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Re: [Git] recursive merge on 'master' severely broken?

On Wed, Apr 11, 2018 at 12:19 AM, Junio C Hamano <gitster@xxxxxxxxx> wrote:
> It appears that a topic recently graduated to 'master' introduces a
> severe regression to "git merge" when it merges a side branch that
> renames paths while the trunk has further updates.
> The symptom can easily be seen by trying to recreate the merge I
> made at the tip of 'pu' 29dea678 ("Merge branch
> 'sb/filenames-with-dashes' into pu", 2018-04-11) that I'll be.
> pushing out shortly.  The side branch renames a file exec_cmd.h to
> exec-cmd.h (an underscore changed to a dash) without changing any
> contents, while the branch being merged to has made some changes to
> the contents while keeping the original pathname.
> A clean automerged result should leave the identical contents from
> HEAD:exec_cmd.h in :exec-cmd.h in the index, which is what happens
> when using Git v2.17.0 proper, but with today's master', there are
> content changes that cannot be explained--the merge is simply broken
> and worse yet, the command pretends that everything went well and
> merged cleanly in that path.  Overly clever tool that behaves in a
> buggy and unexplainable way is bad enough, doing so silently is
> unexcusable.

I agree, that is _really_ bad.  My sincerest apologies.  I'll dig into it.