Documentation / config / sequencer.txton commit tests: define GIT_TEST_SIDEBAND_ALL (07c3c2a)
   1sequence.editor::
   2        Text editor used by `git rebase -i` for editing the rebase instruction file.
   3        The value is meant to be interpreted by the shell when it is used.
   4        It can be overridden by the `GIT_SEQUENCE_EDITOR` environment variable.
   5        When not configured the default commit message editor is used instead.