[issue24137] Force not using _default_root in IDLE

[Roundup Robot]

Roundup Robot added the comment:

New changeset a6a248479b66 by Terry Jan Reedy in branch 'default':
Issue #27611, #24137: Only change tkinter when easily restored.
https://hg.python.org/cpython/rev/a6a248479b66

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24137>
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