Neovim: using the builtin formatter erases virtual lines

How are you using the lua-language-server?

NeoVim

Which OS are you using?

Linux

What is the issue affecting?

Formatting

Expected Behaviour

Virtual lines should be preserved. Here is an example (by @whynothugo) with using StyLua as a formatter instead.

Actual Behaviour

Virtual lines get erased. The diagnostics are still there, though. Here is an example of how it looks.

Reproduction steps

1. Setup the nvim-lspconfig and lsp_lines plugins
2. Make sure you see the virtual lines, then format the code
3. Are the virtual lines still there?

Additional Notes

Both examples are demonstrated by using @WhyNotHugo's lsp_lines Neovim plugin. There is a downstream issue.

Log File

No response

使用 nvim-lspconfig 和 lsp_lines 插件重现该问题，按照列出的格式化步骤操作，并比较格式化前后的虚拟行。调查语言服务器的格式化响应和集成行为；当格式化能够保留虚拟行，同时诊断信息仍然可见时，即表示完成。