[MERGE] Fixed bug related to test_iter_changes_new breakage on Windows

[Aaron Bentley]

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Alexander Belchenko wrote:

> OK. But I'm curious why this test was not fails before WT4 is introduced
> and only starts to fails now with WT4. I'm hope there is not because
> of some latent bug in workingtree_4.py.

It's because previously, _iter_changes never provided information about
unversioned files, but now it does.

Aaron
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