PR: Do not reset the frames explorer while debugging

[impact27]

Description of Changes

After spyder-ide/spyder-kernels#381 the full stack is not sent to the frontend after every pdb command, so executing a command causes the frames explorer to reset. This PR solves that issue and adds a regression test.

• Wrote at least one-line docstrings (for any new functions)
• Added unit test(s) covering the changes (if testable)

• Included a screenshot or animation (if affecting the UI, see Licecap)

Issue(s) Resolved

Fixes #

Affirmation

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I affirm the Developer Certificate of Origin
with respect to all commits and content included in this PR,
and understand I am releasing the same under Spyder's MIT (Expat) license.

I certify the above statement is true and correct:

[pep8speaks]

Hello @impact27! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2022-06-29 21:22:46 UTC

[ccordoba12]

Thanks @impact27! I left some simple suggestions for you, otherwise looks good to me.

[ccordoba12]

Thanks @impact27!