Change latex provider to luatex, closes #476

autoload/vimtex/syntax/p/beamer.vim

@@ -0,0 +1,32 @@
+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#beamer#load() abort " {{{1
+  if has_key(b:vimtex_syntax, 'beamer') | return | endif
+  let b:vimtex_syntax.beamer = 1
+
+  syntax match texBeamerDelimiter '<\|>' contained
+  syntax match texBeamerOpt '<[^>]*>' contained contains=texBeamerDelimiter
+
+  syntax match texStatementBeamer '\\only\(<[^>]*>\)\?' contains=texBeamerOpt
+  syntax match texStatementBeamer '\\item<[^>]*>' contains=texBeamerOpt
+
+  syntax match texInputFile
+        \ '\\includegraphics<[^>]*>\(\[.\{-}\]\)\=\s*{.\{-}}'
+        \ contains=texStatement,texBeamerOpt,texInputCurlies,texInputFileOpt
+
+  call vimtex#syntax#misc#add_to_section_clusters('texStatementBeamer')
+
+  highlight link texStatementBeamer texStatement
+  highlight link texBeamerOpt Identifier
+  highlight link texBeamerDelimiter Delimiter
+endfunction
+
+" }}}1
+
+endif