[issue40893] tkinter integrate TkDND support

[E. Paine]

Change by E. Paine <paineelisha at gmail.com>:


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pull_requests: +20079
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/20896

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40893>
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