obshistory: use successorsandmarkers() from obsutil, drop local variant
It's been in core since 4.4 and is identical to the version removed by this
patch, except it returns None if ctx is not obsolete.
====================================Testingheadcheckingcode:CaseA-8====================================Mercurialchecksfortheintroductionofnewheadsonpush.Evolutioncomesintoplaytodetectifexistingbranchesontheserverarebeingreplacedbysomeofthenewonewepush.Thiscaseispartofaseriesoftestscheckingthisbehavior.CategoryA:simplecaseinvolvingabranchbeingsuperceededbyanother.TestCase8:single-changesetbranchindirectrewrite..old-state:....*1-changesetbranch....new-state:....*1-changesetbranchsucceedingtoA,throughanotherunpushedchangesets....expected-result:....*pushallowed....graph-summary:....A'.. A ø⇠ø⇠◔ A''.. |/ /.. | /.. |/.. ● $ . $TESTDIR/testlib/push-checkheads-util.shTest setup---------- $ mkdir A8 $ cd A8 $ setuprepos creating basic server and client repo updating to branch default 2 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd client $ hg up 0 0 files updated, 0 files merged, 1 files removed, 0 files unresolved $ mkcommit A1 created new head $ hg up 0 0 files updated, 0 files merged, 1 files removed, 0 files unresolved $ mkcommit A2 created new head $ hg debugobsolete `getid "desc(A0)" ` `getid "desc(A1)"` 1 new obsolescence markers obsoleted 1 changesets $ hg debugobsolete `getid "desc(A1)" ` `getid "desc(A2)"` 1 new obsolescence markers obsoleted 1 changesets $ hg log -G --hidden @ c1f8d089020f (draft): A2 | | x f6082bc4ffef (draft): A1 |/ | x 8aaa48160adc (draft): A0 |/ o 1e4be0697311 (public): rootActual testing-------------- $ hg push pushing to $TESTTMP/A8/server (glob) searching for changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files (+1 heads) 2 new obsolescence markers obsoleted 1 changesets $ cd ../..