[issue33963] IDLE macosx: add tests.

[Ned Deily]

Ned Deily <nad at python.org> added the comment:

> Would this affect any of the installation adjustments?

I don't think so but there's one way to be sure :)  If you merge your changes to master, we can doublecheck before backporting them.

> Is the windowing type determined by the hardware, or by the macOS version?

The windowing type is determined by the variant of Tk that tkinter is dynamically linking with.  While Cocoa Tk is now the most common, it is still possible to run into the other variants; for example, MacPorts supports building an X11 (Xquartz) variant of Tk 8.6 along with a Cocoa one.  If support for the various window types isn't causing a maintenance burden, it would be nice to retain them.

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