[issue45979] Fix Tkinter tests with old Tk

[Serhiy Storchaka]

New submission from Serhiy Storchaka <storchaka+cpython at gmail.com>:

Some recently added tests are not compatible with old Tk versions. I have build all 8.5 and 8.6 versions and build and test Tkinter against them. The proposed PR makes tests passes on Tk versions 8.5.4 to 8.5.19 and 8.6.0 to 8.6.12. There are some issues with running the pure Tk shell for versions < 8.5.4 so I skipped them.

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components: Tests, Tkinter
messages: 407661
nosy: serhiy.storchaka
priority: normal
severity: normal
status: open
title: Fix Tkinter tests with old Tk
type: enhancement
versions: Python 3.10, Python 3.11, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45979>
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