Merge branch 'ak/sequencer-fix-find-uniq-abbrev'

Ring buffer with size 4 used for bin-hex translation resulted in a
wrong object name in the sequencer's todo output, which has been
corrected.

* ak/sequencer-fix-find-uniq-abbrev:
  rebase -i: fix possibly wrong onto hash in todo

diff --cc sequencer.c
Simple merge

diff --cc t/t3404-rebase-interactive.sh
Simple merge