[issue12607] subprocess(stdout=..., stderr=sys.stdout) breaks stderr for child

[Ross Lagerwall]

Ross Lagerwall <rosslagerwall at gmail.com> added the comment:

Attached is a patch which tests all combinations and includes a testcase.

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nosy: +pitrou
Added file: http://bugs.python.org/file22747/i12607_v2.patch

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