additional tests; documentation updates

lib/readline/doc/rluser.texi

@@ -2282,6 +2282,7 @@ Names of all shell variables.  May also be specified as @option{-v}.
 @item -C @var{command}
 @var{command} is executed in a subshell environment, and its output is
 used as the possible completions.
+Arguments are passed as with the @option{-F} option.
 
 @item -F @var{function}
 The shell function @var{function} is executed in the current shell

lib/readline/isearch.c

@@ -194,7 +194,10 @@ rl_display_search (char *search_string, int flags, int where)
 
   rl_message ("%s", message);
   xfree (message);
+#if 0
+  /* rl_message calls this */
   (*rl_redisplay_function) ();
+#endif
 }
 
 static _rl_search_cxt *