[PATCH v2 0/2] Fix scissors bug during merge conflict

Thanks for your feedback, Junio.

I tried to reroll the patch by adding another option into the MERGE_MODE file but unfortunately, it didn't work completely because doing `merge --squash` doesn't produce a MERGE_MODE. In addition to this, because of the way merge and commit were structured, I needed to reorder a lot of calls because some variables were only being set after I needed them. Unless we want to produce a MERGE_MODE during --squash (which I don't think is worth it) I don't think that this is the way to go.

Instead, I just refined my first approach and only checked the contents of MERGE_MSG for a scissors line. The MERGE_MSG is going to be machine-generated anyway so we should be safe from accidentally ignoring a human-placed scissors line.

Changes since V1:
-----------------
* Only check MERGE_MSG for a scissors line instead of all prepended files
* Make a variable static in merge where appropriate
* Add passthrough options in pull
* Add documentation for the new option
* Add tests to ensure desired behaviour

Denton Liu (2):
  commit: don't add scissors line if one exists
  merge: add scissors line on merge conflict

 Documentation/merge-options.txt |  6 +++++
 builtin/commit.c                | 15 +++++++++--
 builtin/merge.c                 | 16 +++++++++++
 builtin/pull.c                  |  6 +++++
 t/t7600-merge.sh                | 48 +++++++++++++++++++++++++++++++++
 5 files changed, 89 insertions(+), 2 deletions(-)