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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: [PATCH] Add function eshell/clear to clear current eshell buffer
Date: Sun, 08 Mar 2015 22:11:38 +0200
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> From: vibhavp@gmail.com
> Cc: emacs-devel@gnu.org
> Date: Mon, 09 Mar 2015 00:58:12 +0530
> 
> > how about filling the window with blank
> > lines instead, so that the old contents are out of sight, but still
> > reachable?  Would that make sense?
> 
> Unfortunately, I don't know how to do that :(. Although, I think that
> can be done with getting the number of lines between (point-max) and the
> top of the window, and then inserting these many newlines.

Yes, exactly.  It shouldn't be hard.