declare builtin changes to reject -i when used with -n; readline changes to make control characters visible in search strings; readline signal handling changes to avoid data corruption and UAF; documentation updates for more consistent quoting

lib/readline/text.c

@@ -2026,12 +2026,12 @@ _rl_readstr_init (int pchar, int flags)
   rl_end = rl_point = 0;
 
   p = _rl_make_prompt_for_search (pchar ? pchar : '@');
+
+  RL_SETSTATE (RL_STATE_READSTR);
   cxt->flags |= READSTR_FREEPMT;
   rl_message ("%s", p);
   xfree (p);
 
-  RL_SETSTATE (RL_STATE_READSTR);
-
   _rl_rscxt = cxt;  
 
   return cxt;