[issue45979] Fix Tkinter tests with old Tk

[E. Paine]

E. Paine <xepaine13 at gmail.com> added the comment:

Is support for such old Tk versions useful? 8.5.4 was released in late 2008, and I highly doubt anyone would still be using it. IMO, 8.5.12 would be a good compromise, since we're giving support to a version more than 9 years old, but would simplify PR-29913 by removing several 8.5.x specific branches. (FYI, 8.5.12 was released on 2012-07-27 and 8.6.0 on 2012-12-20)

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