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

[Louie Lu]

Louie Lu added the comment:

configdialog misuse `self.withdraw` at init, it should be `self.wm_withdraw`, #30900 fix this problem. After that, it should be a success to use event_generate in configdialog unittest with no `self.withdraw`.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30870>
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