fixup! s:_skip_special_chars: look at synstack

Author: blueyed

indent/python.vim

@@ -92,8 +92,9 @@ else
     endfunction
 
     function! s:_skip_special_chars(line, col)
-        return synIDattr(synID(a:line, a:col, 0), 'name')
-              \ =~? s:special_chars_syn_pattern
+        return match(map(synstack(a:line, a:col),
+              \ "synIDattr(v:val, 'name')"),
+              \ '\c'.s:special_chars_syn_pattern)
               \ || s:is_concealed(a:line, a:col)
     endfunction
 endif