Disallow stdin until input_requests are handled

Currently stdin_channel is ignored which means the kernel freezes
waiting for a stdin reply if input() is called. Pass allow_stdin=False
to give an immediate exception instead of hanging.

Author: wilywampa

ftplugin/python/vim_ipython.py

@@ -229,6 +229,7 @@ def km_from_string(s=''):
         def send(msg, **kwargs):
             kwds = dict(
                 store_history=vim_vars.get('ipython_store_history', True),
+                allow_stdin=False,
             )
             kwds.update(kwargs)
             return execute(msg, **kwds)