Root directory resolution doesn't respect .texlabroot or texlabroot for Tectonic projects

[dk0d]

Texlab Version: 5.12.3
Running in Neovim 0.9.5 via Mason plugin

Summary

When using Tectonic, root directory resolution doesn't respect .texlabroot or texlabroot inside of the src/ directory.

Details

For Tectonic projects, example project structure:

.git
Tectonic.toml
src/_preamble.tex
src/index.tex
src/_postamble.tex
src/section.tex
src/refs.bib

Below compiles with tectonic V2, but texlab is unable to find the section.tex file - goto-definition fails

Case A:

% src/index.tex 
...
\input{section}
...

Below, tectonic fails to build doc, but texlab resolves correctly - goto-definition works

Case B:

% src/index.tex
...
\input{src/section}
...

This also impacts bibliography and references not detected properly.

When adding .texlabroot to specify src as the document root:

• Tectonic.toml and src/.texlabroot are present - incorrectly chooses Tectonic.toml root (project root)
  • Goto def fails and bibliography not found
• Remove Tectonic.toml (or rename it), src/.texlabroot present - correctly chooses src as root
  • Goto def works and bibliography detected properly