patch 8.1.1143: may pass weird strings to file name expansion
Problem: May pass weird strings to file name expansion.
Solution: Check for matching characters. Disallow control characters.
diff --git a/src/proto/option.pro b/src/proto/option.pro
index 1027edf..15aa010 100644
--- a/src/proto/option.pro
+++ b/src/proto/option.pro
@@ -21,6 +21,7 @@
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);
+int valid_spellang(char_u *val);
char *check_colorcolumn(win_T *wp);
char *check_stl_option(char_u *s);
void set_term_option_sctx_idx(char *name, int opt_idx);