[3.9] bpo-41468: Improve and test IDLE run error exit (GH-21798) #21800
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A message box pops up when an unexpected error stops the run process. Tell users it is likely a random glitch, but report it if not.
(cherry picked from commit f2e161c)
Co-authored-by: Terry Jan Reedy [email protected]
https://bugs.python.org/issue41468