From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marco Wahl <marcowahlsoft@gmail.com>
Subject: Re: [PATCH] Use prefix arg to control scope of
 org-narrow-to-subtree.
Date: Mon, 02 Dec 2019 16:15:20 +0100
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Karl Fogel <kfogel@red-bean.com> writes:

> It allows you to choose what level subtree to narrow to.  There are
> two ways to specify the subtree: use repeated C-u's to select "upward"
> from the current subtree, or use a direct numeric prefix arg to
> specify the subtree "downward" from level 1.  (This is a somewhat
> unusual prefix argument usage, but it's useful to be able to choose
> from either direction, and the convenience of using C-u to select
> upward is quite enormous -- I expect it to be the common case, and
> it's pretty much the only way I use the feature.)
>
> The prefix arg is optional, of course: if you don't pass it, then
> `org-narrow-to-subtree' behaves the same way it has always behaved.

What about numeric prefix arg 0 to reveal the whole buffer (aka
'widen')?  I think this would be a logical completion to the feature.