[PATCH 0/4] diff --cc: relax path filtering

For diff --cc, paths fitering used to select only paths which have
changed in all parents, while diffing itself output hunks which are
changed in as few as 2 parents.

Fix intersect_paths() to add paths which have at least 2 changed
parents.

Intersects with branch 'bc/object-id' which is not yet in master. This is
rebased on top of it.

Max Kirillov (4):
  Add test for showing discarded changes with diff --cc
  combine-diff.c: refactor: extract insert_path()
  diff --cc: relax too strict paths picking
  t4059: rewrite to be adaptive to hunk filtering

 combine-diff.c                  |  95 ++++++++++++++++++-----------
 t/t4059-diff-merge-with-base.sh | 132 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 193 insertions(+), 34 deletions(-)
 create mode 100755 t/t4059-diff-merge-with-base.sh

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2.3.4.2801.g3d0809b