[Bug 6891] New: Display graph of successor relations

[mercurial-bugs at mercurial-scm.org]

https://bz.mercurial-scm.org/show_bug.cgi?id=6891

            Bug ID: 6891
           Summary: Display graph of successor relations
           Product: Mercurial
           Version: 6.7.4
          Hardware: PC
                OS: NetBSD
            Status: UNCONFIRMED
          Severity: feature
          Priority: wish
         Component: evolution
          Assignee: bugzilla at mercurial-scm.org
          Reporter: mercurial-bugzilla at campbell.mumble.net
                CC: mercurial-devel at mercurial-scm.org,
                    pierre-yves.david at ens-lyon.org
    Python Version: ---

I would like to browse previous versions of a changeset series, e.g.:  hg log
--hidden -G -r 'topic(mytopic)'

When there's a graph of normal changes with parent relations, I can use `hg log
-G' to display these relations.

In addition to parent relations, I would also like to see the successor
relations.  But `hg log --hidden -G' doesn't seem to display them -- it does
show the successor relations as hashes in lines like `obsolete: amended using
amend as 1234:abc123deaf' or `obsolete: rewritten using histedit as
4321:feed321cba', but it doesn't display them in a graph identifying connecting
the log entries.

For example, I would like to see `hg log' express a diagram something like Fig.
6 at: https://www.mercurial-scm.org/doc/evolution/user-guide.html

Is there already a way to do this?  Can `hg log' be taught to display two kinds
of relations, ideally with nice clustering so that different versions of a
changeset series are grouped together?

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