[PATCH 0/6] am --skip/--abort: improve index/worktree cleanup

Currently git-am attempts to clean up the index/worktree when skipping or aborting, but does not do it very well:

* While it discards conflicted index entries, it does not remove any other
  modifications made to the index due to a previous threeway merge.

* It expects HEAD/ORIG_HEAD to exist, and thus does not clean up the index when
  on an unborn branch.

This patch series addresses the above two general problems by making the calls to git-read-tree aware of the differences between our current index and HEAD/ORIG_HEAD, and by explictly defining what happens when we are on an unborn branch.

Paul Tan (6):
  am --skip: revert changes introduced by failed 3way merge
  am -3: support 3way merge on unborn branch
  am --skip: support skipping while on unborn branch
  am --abort: revert changes introduced by failed 3way merge
  am --abort: support aborting to unborn branch
  am --abort: keep unrelated commits on unborn branch

 git-am.sh           | 31 ++++++++++++++------
 t/t4151-am-abort.sh | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 104 insertions(+), 8 deletions(-)