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2aacf7e broke error detection in kak-lsp

See original GitHub issue

After the recent updates I noticed kakoune was no longer detecting errors in elm files using this language server. Diagnostic warnings still work, but breaking errors are completely ignored. I tried the latest version of the plugin in vscode just to compare and it still works fine there. I ran a git bisect to figure out what exactly went wrong and it looks like 2aacf7e448fda9c597cd3ab085739b541452ee47 is where the issue was introduced. It also seems to affect formatting. I can work around that with kakoune’s built in format command but the error detection not working is a much bigger PITA.

Expected Behavior

error detect should work just like it did before the breaking change

Current Behavior

Errors are not detected at all when running diagnostics in kak-lsp. Warnings still get reported, so unused imports work just fine. But if I call a function that doesn’t exist, no error gets reported to the kakoune from the language-server like it used to before 2aacf7e448fda9c597cd3ab085739b541452ee47.

Steps to Reproduce (for bugs)

set kak-lsp following the readme
install a version of elm-language server before broken commit E.g 1.2.2
call a function that has no definition in an elm file and watch kak-lsp report the error
now install the latest version of elm-language-server and see how the error is no longer reported