[PATCH v6 00/11] Untracked cache improvements

Here is a new version of a patch series to improve the untracked cache feature.

This v6 implements core.untrackedCache as a tristate config variable. When it's `true`, Git commands, especially `git status`, should always add the untracked cache and use it, and when `false`, Git commands should remove it. The default is `keep` in which case the untracked cache is neither removed nor added, and used if it is there.

Patch 1/11 is a small bugfix that has not changed.

Patch 2/11 to 4/11 add some small features that are missing. There are no changes since v5.

Patchs 5/11 to 7/11 are some refactoring to prepare for the following patchs. Also no changes here.

Patch 8/11 deals with the "ident" field in "struct untracked_cache". I rewrote a bit the commit message following some of Torsten's suggestions.

Patch 9/11 adds core.untrackedCache and only has commit message changes and a bit of document changes thanks to Junio compared to v5.

Patch 10/11 is a hack that is needed to have test-dump-untracked-cache work like it used to. I added some comments in the code following Junio's suggestion.

Patch 11/11, which contains tests, has been changed to improve the name of a file that contains the expected output.

So the changes compared to v5 are mostly small updates.

The patch series is also available there:

https://github.com/chriscool/git/tree/uc-notifs65

Thanks to the reviewers and helpers.

Christian Couder (11):
  dir: free untracked cache when removing it
  update-index: use enum for untracked cache options
  update-index: add --test-untracked-cache
  update-index: add untracked cache notifications
  update-index: move 'uc' var declaration
  dir: add {new,add}_untracked_cache()
  dir: add remove_untracked_cache()
  dir: simplify untracked cache "ident" field
  config: add core.untrackedCache
  test-dump-untracked-cache: don't modify the untracked cache
  t7063: add tests for core.untrackedCache

 Documentation/config.txt               |  9 ++++
 Documentation/git-update-index.txt     | 67 +++++++++++++++++++++----
 builtin/update-index.c                 | 62 ++++++++++++++---------
 cache.h                                |  8 +++
 config.c                               | 24 +++++++++
 contrib/completion/git-completion.bash |  1 +
 dir.c                                  | 62 ++++++++++++++++++-----
 dir.h                                  |  3 +-
 environment.c                          |  7 +++
 read-cache.c                           | 14 ++++++
 t/t7063-status-untracked-cache.sh      | 89 +++++++++++++++++++++++++++++++---
 test-dump-untracked-cache.c            |  4 ++
 12 files changed, 296 insertions(+), 54 deletions(-)