bug#2988: 23.0.92; Document 'ancestor' in ediff info

On 2009-04-14 03:10 +0100, Stefan Monnier wrote:
>> The concept 'ancestor' in ediff info is undocumented. My suspicion is
>> that it might be an outdated concept and there is a modern replacement.
>
> AFAIK, it's not outdated.  It's simply tied to the notion of 3-way diff,
> which you apparently don't know about.

I admit my ignorance in this. However the documentation does not even
provide a reference to facilitate users' understanding on this
particular subject.

>         Stefan

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