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Re: Optimizing writes to unchanged files during merges?

On Thu, Apr 12, 2018 at 4:17 PM, Junio C Hamano <gitster@xxxxxxxxx> wrote:
> A bit of detour.  "Change in side branch happened to be a subset of
> the change in trunk and gets subsumed, but we end up writing the
> same result" happens also with the simpler resolve strategy.
> Here is a fix.

Heh. Except git-merge-one-file.sh is *only* used for that case, so
this doesn't fix the normal case.

I verified that the normal case situation is that
"update_file_flags()" thing that checks out the end result.

It's called by this case:

        } else if (a_oid && b_oid) {
                /* Case C: Added in both (check for same permissions) and */
                /* case D: Modified in both, but differently. */
                clean_merge = merge_content(o, path,
                                            o_oid, o_mode, a_oid,
a_mode, b_oid, b_mode,

in process_entry(), and I think  we could just there add a test for if
o_old,o_mod == a_oid,a_mode or something?