[issue39107] Upgrade tcl/tk to 8.6.10 (Windows and maxOS)

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

On Windows, tk Scale['from'] is no longer rounded, matching ttk.Scale.  More details and conditional fix on the PR.

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versions: +Python 3.10 -Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39107>
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