Fix inlay hints reading from disk instead of editor buffer

[shulhi]

The inlay hints doesn't read the document from the buffer, but instead read it from disk. This causes stale position location when the document is edited, at least until you saved it. This stale position interferes with user inputs as well (see video).

This fixed it by reading from the buffer just like completion, etc. See rescript-lang/rescript-vscode#1179

Before/After.

Screen.Recording.2026-02-22.at.10.55.28.AM.mov

Screen.Recording.2026-02-22.at.11.04.41.AM.mov

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commit: 31658a3

[cknitt]

Nice! 🎉 Good to go? Could you add a CHANGELOG entry?

[shulhi]

Nice! 🎉 Good to go? Could you add a CHANGELOG entry?

It is considered as breaking change depending on the LSP extension you're using. I explained more in rescript-lang/rescript-vscode#1179

I'm not exactly sure how we want to tackle this. On the plus side, I've been using this fix on my work stuff and it is such an improvement.

@zth @nojaf what do you think?

[nojaf]

Could you add some more code comments on what the context of this fix is?