#5956 Add user ids preservation upon fixing keys

[martgil]

This PR preserves user ids upon fixing keys.

close #5956

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Tests (delete all except exactly one):

• Tests added or updated

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To be filled by reviewers

I have reviewed that this PR... (tick whichever items you personally focused on during this review):

• addresses the issue it closes (if any)
• code is readable and understandable
• is accompanied with tests, or tests are not needed
• is free of vulnerabilities
• is documented clearly and usefully, or doesn't need documentation

[sosnovsky]

hi @martgil, extension fails to build here and there are some issues found by ESLint, please check them too, thanks!

[martgil]

Hi again @sosnovsky - this one is ready for a review. Thank you!

[sosnovsky]

well done 👍