CONTRIBUTORS

rebase: skip resolved but emptied revisions

When rebasing, if a conflict occurs and is resolved in a way the rebased
revision becomes empty, it is not skipped, unlike revisions being emptied
without conflicts.

The reason is:
- File 'x' is merged and resolved, merge.update() marks it as 'm' in the
  dirstate.
- rebase.concludenode() calls localrepo.commit(), which calls
  localrepo.status() which calls dirstate.status(). 'x' shows up as 'm' and is
  unconditionnally added to the modified files list, instead of being checked
  again.
- localrepo.commit() detects 'x' as changed an create a new revision where only
  the manifest parents and linkrev differ.

Marking 'x' as modified without checking it makes sense for regular merges. But
in rebase case, the merge looks normal but the second parent is usually
discarded. When this happens, 'm' files in dirstate are a bit irrelevant and
should be considered 'n' possibly dirty instead. That is what the current patch
does.

Another approach, maybe more efficient, would be to pass another flag to
merge.update() saying the 'branchmerge' is a bit of a lie and recordupdate()
should call dirstate.normallookup() instead of merge().

It is also tempting to add this logic to dirstate.setparents(), moving from two
to one parent is what invalidates the 'm' markers. But this is a far bigger
change to make.

v2: succumb to the temptation and move the logic in dirstate.setparents(). mpm
suggested trying _filecommit() first but it is called by commitctx() which
knows nothing about the dirstate and comes too late into the game. A second
approach was to rewrite the 'm' state into 'n' on the fly in dirstate.status()
which failed for graft in the following case:

  $ hg init repo
  $ cd repo
  $ echo a > a
  $ hg ci -qAm0
  $ echo a >> a
  $ hg ci -m1
  $ hg up 0
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg mv a b
  $ echo c > b
  $ hg ci -m2
  created new head
  $ hg graft 1 --tool internal:local
  grafting revision 1
  $ hg --config extensions.graphlog= glog --template '{rev} {desc|firstline}\n'
  @  3 1
  |
  o  2 2
  |
  | o  1 1
  |/
  o  0 0

  $ hg log -r 3 --debug --patch --git --copies
  changeset:   3:19cd7d1417952af13161b94c32e901769104560c
  tag:         tip
  phase:       draft
  parent:      2:b5c505595c9e9a12d5dd457919c143e05fc16fb8
  parent:      -1:0000000000000000000000000000000000000000
  manifest:    3:3d27ce8d02241aa59b60804805edf103c5c0cda4
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  extra:       branch=default
  extra:       source=a03df74c41413a75c0a42997fc36c2de97b26658
  description:
  1

Here, revision 3 is created because there is a copy record for 'b' in the
dirstate and thus 'b' is considered modified. But this information is discarded
at commit time since 'b' content is unchanged. I do not know if discarding this
information is correct or not, but at this time we cannot represent it anyway.

This patch therefore implements the last solution of moving the logic into
dirstate.setparents(). It does not sound crazy as 'm' files makes no sense with
only one parent. It also makes dirstate.merge() calls .lookupnormal() if there
is one parent, to preserve the invariant.

I am a bit concerned about introducing this kind of stateful behaviour to
existing code which historically treated setparents() as a basic setter without
side-effects. And doing that during the code freeze.

[This file is here for historical purposes, all recent contributors
should appear in the changelog directly]

Andrea Arcangeli <andrea at suse.de>
Thomas Arendsen Hein <thomas at intevation.de>
Goffredo Baroncelli <kreijack at libero.it>
Muli Ben-Yehuda <mulix at mulix.org>
Mikael Berthe <mikael at lilotux.net>
Benoit Boissinot <bboissin at gmail.com>
Brendan Cully <brendan at kublai.com>
Vincent Danjean <vdanjean.ml at free.fr>
Jake Edge <jake at edge2.net>
Michael Fetterman <michael.fetterman at intel.com>
Edouard Gomez <ed.gomez at free.fr>
Eric Hopper <hopper at omnifarious.org>
Alecs King <alecsk at gmail.com>
Volker Kleinfeld <Volker.Kleinfeld at gmx.de>
Vadim Lebedev <vadim at mbdsys.com>
Christopher Li <hg at chrisli.org>
Chris Mason <mason at suse.com>
Colin McMillen <mcmillen at cs.cmu.edu>
Wojciech Milkowski <wmilkowski at interia.pl>
Chad Netzer <chad.netzer at gmail.com>
Bryan O'Sullivan <bos at serpentine.com>
Vicent Seguí Pascual <vseguip at gmail.com>
Sean Perry <shaleh at speakeasy.net>
Nguyen Anh Quynh <aquynh at gmail.com>
Ollivier Robert <roberto at keltia.freenix.fr>
Alexander Schremmer <alex at alexanderweb.de>
Arun Sharma <arun at sharma-home.net>
Josef "Jeff" Sipek <jeffpc at optonline.net>
Kevin Smith <yarcs at qualitycode.com>
TK Soh <teekaysoh at yahoo.com>
Radoslaw Szkodzinski <astralstorm at gorzow.mm.pl>
Samuel Tardieu <sam at rfc1149.net>
K Thananchayan <thananck at yahoo.com>
Andrew Thompson <andrewkt at aktzero.com>
Michael S. Tsirkin <mst at mellanox.co.il>
Rafael Villar Burke <pachi at mmn-arquitectos.com>
Tristan Wibberley <tristan at wibberley.org>
Mark Williamson <mark.williamson at cl.cam.ac.uk>