[Bug 5219] New: rebase fails when run from hidden commit

[mercurial-bugs at selenic.com]

https://bz.mercurial-scm.org/show_bug.cgi?id=5219

            Bug ID: 5219
           Summary: rebase fails when run from hidden commit
           Product: Mercurial
           Version: 3.8-rc
          Hardware: PC
                OS: Linux
            Status: UNCONFIRMED
          Severity: bug
          Priority: wish
         Component: rebase
          Assignee: bugzilla at selenic.com
          Reporter: martinvonz at google.com
                CC: mercurial-devel at selenic.com

The below creates a few changes, checks out a hidden commit, then rebases some
other commit onto yet another commit. The output from rebase is this:

rebasing 2:2f0b498f8635 "2"
abort: hidden revision '3'!
(use --hidden to access hidden revisions)

The rebase seems to mostly succeed, but fails when it tries to move back to the
hidden commit. The new commit is created, but the obsmarker is not, so there
are two (unobsolete) commits with description "2" after the failed rebase.

rm -rf repo
hg init repo
cd repo
echo a > f0
hg ci -Aqm 0
echo a > f1
hg ci -Aqm 1
echo a > f2
hg ci -Aqm 2
hg co .^
hg amend -m 3
hg amend -m 4
hg --hidden co 3
hg log -G
hg rebase -d 4 -r 2
hg log -G

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