Re: [PATCH] rebase-i: keep old parents when preserving merges

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

Stephan Beyer <s-beyer@gmx.net> writes:

... Based on the discussion thread, here is a rewrite of the log message.

> When "rebase -i -p" tries to preserve merges of unrelated branches, it
> lost some parents:
>
>  - When you have more than two parents, the commit in the new history
>    ends up with fewer than expected number of parents and this breakage
>    goes unnoticed;
>
>  - When you are rebasing a merge with two parents and one is lost, the
>    command tries to cherry-pick the original merge commit, and the command
>    fails.
>
> Signed-off-by: Stephan Beyer <s-beyer@gmx.net>
>
> diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
> index a35212d..0df7640 100755
> --- a/git-rebase--interactive.sh
> +++ b/git-rebase--interactive.sh
> @@ -174,6 +174,8 @@ pick_one_preserving_merges () {
>  				new_parents="$new_parents $new_p"
>  				;;
>  			esac
> +		else
> +			new_parents="$new_parents $p"
>  		fi
>  	done

Reading the surrounding code, it makes me wonder if you also need to futz
with variables like $preserve and $fast_forward.