[issue44489] _handle_existing_loggers should respect loggers that were manually disabled

[Vinay Sajip]

Change by Vinay Sajip <vinay_sajip at yahoo.co.uk>:


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type:  -> enhancement
versions: +Python 3.11 -Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44489>
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