[Bug 5897] New: `hg next --evolve` is not abortable (exception: KeyError: 'startnode')

[mercurial-bugs at mercurial-scm.org]

https://bz.mercurial-scm.org/show_bug.cgi?id=5897

            Bug ID: 5897
           Summary: `hg next --evolve` is not abortable (exception:
                    KeyError: 'startnode')
           Product: Mercurial
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: UNCONFIRMED
          Severity: feature
          Priority: wish
         Component: evolution
          Assignee: bugzilla at mercurial-scm.org
          Reporter: hg at pewpew.net
                CC: mercurial-devel at mercurial-scm.org,
                    pierre-yves.david at ens-lyon.org

Created attachment 2008
  --> https://bz.mercurial-scm.org/attachment.cgi?id=2008&action=edit
Failing test that demonstrates issue

On evolve changeset 4736d0bb, hg version 4.6rc1, `hg next --evolve` with
unresolved conflicts followed by an `hg evolve --abort` raises KeyError:
'startnode'

This has been reproduced on a few other versions of evolve as well.  See the
attached .t file for a reproduction.

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