patch 8.1.1405: "highlight" option of popup windows not supported
Problem: "highlight" option of popup windows not supported.
Solution: Implement the "highlight" option.
diff --git a/src/proto/option.pro b/src/proto/option.pro
index 15aa010..4a0da1c 100644
--- a/src/proto/option.pro
+++ b/src/proto/option.pro
@@ -21,6 +21,8 @@
int set_term_option_alloced(char_u **p);
int was_set_insecurely(char_u *opt, int opt_flags);
void set_string_option_direct(char_u *name, int opt_idx, char_u *val, int opt_flags, int set_sid);
+void set_string_option_direct_in_win(win_T *wp, char_u *name, int opt_idx, char_u *val, int opt_flags, int set_sid);
+void set_string_option_direct_in_buf(buf_T *buf, char_u *name, int opt_idx, char_u *val, int opt_flags, int set_sid);
int valid_spellang(char_u *val);
char *check_colorcolumn(win_T *wp);
char *check_stl_option(char_u *s);