The changes are described in CHANGES.

Contributions-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Contributions-by: Stefan Tatschner <rumpelsepp@sevenbyte.org>
Contributions-by: Simon P <simon.git@le-huit.fr>
Contributions-by: Leander Hasty <leander@1stplayable.com>
Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

* pw/completion-stash:
  completion: fix mis-indentation in _git_stash()

Signed-off-by: SZEDER Gábor <szeder@ira.uka.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Update the untracked cache subsystem and change its primary UI from
"git update-index" to "git config".

* cc/untracked:
  t7063: add tests for core.untrackedCache
  test-dump-untracked-cache: don't modify the untracked cache
  config: add core.untrackedCache
  dir: simplify untracked cache "ident" field
  dir: add remove_untracked_cache()
  dir: add {new,add}_untracked_cache()
  update-index: move 'uc' var declaration
  update-index: add untracked cache notifications
  update-index: add --test-untracked-cache
  update-index: use enum for untracked cache options
  dir: free untracked cache when removing it

* pw/completion-stash:
  completion: update completion arguments for stash

* pw/completion-show-branch:
  completion: complete show-branch "--date-order"

* jk/completion-rebase:
  completion: add missing git-rebase options

The "split" subcommand of "git subtree" (in contrib/) incorrectly
skipped merges when it shouldn't, which was corrected.

* dw/subtree-split-do-not-drop-merge:
  contrib/subtree: fix "subtree split" skipped-merge bug

* tb/complete-word-diff-regex:
  completion: complete "diff --word-diff-regex="

* dg/subtree-test:
  contrib/subtree: Make testing easier