Message 328430 - Python tracker

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Content 
I'm not sure whether it is intended or not, but I noticed a change in the  behavior of `StreamReader` between version 3.7 and 3.8.

Basically, reading some received data from a closed TCP stream using `StreamReader.read` might hang forever, under certain conditions.

I'm not sure what those conditions are but I managed to reproduce the issue consistently with the following workflow:
 - server writes some data
 - client reads a part of the data
 - client closes the writer
 - server closes the writer
 - client tries to read the remaining data

The test attached implements the behavior. It fails on 3.8 but passes on 3.7