evolve: extract logic of pre-checking divergence risk to its own function Extracting the logic (which is used to check if rewriting an obsolete revision will create divergence) to a function. This function will be used in upcoming patches of pre-checking. This is how we check if rewriting an obsolete revision will create divergence. We need to check two cases: If there is any 1) non-obsolete successor. -> easily done by `obsutil.successorssets()` 2) precursor with non-obsolete successor. -> using `evolvecmd.divergentsets()`

heptapod-ci: skip test-evolve.t in tests-py2-pure job It seems pure mode on Mercurial 4.5 was broken in case of this test. The error was: Traceback (most recent call last): File "/tmp/hgtests.YoK65c/install/bin/hg", line 41, in <module> dispatch.run() File "/tmp/hgtests.YoK65c/install/lib/python/mercurial/dispatch.py", line 88, in run status = (dispatch(req) or 0) & 255 File "/tmp/hgtests.YoK65c/install/lib/python/mercurial/dispatch.py", line 183, in dispatch ret = _runcatch(req) File "/tmp/hgtests.YoK65c/install/lib/python/mercurial/dispatch.py", line 324, in _runcatch return _callcatch(ui, _runcatchfunc) File "/tmp/hgtests.YoK65c/install/lib/python/mercurial/dispatch.py", line 332, in _callcatch return scmutil.callcatch(ui, func) File "/tmp/hgtests.YoK65c/install/lib/python/mercurial/scmutil.py", line 154, in callcatch return func() File "/tmp/hgtests.YoK65c/install/lib/python/mercurial/dispatch.py", line 314, in _runcatchfunc return _dispatch(req) File "/tmp/hgtests.YoK65c/install/lib/python/mercurial/dispatch.py", line 918, in _dispatch cmdpats, cmdoptions) File "/tmp/hgtests.YoK65c/install/lib/python/mercurial/dispatch.py", line 673, in runcommand ret = _runcommand(ui, options, cmd, d) File "/tmp/hgtests.YoK65c/install/lib/python/mercurial/dispatch.py", line 926, in _runcommand return cmdfunc() File "/tmp/hgtests.YoK65c/install/lib/python/mercurial/dispatch.py", line 915, in <lambda> d = lambda: util.checksignature(func)(ui, *args, **strcmdopt) File "/tmp/hgtests.YoK65c/install/lib/python/mercurial/util.py", line 1195, in check return func(*args, **kwargs) File "/builds/mercurial/evolve/hgext3rd/evolve/evolvecmd.py", line 1603, in evolve return _performevolve(ui, repo, **opts) File "/builds/mercurial/evolve/hgext3rd/evolve/evolvecmd.py", line 1726, in _performevolve targetcat, lastsolved) File "/builds/mercurial/evolve/hgext3rd/evolve/evolvecmd.py", line 1752, in _solveonerev lastsolved=lastsolved, stacktmplt=stacktmplt) File "/builds/mercurial/evolve/hgext3rd/evolve/evolvecmd.py", line 80, in _solveone lastsolved=lastsolved) File "/builds/mercurial/evolve/hgext3rd/evolve/evolvecmd.py", line 183, in _solveunstable keepbranch, b'orphan') File "/builds/mercurial/evolve/hgext3rd/evolve/evolvecmd.py", line 952, in relocate fullnode = unfi.changelog.index.partialmatch(sha1) AttributeError: 'InlinedIndexObject' object has no attribute 'partialmatch'

heptapod-ci: test python 4.5 with the pure version of Mercurial the evolve extension is currently broken on 4.5-pure. So we get it in its own commit.

branching: merge with stable