size-limit report 📦

I just read the LSP spec,
and I think that we should just be aware what the spec says:

https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_publishDiagnostics

• if a language is single file only (for example HTML) then diagnostics are cleared by the server when the file is closed. Please note that open / close events don’t necessarily reflect what the user sees in the user interface. These events are ownership events. So with the current version of the specification it is possible that problems are not cleared although the file is not visible in the user interface since the client has not closed the file yet.
• if a language has a project system (for example C#) diagnostics are not cleared when a file closes. When a project is opened all diagnostics for all files are recomputed (or read from a cache).

TS server belongs to the list of languages that has projects, so I think this PR might affect to sometimes clear diagnostics when it shouldn't.

As I said, I want us to be aware of what the spec says.
This PR brings the behavior of how VS Code behaves and fixes one issue.

This server doesn't provide diagnostics for all project files so the second case doesn't apply to it and it would be wrong to not clear file diagnostics on closing the file then.