[RFC] _iter_changes want_unversioned should also expand out across renames

[Robert Collins]

At the moment when one passes in want_unversioned, only unversioned
files directly in the specified paths given are found.

I think this has a failure mode - if I have
/
/dir

and then rename it:
/
/newdirname

and add a unversioned file

/
/newdirname/unversioned

In our as-yet unimplemented 'commit -A dir' I would expect, and I think
users would too, that when we commit newdirname (because its 'dir
renamed'), we would include its contents - which is the file
unversioned.

If this makes sense I'll file a bug on _iter_changes.

-Rob


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