[issue36388] pdb: do_debug installs sys.settrace handler when used inside post_mortem

[daniel hahler]

Change by daniel hahler <python-bugs at thequod.de>:


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keywords: +patch
pull_requests: +12431
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36388>
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