Wrong TeXMathZone result from `vimtex#syntax#stack()` about vimtex

[lervag]

I've disabled all plugins except for VimTeX with no settings and can reproduce it.

1. …

2. The result is texMathZoneX

However, it should have texMathZoneTI, shouldn't it?

Yes; in fact, VimTeX does not defined texMathZoneX at all, so this clearly indicates that you did not properly load VimTeX.

To use powerful functions in VimTeX, I've put markdown.vim in ~/.vim/plugged/vimtex/after/ftplugin, and its part of content is shown below. …

Well, this is really not how you should use VimTeX. However, in your first text and in the steps to reproduce, you did not mention markdown. Let's focus on the pure tex related issue first and only after that consider the markdown problem.

Is it a bug or I've misunderstood something? Many thanks in advance!

It is not a bug; this is related to your configuration and is very likely a misconfiguration. However, as you did not provide a minimal example or information about how you load VimTeX, it is impossible to tell.

So, can you please either provide your full configuration, or provide a minimal example as explained in the issue template?

[pilgrimlyieu]

It is not a bug; this is related to your configuration and is very likely a misconfiguration. However, as you did not provide a minimal example or information about how you load VimTeX, it is impossible to tell.

So, can you please either provide your full configuration, or provide a minimal example as explained in the issue template?

set nocompatible
filetype plugin indent on
syntax enable

call plug#begin("~/.vim/plugged")
    Plug 'lervag/vimtex', { 'for': ['tex', 'markdown'] }
call plug#end()

Here's my minimal .vimrc that can reproduce this issue (I use vim-plug by the way). VimTeX is on the latest commit.

[lervag]

Don't specify filetypes! That is, remove the for block:

call plug#begin("~/.vim/plugged")
Plug 'lervag/vimtex'
call plug#end()

I believe this may be the main cause of your issue.

[pilgrimlyieu]

Thanks a lot! I didn't read README carefully and have never noticed the note mentioned in it. Sorry to bother you!

Note: Many plugin managers provide mechanisms to lazy load plugins. Please don't use this for VimTeX! VimTeX is already lazy loaded by virtue of being a filetype plugin and by using the autoload mechanisms. There is therefore nothing to gain by forcing VimTeX to lazily load through the plugin manager.

[lervag]

That's fine; take it as a learning point - it is usually smart to read the docs :)