Re: [PATCH v2 1/4] t4059: test 'diff --cc' with a change from only few parents

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On Sat, Apr 11, 2015 at 2:07 PM, Junio C Hamano <gitster@xxxxxxxxx> wrote:
> Especially, we need to pay close attention to the discussion that
> germinated the current behaviour:
>
>   http://thread.gmane.org/gmane.comp.version-control.git/15486/focus=15519
>
> I recall that the "diff --cc" before that change was not discarding
> uninteresting merges sufficiently and the two commits were a
> deliberate attempt to reject what your series wants to show as
> uninteresting hunks.
>
> Two suggestions.
>
>  - This is primarily for 2/4, but can we make it more clear in the

Eh, sorry, I obviously meant 3/4. And let me half-retract this suggestion
and put it on hold; the code-flow has become sufficiently different that
special-casing two-way merge may not be worth it after all.

>    code that we do this "include more" change only on Octopus
>    merges?  This change should not make any difference for two-way
>    merges and I'd prefer to avoid extra processing of finding
>    matching hunks and combining, only to discard the result.
>
>  - Can you run "diff --cc" with and without your patches to the
>    "merge from hell" commit mentioned in the original thread and see
>    if we show more hunks with your patches, and make sure what are
>    shown additionally looked really "interesting"?

This one still stands. We'd be interested to see what difference this
makes in the real world project history.

Thanks.
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