Change latex provider to luatex, closes #476

autoload/vimtex/syntax/p/varioref.vim

@@ -0,0 +1,25 @@
+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#syntax#p#varioref#load() abort " {{{1
+  if has_key(b:vimtex_syntax, 'varioref') | return | endif
+  let b:vimtex_syntax.varioref = 1
+  if get(g:, 'tex_fast', 'r') !~# 'r' | return | endif
+
+  syntax match texStatement '\\Vref\>' nextgroup=texVarioRefZone
+
+  syntax region texVarioRefZone contained matchgroup=Delimiter
+        \ start="{" end="}"
+        \ contains=@texRefGroup,texRefZone
+
+  highlight link texVarioRefZone texRefZone
+endfunction
+
+" }}}1
+
+endif