[Bug 5264] New: `hg split` should check for public phase early

[mercurial-bugs at selenic.com]

https://bz.mercurial-scm.org/show_bug.cgi?id=5264

            Bug ID: 5264
           Summary: `hg split` should check for public phase early
           Product: Mercurial
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: UNCONFIRMED
          Severity: feature
          Priority: wish
         Component: evolution
          Assignee: bugzilla at selenic.com
          Reporter: hg at pewpew.net
                CC: mercurial-devel at selenic.com,
                    pierre-yves.david at ens-lyon.org

`hg split` lets me get all the way through splitting a changeset before telling
me that it can't obsolete public phase commits.  It should probably check if
the commit being split is public phase before proceeding.

> hg init .
> echo hi > foo
> echo bye > bar
> hg ci -Am 'foo and bar'
adding bar
adding foo
> hg phase -p .
> hg xl
@  0:a98d5336 spectral tip
   foo and bar
> HGRCPATH=/dev/null hg --config ui.username='kyle' --config extensions.evolve=$HOME/src/hg/mutable-history/hgext/evolve.py split
0 files updated, 0 files merged, 2 files removed, 0 files unresolved
adding bar
adding foo
diff --git a/bar b/bar
new file mode 100644
examine changes to 'bar'? [Ynesfdaq?] y

@@ -0,0 +1,1 @@
+bye
record change 1/2 to 'bar'? [Ynesfdaq?] y

diff --git a/foo b/foo
new file mode 100644
examine changes to 'foo'? [Ynesfdaq?] n

created new head                                                                
Done splitting? [yN] y
transaction abort!
rollback completed
abort: cannot obsolete public changeset: a98d53361f1e
(see "hg help phases" for details)
> hg xl
@  0:a98d5336 spectral tip
   foo and bar


Version information:
> hg --version
Mercurial Distributed SCM (version 3.8.1+37-983353035cec)
(see https://mercurial-scm.org for more information)

Copyright (C) 2005-2016 Matt Mackall and others
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> hg -R $HOME/src/hg/mutable-history summary
parent: 1711:7a2e0629bdee 
 inhibit: protect agains dropped 'bmstore.write'
branch: stable
bookmarks: @
commit: (clean)
update: (current)

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