Date: Thu, 11 Feb 2010 23:32:21 +0100 (CET)
From: racin@free.fr
To: micah anderson <micah@riseup.net>
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Cc: notmuch@notmuchmail.org
Subject: Re: [notmuch] notmuch.el: Prefix arg inverts the sort order of
 notmuch-search.
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>On Thu, 11 Feb 2010 15:20:54 +0100 (CET), racin@free.fr wrote:
>
>> Using a prefix arg to invert search order would conflict with my patch
>> http://notmuchmail.org/pipermail/notmuch/2009/000914.html in which the
>> prefix arg is used to show deleted messages. I don't known which
>> behaviour for prefix patch would be best.
>
>I always understood a prefix arg to invert the original (or provide a
>numeric repetition), but I do not have a wide sample to tell if this is
>how most elisp implements it. 

Gnus uses a C-u prefix to display old messages, for instance. 

Note that the only advantage of the prefix over the toggle is that it makes one call to notmuch search instead of one. I don't think that it matters from a performance point of view, as the second search is always much faster than the second. Maybe we should just reserve the prefix for a later use.