Re: make test Unexpected passes

[Junio C Hamano <gitster@pobox.com>]

Ben Woosley <ben.woosley@gmail.com> writes:

> These know breakages:
>
> ok 50 - rebase -m --onto --root
> ok 54 - rebase -m without --onto --root with disjoint history
>
> Have to do with rebasing a root/orphan branch with the -m flag,
> which defaults to -- merge=recursive, which is the case the patch fixed.
>
> Here are the necessary changes:
> ...

Thanks, will squash them in and reword the log message accordingly.

    git-rebase--merge: don't include absent parent as a base

    Absent this fix, attempts to rebase an orphan branch using "rebase -m"
    fails with:

        $ git rebase -m ORPHAN_TARGET_BASE
        First, rewinding head to replay your work on top of it...
        ...
    Note the default rebase behavior does not fail:

        $ git rebase ORPHAN_TARGET_BASE
        First, rewinding head to replay your work on top of it...
        Applying: ORPHAN_ROOT_COMMIT_MSG
        Using index info to reconstruct a base tree...

    A few tests were expecting the old behaviour to forbid rebasing such
    a history with "rebase -m", which now need to expect them to succeed.

    Signed-off-by: Ben Woosley <ben.woosley@gmail.com>
    Signed-off-by: Junio C Hamano <gitster@pobox.com>