>> > > What about the following docstring? It should correctly document what
>> > > this function does.
>> >
>> > Why require mark to abe active?
>>
>> Actually, it doesn't require mark to be active. When mark is not active,
>> it uses the revision at point.
> I mean:
> Why require mark to be active to diff between two specified revisions?
Because it's very convenient to be able to do a diff between rev N and
current (rather between rev N1 and N2) without having to set the
mark locally.
Stefan
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