[PATCH 1 of 3 STABLE] diffhelpers: backport 9e40bc4c1bde from C implementation

[Pulkit Goyal]

On Fri, Apr 20, 2018 at 5:40 PM, Yuya Nishihara <yuya at tcha.org> wrote:

> # HG changeset patch
> # User Yuya Nishihara <yuya at tcha.org>
> # Date 1524148397 -32400
> #      Thu Apr 19 23:33:17 2018 +0900
> # Branch stable
> # Node ID 171c91d2e6fb2ce686d24b34da5cc81482e0223d
> # Parent  62053dbefda333714d285dbd2274067864186e19
> diffhelpers: backport 9e40bc4c1bde from C implementation
>
> 9e40bc4c1bde just says "harden testhunk." I don't think this would be
> the case, but it makes some sense to avoid negative index.
>

​Queued the series for stable. Many thanks, especially for the check-code
rule.​
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