CodelensProvider not refreshing when changing documents

[eusebiu]

Extension sample

codelens-sample

VS Code version

1.86

What went wrong?

1. Start from codelens-sample - https://github.com/microsoft/vscode-extension-samples/blob/main/codelens-sample/
2. run the extension (with C# DevKit installed)
3. write some C# code in one document and see the code lens appearing (including the C# ones)
4. open another document and write some text and see the code lens appearing
5. change back to the first C# document
6. The codelens do not appear until something is typed or window is refocused (e.g. ALT+Tab) and existing ones are disabled (not clickable).