Fix #310: Enable spell checking at toplevel

after/syntax/tex.vim

@@ -11,6 +11,10 @@ elseif b:current_syntax !=# 'tex'
   finish
 endif
 
+" Perform spell checking when there is no syntax
+" - This will enable spell checking e.g. in toplevel of included files
+syntax spell toplevel
+
 " {{{1 Italic font, bold font and conceals
 
 let conceal = (has('conceal') && get(g:, 'tex_conceal', 'b') =~# 'b')

test/issue/310/main.tex

@@ -0,0 +1,5 @@
+\documentclass{minimal}
+\begin{document}
+This is corrrectly spell cheked.
+\input{subfile.tex}
+\end{document}

test/issue/310/subfile.tex

@@ -0,0 +1,2 @@
+This ins't
+% but coments are