[issue16596] Skip stack unwinding when "next", "until" and "return" pdb commands executed in generator context

[Xavier de Gaye]

Xavier de Gaye added the comment:

The 'until' command is also broken (by xdegaye's patch) when issued at a return
debug event and not debugging a generator.

This new patch fixes both problems.

The patch also adds another test case to check that pdb stops after a 'next',
'until' or 'return' command has been issued at a return debug event.

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Added file: http://bugs.python.org/file28280/issue16596_nostate_2.diff

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