I saw this in other editors and wondered if emacs can do something like
this. I found this page in the Emacs Wiki:
http://www.emacswiki.org/cgi-bin/wiki/MarginMode
The picture at the bottom shows what I'd like: a visual cue to avoid
writing too long lines (I know there's autofill). Unfortunately, this
requires XWEM and the other solutions only add faces to characters in the
buffers, so they don't actually draw a vertical line.
I think Emacs 21 can display graphics in a buffer, so I thought of
something like putting a graphics overlay onto the buffer text. Can it be
done with a standalone package (no XWEM)?
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