Always use ZMQ stream not socket in dispatch_shell #1432
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Currently using a ZMQ socket not stream here:
ipykernel/ipykernel/kernelbase.py
Line 421 in 39d4c74
which can cause problems downstream (e.g. in
qtconsole,jupyterlab) when a stream is expected rather than a socket. So here switching to using a stream. This uses an optionalSocketPair.from_streamwhich is only used for the main/subshell to shell channel socket pairs.