Hide preamble in TOC not working

[petobens]

Description

vim.g.vimtex_toc_show_preamble doesn't seem to work

Steps to reproduce

1. Open nvim with the following minimal init.lua:

   local root = '/tmp/nvim-minimal'
   
   -- Set stdpaths to use root dir
   for _, name in ipairs({ 'config', 'data', 'state', 'cache' }) do
       vim.env[('XDG_%s_HOME'):format(name:upper())] = root .. '/' .. name
   end
   
   -- Bootstrap lazy
   local lazypath = root .. '/plugins/lazy.nvim'
   if not vim.loop.fs_stat(lazypath) then
       vim.fn.system({
           'git',
           'clone',
           '--filter=blob:none',
           '--single-branch',
           'https://github.com/folke/lazy.nvim.git',
           lazypath,
       })
   end
   vim.opt.runtimepath:prepend(lazypath)
   
   -- Install and configure plugins
   local plugins = {
       {
           'lervag/vimtex',
           config = function()
               vim.g.vimtex_toc_show_preamble = 0
           end,
           ft = { 'tex', 'bib' },
       },
   }
   require('lazy').setup(plugins, {
       root = root .. '/plugins',
   })

2. Edit a tex file containing

   \documentclass{article}
   \begin{document}
   
   \section{Foo}
   
   \end{document}

3. Run VimtexTocOpen

Expected behavior

After 3. above I would expect the preamble not to be seen in the TOC.

Actual behavior

There is a preamble entry in the TOC.

Do you use a latexmkrc file?

No

VimtexInfo

System info:
  OS: Arch Linux
  Vim version: NVIM v0.10.0-dev-1045+g131a1ee82d
  Has clientserver: true
  Servername: /run/user/1000/nvim.2623593.0

VimTeX project: foo
  base: foo.tex
  root: /home/pedro/Desktop
  tex: /home/pedro/Desktop/foo.tex
  main parser: current file verified
  document class: article
  compiler: latexmk
    engine: -pdf
    options:
      -verbose
      -file-line-error
      -synctex=1
      -interaction=nonstopmode
    callback: 1
    continuous: 1
    executable: latexmk
  viewer: General
  qf method: LaTeX logfile

[lervag]

First, sorry for taking so very long to answer. I've been quite busy lately with work and I've also enjoyed perhaps too many hours of playing Baldurs Gate. 😊

I've merged the PR from @julio-b which seems to resolve your issue. Thanks @julio-b, that is very much appreciated!

[petobens]

Thanks!