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Re: [PATCH] xdiff: improve trimming preprocessing

Eric Sunshine <sunshine@xxxxxxxxxxxxxx> writes:

> On Tue, Mar 6, 2018 at 6:53 AM, Jun Wu <quark@xxxxxx> wrote:
>> xdiff-interface trims common suffix if ctxlen is 0. Teach it to also
>> trim common prefix, and trim less lines if ctxlen > 0. So it can benefit
>> the default diff command, as seen by profiling: [...]

I vaguely recall that we have tried this in the distant past, found
that it produced incorrect result, and that is why we limit the
optimization for no-context case.

Does anybody have an archive reference?