[issue30779] IDLE: configdialog -- factor out Changes class

[Cheryl Sabella]

Cheryl Sabella added the comment:

Sorry about that.  When I read msg297804, I thought your intention was for me to work on the PRs.  I didn't see your other note until now.  It will be good for me to learn from your changes.

As far as mocking Save, I sort of did that (very basically) in my PR by using Func().  It wasn't covering everything because I only added it for 'main'.  Do you think I should continue with that in #30868 or did you want to do it a different way?

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<http://bugs.python.org/issue30779>
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