[issue20766] reference leaks in pdb

[Xavier de Gaye]

Xavier de Gaye added the comment:

After refleak_3.patch, test_pdb_next_command_in_generator_for_loop is the only remaining test that sets a breakpoint without reinitializing the breakpoints numbering first.
As a result, this test may also fail in the future when tests are reordered by the unittest machinery.
refleak_4.patch adds a fix to that (and could be ignored as a problem that should be fixed in a new issue of its own).

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Added file: http://bugs.python.org/file36258/refleak_4.patch

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