When we abort an interactive rebase we do so by calling
`die_abort`, which cleans up after us by removing the rebase
state directory. If the user has requested to use the autostash
feature, though, the state directory may also contain a reference
to the autostash, which will now be deleted.

Fix the issue by trying to re-apply the autostash in `die_abort`.
This will also handle the case where the autostash does not apply
cleanly anymore by recording it in a user-visible stash.

Reported-by: Daniel Hahler <g...@thequod.de>
Signed-off-by: Patrick Steinhardt <p...@pks.im>
---
 git-rebase--interactive.sh  |  1 +
 t/t3420-rebase-autostash.sh | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index 05f22e4..4f499d2 100644
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -212,6 +212,7 @@ exit_with_patch () {
 }
 
 die_abort () {
+       apply_autostash
        rm -rf "$state_dir"
        die "$1"
 }
diff --git a/t/t3420-rebase-autostash.sh b/t/t3420-rebase-autostash.sh
index 944154b..2e1171e 100755
--- a/t/t3420-rebase-autostash.sh
+++ b/t/t3420-rebase-autostash.sh
@@ -192,4 +192,15 @@ test_expect_success 'abort rebase -i with --autostash' '
        test_cmp expected file0
 '
 
+test_expect_success 'restore autostash on editor failure' '
+       test_when_finished "git reset --hard" &&
+       echo uncommited-content >file0 &&
+       (
+               test_set_editor "false" &&
+               test_must_fail git rebase -i --autostash HEAD^
+       ) &&
+       echo uncommited-content >expected &&
+       test_cmp expected file0
+'
+
 test_done
-- 
2.9.0

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