[issue31004] IDLE, configdialog: Factor out FontTab class from ConfigDialog

[Terry J. Reedy]

Terry J. Reedy added the comment:

I will push Notebook when CI passes.  We can then do Step 2 for class FontPage(Frame).  Consider the font code frozen for now.  Pass 'note', not the dialog, as the parent.  This makes tab switching work better.

Create the highlight frame first and pass it as a second argument to FontPage.  Adding set_samples to load_font_config should solve the initial font problem.

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<http://bugs.python.org/issue31004>
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