vim-patch:7.4.537 #2509

Problem:    Value of v:hlsearch reflects an internal variable.
Solution:   Make the value reflect whether search highlighting is actually
            displayed. (Christian Brabandt)

https://github.com/vim/vim/releases/tag/v7-4-537

src/nvim/vim.h

@@ -351,6 +351,6 @@ enum {
 #include "nvim/ex_cmds_defs.h"        /* Ex command defines */
 
 # define SET_NO_HLSEARCH(flag) no_hlsearch = (flag); set_vim_var_nr( \
-    VV_HLSEARCH, !no_hlsearch)
+    VV_HLSEARCH, !no_hlsearch && p_hls)
 
 #endif /* NVIM_VIM_H */