[issue17277] incorrect line numbers in backtrace after removing a trace function

[Xavier de Gaye]

Xavier de Gaye added the comment:

The patch (on the default branch) reverts one of the changes made in r72488 to
introduce the new PyFrame_GetLineNumber() function (issue 5954): tb_lineno is
now back again the result of the call to PyCode_Addr2Line() instead of the
call to PyFrame_GetLineNumber().

The other changes made by r72488 in _warnings.c and ceval.c should also
probably be reverted as well.

The patch updates bdb set_continue() for consistency.

The patch adds a test to test_sys_settrace.

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keywords: +patch
Added file: http://bugs.python.org/file29170/backtrace_lno.patch

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