That's more or less exactly what we've done. Our SDK does have support for LSP. But, unfortunately those extensions still need to be made. Or are you talking about a generic LSP extension that is server-agnostic? That is definitely buildable, but my experience has been that the experience tends to be a lot better when customized for a particular server.
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Why not implement first class support for LSP servers, and offer extensions that wrap official LSP's?
That's more or less exactly what we've done. Our SDK does have support for LSP. But, unfortunately those extensions still need to be made. Or are you talking about a generic LSP extension that is server-agnostic? That is definitely buildable, but my experience has been that the experience tends to be a lot better when customized for a particular server.