Root file detection?

[dpo]

I'm using Texlab in LazyVim via nvim-texlabconfig. All is well except that the root file doesn't seem to be detected in multiple-file documents. I have

• main.tex containing

\documentclass{beamer}
\input{main-body}

• main-body.tex containing, e.g.,

\begin{frame}
  \frametitle{Test}
\end{frame}

Both are in the same directory. I opened main-body.tex in neovim from that directory, but it looks like Texlab is compiling main-body.tex instead of main.tex.

I also tried adding the good old

%%% Local Variables:
%%% mode: latex
%%% TeX-master: t
%% End:

to main.tex and

%!TEX root = main.tex

to main-body.tex, but with no more success.

If it's useful, here is the Texlab log: https://gist.github.com/dpo/4cfa26fcea04700460b241b781656039

Thank you!

[dpo]

FWIW, here is my LazyVim configuration:

  {
    "neovim/nvim-lspconfig",
    opts = {
      servers = {
        texlab = {
          -- cmd = { "texlab" },
          cmd = { "texlab", "-vvvv", "--log-file", "/tmp/texlab.log" },
          settings = {
            texlab = {
              -- rootDirectory = nil,
              build = {
                executable = "latexmk",
                args = { "-shell-escape", "-pdf", "-interaction=nonstopmode", "-synctex=1", "%f" },
                onSave = true,
                forwardSearchAfter = true,
              },
              auxDirectory = ".",
              forwardSearch = {
                executable = "/Applications/Skim.app/Contents/SharedSupport/displayline",
                args = { "-g", "-b", "%l", "%p", "%f" },
              },
              chktex = {
                onOpenAndSave = true,
                onEdit = false,
              },
              diagnosticsDelay = 300,
              latexFormatter = "none",
              bibtexFormatter = "none",
              formatterLineLength = 0,
            },
          },
        },
      },
      inlay_hints = {
        enabled = true,
        exclude = { "tex", "bib" },
      },
    },
  },
  {
    "f3fora/nvim-texlabconfig",
    config = function()
      require("texlabconfig").setup()
    end,
    build = "go build -o ~/.local/bin/",
  },