disappearing divergence state?

[Matt Harbison]

I'm not sure what is going on here, so I thought I solicit debugging ideas.

Based on timestamp and the lack of a corresponding email CC'd to my inbox,  
I must have used pushgate to submit this series.  I haven't noticed an  
issue with pushgate before though.

     https://selenic.com/pipermail/mercurial-devel/2015-December/076969.html

When I got back to work and pulled today, the successors were in the  
transfer, and these 3 commits were marked "unstable, divergent".  The thg  
graph didn't give any clues about successors, so I tried `hg debugobsolete  
$orig_node`.  It cranked away for a few seconds, and exited without  
printing anything.  At that point, I noticed that $orig_node was now  
changed to "obsolete", and no longer divergent or unstable.  `hg log -r  
divergent()` printed the remaining 2 nodes, so this wasn't a transient or  
thg issue.

Any idea what is going on here?  I have the latest default, and evolve  
should be no more than 3 weeks old or so.  I repeated `hg debugobsolete`  
on the second commit, and the same thing happened.  Therefore, there's one  
left to experiment on (I suppose I could backup obsstore, anything else?)

 From what I can tell, there is no actual divergence.  Locally, the  
affected commits are:

$ hg log -r 28448::
changeset:   28448:980d61134536
user:        Matt Harbison <matt_harbison at yahoo.com>
date:        Wed Dec 16 13:33:43 2015 -0500
summary:     windows: correct the import of win32

changeset:   28449:a90528e0296e
user:        Matt Harbison <matt_harbison at yahoo.com>
date:        Wed Dec 16 17:17:36 2015 -0500
summary:     test-default-push: make `pwd` URL compatible on Windows

changeset:   28450:5b5faa5397f1
user:        Matt Harbison <matt_harbison at yahoo.com>
date:        Wed Dec 16 17:22:37 2015 -0500
summary:     test-check-py3: convert directory separators to '/' for MSYS