Request completionItem/resolve failed

[Veykril]

This randomly occured, when it clearly shouldn't, not reproduction unfortunately

[Error - 9:18:48 AM] Request completionItem/resolve failed.
  Message: Import edit overlaps with the original completion edits, this is not LSP-compliant
  Code: -32603 

[SomeoneToIgnore]

This seems similar to what's been described in #18547 (comment) and another implication of the issue with the completions resolve impl.

I liked the proposed hash lookup strategy, should we try to implement that, instead of the caching approach?

[Veykril]

Yes let's do that, the server is stateless wrt to requests so the caching would be quite annoying to implement I think (and we probably don't want to do that)