[issue4180] warnings.simplefilter("always") does not make warnings always show up

[Tres Seaver]

Tres Seaver <tseaver at agendaless.com> added the comment:

This patch adds tests for the 'error', 'ignore', and 'always' filters being applied *after* the default warning has been issued, and therefore the registry populated.  It causes failures for the 'error' and 'always' on both the Python and C sides.

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Added file: http://bugs.python.org/file17145/issue4180-test_filter_after_default.diff

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