rebase --continue: remove .git/MERGE_MSG

Thanks for the comments on V1. I have expanded the commit message for the first patch to give a bit more context and reworded a couple of test descriptions in patch 2 as suggested by Elijah. Patch 3 is unchanged.

V1 Cover Letter:

If the user removes all the changes from the worktree without running git reset then rebase --continue leaves behind .git/MERGE_MSG which will then seed the message of the next commit. While working on this I noticed a couple of fixups for the test files I was adding to, I've cc'd Elijah in case my reasoning for patch 2 is off. Thanks to Victor for the bug report.

Phillip Wood (3):
t3403: fix commit authorship
rebase --apply: restore some tests
rebase --continue: remove .git/MERGE_MSG

 sequencer.c                |  3 +++
 t/t3403-rebase-skip.sh     | 13 +++++++++++--
 t/t3418-rebase-continue.sh | 18 ++++++++++++++----
 3 files changed, 28 insertions(+), 6 deletions(-)

base-commit: 2d755dfac9aadab25c3e025b849252b8c0a61465
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1013%2Fphillipwood%2Fwip%2Frebase-remove-merge-msg-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1013/phillipwood/wip/rebase-remove-merge-msg-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/1013

Range-diff vs v1:

1: 7559781ca92 ! 1: 8755dfa9d04 t3403: fix commit authorship
@@ Commit message
t3403: fix commit authorship

Setting GIT_AUTHOR_* when committing with --amend will only change the
- author if we also pass --reset-author
+ author if we also pass --reset-author. This commit is used in some
+ tests that ensure the author ident does not change when rebasing.
+ Creating this commit without changing the authorship meant that the
+ test would not catch regressions that caused rebase to discard the
+ original authorship information.

2: f7722dab21d ! 2: 84fe5823b4f rebase --apply: restore some tests
@@ Commit message
from "am" to "merge"", 2020-02-15). However some tests seem to have been missed leading to us testing the "merge" backend twice. This patch fixes some cases that I noticed while adding tests to these
- files, I have not audited all the other rebase test files.
+ files, I have not audited all the other rebase test files. I've
+ reworded a couple of the test descriptions to make it clear which
+ backend they are testing.

@@ t/t3403-rebase-skip.sh: test_expect_success setup '
test_expect_success 'rebase --skip can not be used with other options' '

## t/t3418-rebase-continue.sh ##
-@@ t/t3418-rebase-continue.sh: test_expect_success 'non-interactive rebase --continue works with touched file' +@@ t/t3418-rebase-continue.sh: test_expect_success 'setup' '
+ git checkout main
+ '
+
+-test_expect_success 'interactive rebase --continue works with touched file' ' ++test_expect_success 'merge based rebase --continue with works with touched file' '
+ rm -fr .git/rebase-* &&
+ git reset --hard &&
+ git checkout main &&
+@@ t/t3418-rebase-continue.sh: test_expect_success 'interactive rebase --continue works with touched file' '
+ git rebase --continue
+ '
+
+-test_expect_success 'non-interactive rebase --continue works with touched file' ' ++test_expect_success 'apply based rebase --continue works with touched file' '
+ rm -fr .git/rebase-* &&
git reset --hard &&
git checkout main &&

3: 6a63b657f13 ! 3: 028c9dfc460 rebase --continue: remove .git/MERGE_MSG

     @@ t/t3403-rebase-skip.sh: test_expect_success 'moved back to branch correctly' '
       	test_must_fail git rebase -i --onto goodbye \
      
       ## t/t3418-rebase-continue.sh ##
     -@@ t/t3418-rebase-continue.sh: test_expect_success 'interactive rebase --continue works with touched file' '
     +@@ t/t3418-rebase-continue.sh: test_expect_success 'merge based rebase --continue with works with touched file'
       	git rebase --continue
       '
       
     -+test_expect_success 'rebase --continue removes .git/MERGE_MSG' '
     ++test_expect_success 'merge based rebase --continue removes .git/MERGE_MSG' '
      +	git checkout -f --detach topic &&
      +
      +	test_must_fail git rebase --onto main HEAD^ &&
     @@ t/t3418-rebase-continue.sh: test_expect_success 'interactive rebase --continue w
      +	test_path_is_missing .git/MERGE_MSG
      +'
      +
     - test_expect_success 'non-interactive rebase --continue works with touched file' '
     + test_expect_success 'apply based rebase --continue works with touched file' '
       	rm -fr .git/rebase-* &&
       	git reset --hard &&

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