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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Redisplay bug
Date: Mon, 26 Aug 2002 15:51:10 -0600 (MDT)
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    I think when point enters a partially visible line, redisplay should 
    behave as if that line were invisible, i.e. scroll the display (by 
    default, by half the window height) to bring the point's line into the 
    visible area.

Yes, that is what I was trying to do.