[issue35928] socket makefile read-write discards received data

[Palle Ravn]

Palle Ravn <p.ravn at samsung.com> added the comment:

>>> f = TextIOWrapper(BufferedRWPair(BytesIO(b"Hello\nYou\n"), BytesIO()))
>>> f.readline()
'Hello\n'
>>> f.write(_)
6
>>> f.readline()  # Returns empty string
''

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35928>
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