From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH] send-email: detect and offer to skip backup files
Date: Tue, 12 Apr 2016 18:38:13 -0700
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	<CAGZ79kZ+_JW-5BWdXse++_KaATO+qDhNtTz_k5gX507sObZyzA@mail.gmail.com>
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To: Stefan Beller <sbeller@google.com>
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In-Reply-To: <CAGZ79kZ+_JW-5BWdXse++_KaATO+qDhNtTz_k5gX507sObZyzA@mail.gmail.com>
	(Stefan Beller's message of "Tue, 12 Apr 2016 16:05:21 -0700")
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Stefan Beller <sbeller@google.com> writes:

> Once I made the mistake to not remove a previous patch series I had,
> such that there was:
>
>   0000-coverletter.patch (newly worded)
>   0001-bla-from-new-series
>   0001-foo-from-old-series
>   0002-...
>   ...
>
> `git send-email 0*` then sent out a totally bogus series for me.
>
> As another user friendly helper we could warn/abort if the first <n> characters
> are the same as the previous patch as well?

I think that would be one of the many things that can be built on
top.  For example, you could notice that all messages begin with
4-digit and a dash, and send such a set to a special case (where
patches having duplicated numbers are signalled as a potential
error).