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From: jasonr (Jason Rumney) @  f2s.com
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Subject: Re: fringe - how to use?
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"Joe Casadonte" <jcasadonte@northbound-train.com> writes:

> I was wondering if there is an API for putting stuff into the fringe
> via lisp?

Here is what edebug does. As far as I can see only one mark can be
there at a time, but this should give you somewhere to start looking
for more info from.


(defun arrow-in-fringe ()
  "Display an arrow on the current line."
  (interactive)
  (setq overlay-arrow-string "==>")
  (setq overlay-arrow-position (make-marker))
  (set-marker overlay-arrow-position 
              (line-beginning-position) (current-buffer)))