[MERGE] don't accept unversioned files for commit (#50793)

[Aaron Bentley]

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John Arbash Meinel wrote:
> v-- I would fix the import lines to read:
> 
> from bzrlib import (
>     errors,
>     tree,
>     )

Okay.

> And then get rid of the import bzrlib.errors as errors. (And if there
> are other imports like this, do that as well.

> ^- This feels a little bit like we are doing some work, and then
> throwing it away. 

Yes, that's exactly what we're doing.

> But I think it covers up our mistake, which is
> probably sufficient for now.

I had a look at switching commit over to using file ids, and it was far
too invasive a change for 0.11.  Long term, I'd like to do that, though.
 Because commit.py is doing argument validation, and that's really the
wrong place to do it.

> So you have my +1 for 0.11.

Thanks.  Submitted with your changes.

Aaron
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