When rebasing commits where one or several commits are redundant
to commits on the branch that is being rebased upon we error out.
This is due to the usage of `--allow-empty` for the invoked
cherry-pick command, which will only cause _empty_ commits to be
picked instead of also allowing redundant commits. As
git-rebase(1) mentions, though, we also want to keep commits that
do not change anything from its parents, that is also redundant
commits.

Fix this by invoking `git cherry-pick --keep-redundant-commits`
instead, which will cause redundant commits to be rebased
correctly.

Signed-off-by: Patrick Steinhardt <p...@pks.im>
---
 git-rebase--am.sh | 2 +-
 t/t3400-rebase.sh | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/git-rebase--am.sh b/git-rebase--am.sh
index 9ae898b..ea7b897 100644
--- a/git-rebase--am.sh
+++ b/git-rebase--am.sh
@@ -44,7 +44,7 @@ then
        # empty commits and even if it didn't the format doesn't really lend
        # itself well to recording empty patches.  fortunately, cherry-pick
        # makes this easy
-       git cherry-pick ${gpg_sign_opt:+"$gpg_sign_opt"} --allow-empty \
+       git cherry-pick ${gpg_sign_opt:+"$gpg_sign_opt"} 
--keep-redundant-commits \
                --right-only "$revisions" \
                ${restrict_revision+^$restrict_revision}
        ret=$?
diff --git a/t/t3400-rebase.sh b/t/t3400-rebase.sh
index 6cca319..f43b202 100755
--- a/t/t3400-rebase.sh
+++ b/t/t3400-rebase.sh
@@ -255,7 +255,7 @@ test_expect_success 'rebase commit with an ancient 
timestamp' '
        grep "author .* 34567 +0600$" actual
 '
 
-test_expect_failure 'rebase duplicated commit with --keep-empty' '
+test_expect_success 'rebase duplicated commit with --keep-empty' '
        git reset --hard &&
        git checkout master &&
 
-- 
2.6.3

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