Feature Proposal: Inlay Hints

[kjeremy]

This is the start of an "inlay hints" feature proposal. It is essentially the interface we use in rust-analyzer to achieve inlay hints (microsoft/vscode#16221)

I am working on this in my spare time (hence just the md for now) but would like to get feedback.

[msftclas]

All CLA requirements met.

[rcjsuen]

I am working on this in my spare time (hence just the md for now) but would like to get feedback.

@kjeremy I suggest you share your proposal as an issue in the microsoft/language-server-protocol repository.

[dbaeumer]

@jrieken and @mjbvz has something like this every come up in the VS Code API. I actually do like the feature especially for inferred types.

[kjeremy]

A screen shot of this in action can be found at microsoft/vscode#16221 (comment)

[jrieken]

https://marketplace.visualstudio.com/items?itemName=sokra.ts-inline-types 👈 an extension that does this for TypeScript - tho, by creating yet another instance of the compiler

[KamasamaK]

@mjbvz I see that you locked microsoft/vscode#16221. I agree that the nature of the comments mostly amounted to noise, but locking also prevents further actual +1s on the opening post.

[mjbvz]

We are still tracking it. There were enough +1 and comments on the issue to know that it’s something users are interested in

[matklad]

Something which I believe is missing form discussion so far is that one could (but not necessary should) go beyond plain text for hints:

[Veetaha]

Maybe we should move the discussion to microsoft/language-server-protocol#956?

[dbaeumer]

Lets close this in favour of #772