degesch: add & use strncasecmp_ascii()

degesch.c

@@ -6388,11 +6388,11 @@ complete_command (struct app_context *ctx, struct completion *data,
 		prefix = "/";
 	}
 
+	size_t word_len = strlen (word);
 	for (size_t i = 0; i < N_ELEMENTS (g_command_handlers); i++)
 	{
 		struct command_handler *handler = &g_command_handlers[i];
-		// FIXME: we want an ASCII version
-		if (!strncasecmp (word, handler->name, strlen (word)))
+		if (!strncasecmp_ascii (word, handler->name, word_len))
 			str_vector_add_owned (output,
 				xstrdup_printf ("%s%s", prefix, handler->name));
 	}