[issue31508] Running test_ttk_guionly logs "test_widgets.py:1562: UserWarning: Deprecated API of Treeview.selection() should be removed" warnings

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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keywords: +patch
pull_requests: +3644
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31508>
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