[issue24790] Idle: improve stack viewer

[Terry J. Reedy]

Terry J. Reedy added the comment:

A fair question. The API is a private implementation for Idle (see PEP 434), though I am generally avoiding breaking any public uses thereof.  I actually checked that the method is not defined on the base class.  But on the microchance that someone uses it, I will restore the methods.

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