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[RFC PATCH v9 0/30] Add directory rename detection to git

This series builds on commit febb3a86098f ("merge-recursive: avoid
spurious rename/rename conflict from dir renames", 2018-02-14), also known
as patch 29/30 of en/rename-directory-detection.  That patch series has
been reverted from master[1], due to a bug with patch 30/30, so does not
apply to current master.  But I didn't want to resend the whole series for
an RFC.

These four patches replace that patch and:
  - fixes Linus' rewriting-of-unchanged-files bug[1]
  - fixes the problems that broke Junio's merges after my series[2]
  - fixes the problem the original patch 30/30 was intended to solve
  - adds lots of testcases to make sure this doesn't regress.

Linus' alternative of stupid-brute-force[3], would also work here,
though I feel the first three patches are useful even if we take some
form of his patch.  Long term, the most correct solution would involve
a rewrite to merge-recursive that would simplify this code[4], though
I think the changes in this series brings this part of the code closer
to that end state.

The big questions here are:
  1) The last time my rename-directory-detection series was merged into
     master it bit Junio badly.  I'm planning to redo all merges of
     git.git and linux.git and comparing v2.17.0 to what I get after
     my changes.  What else should I test?
  2) What do folks thing about stupid-brute-force vs. the explanation in
     my final patch?

[1] https://public-inbox.org/git/CA+55aFzLZ3UkG5svqZwSnhNk75=fXJRkvU1m_RHBG54NOoaZPA@xxxxxxxxxxxxxx/
[2] https://public-inbox.org/git/xmqqmuya43cs.fsf@xxxxxxxxxxxxxxxxxxxxxxxxx/
[3] https://public-inbox.org/git/CA+55aFwi9pTAJT_qtv=vHLgu=B1fdXBoD96i8Y5xnbS=zrfSzg@xxxxxxxxxxxxxx/
[4] https://public-inbox.org/git/xmqqd147kpdm.fsf@xxxxxxxxxxxxxxxxxxxxxxxxxxx/

Elijah Newren (4):
  merge-recursive: improve output precision around skipping updates
  t6046: testcases checking whether updates can be skipped in a merge
  merge-recursive: Fix was_tracked() to quit lying with some renamed
  merge-recursive: fix check for skipability of working tree updates

 merge-recursive.c                      | 109 +++++---
 merge-recursive.h                      |   1 +
 t/t6022-merge-rename.sh                |   2 +-
 t/t6043-merge-rename-directories.sh    |   2 +-
 t/t6046-merge-skip-unneeded-updates.sh | 497 +++++++++++++++++++++++++++++++++
 5 files changed, 575 insertions(+), 36 deletions(-)
 create mode 100755 t/t6046-merge-skip-unneeded-updates.sh