[issue36494] bdb: should set f_trace_lines = True

[daniel hahler]

New submission from daniel hahler <python-bugs at thequod.de>:

bdb.Bdb.set_trace should set "f_trace_lines = True" on frames explicitly.

Otherwise they might be skipped if something else has set it to False already, e.g. via a suggested change for coverage.py to set this for performance reasons (https://github.com/nedbat/coveragepy/pull/791).

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messages: 339259
nosy: blueyed
priority: normal
severity: normal
status: open
title: bdb: should set f_trace_lines = True
versions: Python 3.7, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36494>
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