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I had another look at this and it seems that the problem is
in the Modules/_tkinter.c. If I understand correctly,
tkinter does not use the code in Modules/readline.c, which
contains the call to PyOS_InputHook, and hence
PyOS_InputHook is not being called. Surprisingly, the
tkinter code does set the PyOS_InputHook variable to the
EventHook routine, but this seems to be in vain as
PyOS_InputHook is not being called anyway. I suggest to
resubmit this bug report to the Tkinter category.