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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: recenter-top-bottom
Date: Sat, 01 Dec 2007 18:41:03 -0500
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I set `scroll-conservatively' to a large value just so it will always
be bigger than the screen height.  This means, more or less, that if
Emacs can bring point onto the screen by scrolling, with even one line
of overlap with the old screen, it should do so.