[issue22115] Add new methods to trace Tkinter variables

[Roundup Robot]

Roundup Robot added the comment:

New changeset a201180c0f77 by Serhiy Storchaka in branch 'default':
Issue #22115: Added methods trace_add, trace_remove and trace_info in the
https://hg.python.org/cpython/rev/a201180c0f77

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nosy: +python-dev

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<http://bugs.python.org/issue22115>
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