vim-patch:7.4.1658

Problem:    A plugin does not know when VimEnter autocommands were already
            triggered.
Solution:   Add the v:vim_did_enter variable.

1473551a44

src/nvim/main.c

@@ -511,6 +511,7 @@ int main(int argc, char **argv)
   if (p_im)
     need_start_insertmode = TRUE;
 
+  set_vim_var_nr(VV_VIM_DID_ENTER, 1L);
   apply_autocmds(EVENT_VIMENTER, NULL, NULL, FALSE, curbuf);
   TIME_MSG("VimEnter autocommands");