3m, if J is the way to scroll one line, why
is there no w3m-scroll-down-1 function/binding?

$ apt-show-versions emacs-snapshot w3m-el-snapshot
emacs-snapshot/sid uptodate 1:20101030-1
w3m-el-snapshot/unstable uptodate 1.4.400+0.20100725-1