[PATCH 1 of 5] rebase: extract final changesets cleanup logic in a dedicated function

[Bryan O'Sullivan]

On Tue, Sep 18, 2012 at 2:58 PM, Bryan O'Sullivan <bos at serpentine.com>wrote:

> It's possible to do a little better in cases like this:
>

I pushed your change to crew, by the way, I wasn't asking for you to change
anything (especially since followup patches obsolete this).
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