[issue33987] IDLE: use ttk.Frame for ttk widgets

[Mark Roseman]

Change by Mark Roseman <mark at markroseman.com>:


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pull_requests: +21860
pull_request: https://github.com/python/cpython/pull/22942

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33987>
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