(optionally, can use some other commit which is ff
from all of the above, eg one of them)
-N. git-debrebase record-ffrebase
+N. git-debrebase record-ffqrebase
does what is described above
will-overwrite for each ref
refs/heads/FOO
is
- refs/ffrebase/FOO
+ refs/ffqrebase/FOO
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