[issue30900] IDLE: Fix configdialog should use wm_withdraw

[Terry J. Reedy]

Terry J. Reedy added the comment:

I first beat my head against event_generate two or three years ago.  So I appreciate you taking a whack at it.  It is nice that Variable.set and invoke can be used for tests, but it would really be nice to have e_v work too.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30900>
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