[issue30870] IDLE: configdialog/fonts: change font when select by key up/down

[Terry J. Reedy]

Terry J. Reedy added the comment:

PR2666 adds 4% test coverage.  40% left to go.  I expect some tests will cover more lines with less code.

I am working on a test for set_font_sample.

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<http://bugs.python.org/issue30870>
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