[PATCH 0/9] make stash apply with --index by default

Since git-stash's inception, it has defaulted to stashing the index but not restoring it. This has caused some confusion: change the default as part of Git 3.0 to unstash the index, too.

I ran into this myself a while back and did some digging; it appears that other have been bit, too (see references in patch 3). Moreover, when git-stash was originally written, defaulting with --index was suggested but not implemented before the script merged. So this RFC should bring us back towards "less confusing," hopefully.

The series is structured as follows:

Patches 1-2: unrelated prep/style commits noticed while working on tests.
Patch 3: update Documentation/BreakingChanges.adoc. This seems like a natural
    place to discuss the proposal, so it contains no other changes.
Patch 4: make it so in builtin/stash.c.
Patches 5-9: update the impacted tests. Separated out for ease of review. I used
    a style more like "split the test into 2: one with, one without breaking
    changes." In retrospect, the diff might be smaller (and the 2 versions of
    the test easier to compare) if I used "test_has_prereq" in the tests… but at
    the cost of making the tests harder to follow. Thoughts?

D. Ben Knoble (9):
  t3903: reduce dependencies on previous tests
  t3905: remove unneeded blank line
  BreakingChanges: announce stash {apply,pop} will imply --index
  stash: restore the index by default when breaking changes are enabled
  t0450: mark stash documentation as a known discrepancy
  t3903: adjust stash test to account for --[no-]index with breaking
    changes
  t3904: adjust stash -p test to account for index states with breaking
    changes
  t3905: adjust stash -u tests for breaking changes
  t3906: adjust stash submodule tests to account for breaking changes

 Documentation/BreakingChanges.adoc |  11 ++
 Documentation/git-stash.adoc       |   6 ++
 builtin/stash.c                    |  38 +++++++
 t/lib-submodule-update.sh          |  24 ++++-
 t/t0450/adoc-help-mismatches       |   1 +
 t/t3903-stash.sh                   | 161 +++++++++++++++++++++++++++--
 t/t3904-stash-patch.sh             |  14 ++-
 t/t3905-stash-include-untracked.sh |  40 ++++++-
 8 files changed, 276 insertions(+), 19 deletions(-)

base-commit: 1ee85f0e215f22b0878d0ad4b2445d12bbb63887