[issue25911] Regression: os.walk now using os.scandir() breaks bytes filenames on windows

[STINNER Victor]

STINNER Victor added the comment:

I faile to reproduce the bug by running test_os alone on Windows 8.

I wrote a script to try to isolate a sequential list of tests which reproduce the bug on Windows, but I failed to find such list after 2 hours:
https://bitbucket.org/haypo/misc/src/3e2e6138798c6cec061544ff116e50a8d1d6d2b8/python/isolate.py?fileviewer=file-view-default

So I'm unable to reproduce the bug, I tried a change to enhance os._DummyDirEntry, it should now mimick better the C implementation of os.DirEntry. Let's see if the test still fails randomly...

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<http://bugs.python.org/issue25911>
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