[issue37011] pdb: restore original tracing function instead of sys.settrace(None)

[Rémi Lapeyre]

Rémi Lapeyre <remi.lapeyre at henki.fr> added the comment:

> The proposed change is not backward compatible.

Indeed, I missed that thanks. I think I could fix that.

> A motivation for this change should be provided first

Is getting accurate coverage reports not enough?

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<https://bugs.python.org/issue37011>
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