[issue40452] Tkinter/IDLE: preserve clipboard on closure

[Tal Einat]

Tal Einat <taleinat+python at gmail.com> added the comment:

> Can we backport?  The change to _tkinter, not directly exposed in tkinter, could be considered an enhancement, but is necessary to fix what I consider a real bug in tkinter, and hence in IDLE.

I'm +1 for backporting the latest PR.  It only adds the clearly internal and undocumented _tkinter.finalize_tcl(), which is only used by IDLE.

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