end } on \SI commands with ^ is highlighted as texGroupError

[imyxh]

Description

First of all, thank you for this wonderful package! I just have a small cosmetic bug to file—the closing bracket on \SI commands, when the command has a ^ in it, is highlighted as texGroupError despite being valid syntax.

Steps to reproduce

Minimal vimrc:

call plug#begin('~/.local/share/nvim/plugged')
Plug 'lervag/vimtex'
" interestingly enough, the above line does make a difference!
call plug#end()

The following .tex file shows the behavior for me:

\documentclass{article}

\usepackage[fleqn]{amsmath}
\usepackage{siunitx}

\begin{document}

\begin{gather*}
	c = \SI{299792458}{m.s^{-1}}
\end{gather*}

\end{document}

Expected behavior

No response

Actual behavior

See below; the last } on line 9 is highlighted despite being perfectly valid syntax.

One weird thing is that if I remove the Plug 'lervag/vimtex' from my vimrc, the highlighting error shifts to the ^, which is now highlighted with texOnlyMath:

Do you use a latexmkrc file?

No

VimtexInfo

System info
  OS: Arch Linux
  Vim version: NVIM v0.5.0
  Has clientserver: true
  Servername: /tmp/nvimg3cv04/0

VimTeX project: test
  base: test.tex
  root: /home/imyxh/git/wesleyan-courses/ASTR155/hw1
  tex: /home/imyxh/git/wesleyan-courses/ASTR155/hw1/test.tex
  out: /home/imyxh/git/wesleyan-courses/ASTR155/hw1/test.pdf
  log: /home/imyxh/git/wesleyan-courses/ASTR155/hw1/test.log
  aux: /home/imyxh/git/wesleyan-courses/ASTR155/hw1/test.aux
  fls: /home/imyxh/git/wesleyan-courses/ASTR155/hw1/test.fls
  main parser: current file verified
  compiler: latexmk
    configuration: 
      continuous: 1
      callback: 1
      latexmk options:
        -verbose
        -file-line-error
        -synctex=1
        -interaction=nonstopmode
      latexmk engine: -pdf
    job: 5
    pid: 3960288
    cmd: max_print_line=2000 latexmk -verbose -file-line-error -synctex=1 -interaction=nonstopmode -pdf -pvc -e '$pdf_previewer = "evince"' -e '$success_cmd = "echo vimtex_compiler_callback_success"' -e '$failure_cmd = "echo vimtex_compiler_callback_failure"' 'test.tex'
  viewer: General
  qf: LaTeX logfile
    root: /home/imyxh/git/wesleyan-courses/ASTR155/hw1
    addqflist: 57
    errorformat_saved: 
    fix_paths: 58
    main: /home/imyxh/git/wesleyan-courses/ASTR155/hw1/test.tex
    set_errorformat: 56
  document class: article
  packages:
    amsbsy
    amsgen
    amsmath
    amsopn
    amstext
    array
    expl3
    keyval
    l3keys2e
    siunitx
    translator
    xparse
    xparse-2020-10-01

[imyxh]

In other words, when I have Plug 'lervag/vimtex' in my vimrc, then:
{ in SI unit arguments are recognized as texSIArgUnit, but } are recognized as texDelim, causing any future } to be seen as unmatched end brackets and highlighted as syntax errors.

If I do not have Plug 'lervag/vimtex' in my vimrc, then:
^ in SI unit arguments is recognized as texOnlyMath and highlighted as a syntax error.

[lervag]

I think it should work now; please update and test.

[imyxh]

Thank you so much! It works perfectly now :)

[lervag]

Happy to hear it!