Merge branch 'pw/rebase-i-regression-fix-tests' into maint

Fix a recent regression to "git rebase -i" and add tests that would have caught it and others. * pw/rebase-i-regression-fix-tests: t3420: fix under GETTEXT_POISON build rebase: add more regression tests for console output rebase: add regression tests for console output rebase -i: add test for reflog message sequencer: print autostash messages to stderr