rebase: don't use rebased node as dirstate p2 (BC)
When rebasing a node, we currently use the rebased node as p2 in the
dirstate until just before we commit it (we then change to the desired
parents). This p2 is visible to the user when the rebase gets
interrupted because of merge conflicts. That can be useful to the user
as a reminder of which commit is currently being rebased, but I
believe it's incorrect for a few reasons:
* I think the dirstate parents should be the ones that will be set
when the commit is created.
* I think having two parents means that you're merging those two
commits, but when rebasing, you're generally grafting, not merging.
* When rebasing a merge commit, we should use the two desired parents
as dirstate parents (and we clearly can't have the rebased node as
a third dirstate parent).
* `hg graft` (and `hg update --merge`) sets only one parent and `hg
rebase` should be consistent with that.
I realize that this is a somewhat large user-visible change, but I
think it's worth it because it will simplify things quite a bit.
Differential Revision: https://phab.mercurial-scm.org/D7827
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complete hg \
'n/--cwd/d/' 'n/-R/d/' 'n/--repository/d/' \
'C/-/( -R --repository \
--cwd \
-y --noninteractive \
-q --quiet \
-v --verbose \
--config \
--debug \
--debugger \
--encoding \
--encodingmode \
--traceback \
--time \
--profile \
--version \
-h --help)/' \
'p/1/(add addremove annotate blame archive \
backout bisect bookmarks branch branches \
bundle cat clone commit ci \
copy cp debugancestor debugbuilddag debugcheckstate \
debugcommands debugcomplete debugdag debugdata debugdate \
debugfsinfo debugignore debugindex debugindexdot debuginstall \
debugpushkey debugrebuildstate debugrename debugrevspec debugsetparents \
debugstate debugsub debugwalk diff export \
forget grep heads help identify \
id import patch incoming in \
init locate log history manifest \
merge outgoing out parents paths \
pull push recover remove rm \
rename move mv resolve revert \
rollback root serve showconfig debugconfig \
status st summary sum tag \
tags tip unbundle update up \
checkout co verify version)/'