[issue30264] [Windows] test_sax: Warning -- files was modified by test_sax

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> If you use directly the parser class and pass an open file object, in that case, yes, my change closes the file.

Or if the high-level *function* parse() is called with an open file object.

I don't know whether this is desirable change, but this change can break third-party code, therefore it should be documented in Misc/NEWS.

And it is worth to add a check in test_parse_bytes that the passed file object is closed after error.

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<http://bugs.python.org/issue30264>
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