[issue36494] bdb: should set f_trace_lines = True

Change by daniel hahler : -- keywords: +patch pull_requests: +12572 stage: -> patch review ___ Python tracker ___ ___ Python-bugs-l

[issue36494] bdb: should set f_trace_lines = True

New submission from daniel hahler : 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/nedb