Message 265100 - Python tracker

'raise KeyboardInterrupt' in code causes shell to hang until Restart Shell Cntl-F6 in invoked.

>>> 
[DEBUG ON]
>>> raise KeyboardInterrupt
<debug window activates.  Hit [step].  Window deactivates.  No prompt, even in response to Enter.  Shell unresponsive.>
<Restart Shell>
=============================== RESTART: Shell ===============================
[DEBUG ON]
>>> 

The behavior was noted by pperry on #26949, which is about SystemExit behavior.  I currently think it part of this issue.