[PATCH v4 0/6] Fix clean -d and status --ignored

Incorporates all of Junio's feedback on v4:

* squashes test expect_failure -> expect_success flips into the commits that
  fix them
* the O(n^2) pruning loop added for DIR_KEEP_UNTRACKED_CONTENTS is now O(n)
* the logic in cmd_clean() that keeps the contents of an untracked dir from the
  del_list is now hoisted into a separate loop

Also includes the following:

* expands the test I add in t7300 to check clean -d, for better coverage of the
  pruning logic in cmd_clean() (the logic that tells clean -d to not remove a/b
  and a/c if it's already removing a/)
* documents DIR_KEEP_UNTRACKED_CONTENTS in the corresponding technical API doc

Samuel Lijin (6):
  t7300: clean -d should skip dirs with ignored files
  t7061: status --ignored should search untracked dirs
  dir: recurse into untracked dirs for ignored files
  dir: hide untracked contents of untracked dirs
  dir: expose cmp_name() and check_contains()
  clean: teach clean -d to skip dirs containing ignored files

 Documentation/technical/api-directory-listing.txt |  6 ++++
 builtin/clean.c                                   | 38 +++++++++++++++++++-
 dir.c                                             | 42 ++++++++++++++++++++---
 dir.h                                             |  6 +++-
 t/t7061-wtstatus-ignore.sh                        |  1 +
 t/t7300-clean.sh                                  | 16 +++++++++
 6 files changed, 103 insertions(+), 6 deletions(-)