[PATCH v2 00/10] Untracked cache improvements

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

This v2 still implements core.untrackedCache as a simple bool config variable. When it's true, Git should always try to use the untracked cache, and when false, Git should never use it.

Patchs 1/10 to 3/10 add some features that are missing. Patch 3/10 has been moved after the two other patches and has been changed a bit according to Duy's and Junio's suggestions. In patch 2/10 the enum names have been changed as discussed with Junio.

Patchs 4/10, 5/10 and 6/10, which have not been changed, are some refactoring to prepare for patch 8/10 which implements core.untrackedCache.

Patch 7/10 is a small bug fix suggested by Junio.

Patch 8/10, which adds core.untrackedCache, contains many documentation and commit message improvements, some by AEvar.

Patch 9/10 has not been changed.

Patch 10/10 is new and removes code that is now useless.

So the changes compared to v1 are mostly small updates, and patchs 7/10 and 10/10.

The patch series is also available there:

https://github.com/chriscool/git/tree/uc-notifs25

Thanks to the reviewers and helpers.

Christian Couder (10):
  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 add_untracked_cache()
  dir: add remove_untracked_cache()
  dir: free untracked cache when removing it
  config: add core.untrackedCache
  t7063: add tests for core.untrackedCache
  dir: do not use untracked cache ident anymore

 Documentation/config.txt               |  7 ++++
 Documentation/git-update-index.txt     | 61 ++++++++++++++++++++++++++++------
 builtin/update-index.c                 | 54 +++++++++++++++++-------------
 cache.h                                |  1 +
 config.c                               |  4 +++
 contrib/completion/git-completion.bash |  1 +
 dir.c                                  | 53 +++++++++++++----------------
 dir.h                                  |  4 ++-
 environment.c                          |  1 +
 t/t7063-status-untracked-cache.sh      | 52 ++++++++++++++++++++++++++---
 wt-status.c                            |  9 +++++
 11 files changed, 178 insertions(+), 69 deletions(-)