Issue #22769: Fixed ttk.Treeview.tag_has() when called without arguments.

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branch : 2.7
Issue #17293: uuid.getnode() now determines MAC address on AIX using netstat.
Based on patch by Aivars Kalvāns.

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branch : 2.7
Backported tests for issue #22406.

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branch : 2.7
Issues #814253, #9179: Group references and conditional group references now
work in lookbehind assertions in regular expressions.

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branch : 2.7
Silence the failure of test_pyclbr after adding a property in sre_parse
(issue #814253).

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branch : 2.7