Change latex provider to luatex, closes #476

autoload/vimtex/fold/comments.vim

@@ -0,0 +1,46 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'latex') == -1
+
+" vimtex - LaTeX plugin for Vim
+"
+" Maintainer: Karl Yngve Lervåg
+" Email:      karl.yngve@gmail.com
+"
+
+function! vimtex#fold#comments#new(config) abort " {{{1
+  return extend(deepcopy(s:folder), a:config)
+endfunction
+
+" }}}1
+
+
+let s:folder = {
+      \ 'name' : 'comments',
+      \ 're' : {'start' : '^\s*%'},
+      \ 'opened' : 0,
+      \}
+function! s:folder.level(line, lnum) abort dict " {{{1
+  if exists('b:vimtex.fold_types_dict.markers.opened')
+        \ && b:vimtex.fold_types_dict.markers.opened | return | endif
+
+  if a:line =~# self.re.start
+    let l:next = getline(a:lnum-1) !~# self.re.start
+    let l:prev = getline(a:lnum+1) !~# self.re.start
+    if l:next && !l:prev
+      let self.opened = 1
+      return 'a1'
+    elseif l:prev && !l:next
+      let self.opened = 0
+      return 's1'
+    endif
+  endif
+endfunction
+
+" }}}1
+function! s:folder.text(line, level) abort dict " {{{1
+  let l:lines = map(getline(v:foldstart, v:foldend), 'matchstr(v:val, ''%\s*\zs.*\ze\s*'')')
+  return matchstr(a:line, '^.*\s*%') . join(l:lines, ' ')
+endfunction
+
+" }}}1
+
+endif