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From: Richard Stallman <rms@gnu.org>
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Subject: Re: A scrolling wish..
Date: Mon, 23 Sep 2002 23:23:29 -0400
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    If I programatically call (scroll-up 2), there seems to be no way to
    tell what the result of the operation was.  viz. whether we reached a
    max-scrolled-out [not same as eobp] condition, or whether the output
    succeeded.  (scroll-up) always returns nil.  

    Perhaps it could return something more useful?

Do you want to implement it and debug it?