I noticed when editing documents, sometimes in larger documents, I started to see "incorrect" symbol positions in the editor. I believe this is because of the async nature of the language server, but the sync nature of tsc. I believe the symbols were starting to be calculated while additional text edits were occurring in the document, which resulted in the response positions for the symbols being off a few positions.

What we need to do is the version of the document before we go into tsc and then discard the results from tsc if the version of the document has changed, and re-run again with the new version until we get a matching pre and post versions. I guess we should also check into the cancellation API as well.