[issue33855] IDLE: Minimally test every non-startup module.

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Spinoffs:
 change rstrip.RstripExtension to Rstrip
 change stackviewer.StackBrowser to accept exception

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stage: patch review -> test needed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33855>
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