vim-indentguides breaks yaml syntax highlighting

[campbellr]

I recently started using this plugin (and love it), but I noticed that for some reason when I have this plugin enabled it breaks the syntax highlighting in yaml files.

indentguides enabled:

indentguides disabled:

I thought this might be a neovim-specific issue, but I also see it on vim 8.0.1365.

[hsychla]

I have the same issue in Vim 8.0.1453

without:

with:

[stonevil]

Me too. Have an issues with yaml.ansible

[ZeChArtiahSaher]

+1

[ghost]

+1

[rhssk]

My guess is that the issue affects any syntax file that uses \s.

On NeoVIM v0.5.0:
foo.vim

syn match fooComment "^\s*#.*$"
hi def link fooComment Comment

init.vim:

call plug#begin()
Plug 'thaerkh/vim-indentguides'
call plug#end()

Result:

With --noplugin:

[Akulen]

From what I can tell, the line causing this issue is

vim-indentguides/plugin/indentguides.vim

Line 27 in 3152f3a

execute 'syntax match IndentGuideSpaces /^\ \+/ containedin=ALL contains=IndentGuideDraw keepend'

My best guess for now would be that yaml syntax (and https://github.com/cespare/vim-toml which is affected as well by this) condiders whitespace at the start of a line as part of a match they are trying to make, when they shouldn't and are affected by the whitespace being in a pattern match already

[ptwales]

Adding yaml and any other affected syntax to the ignore is what I'm doing for now.

let g:indentguides_ignorelist = ['yaml', 'toml']

It's not ideal because I lose indent guides on an indent dependent syntax but it's better than no syntax highlighting.

Also I don't think this plugin can punt the issue upstream, since these issue syntax definitions are bundled with vim (at least for me). Someone will have to have some sort of clever solution in this plugin.