[issue20567] test_idle causes test_ttk_guionly 'can't invoke "event" command: application has been destroyed' messages from Tk

[Terry J. Reedy]

Terry J. Reedy added the comment:

Using update_idletasks msg229182 is #27196; it succeeded in stopping 
ThemeChanged warnings.  Using 'no-default-root' msg229201 is #24137.

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