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The GTK `--generate' option didn't validate the game parameters. It
does now.

[originally from svn r5836]

--- a/gtk.c

+++ b/gtk.c

@@ -1280,7 +1280,10 @@

             if ( (seed = strchr(params, '#')) != NULL )

                 *seed++ = '\0';

 	    thegame.decode_params(par, params);

-        } else {

+        }

+        if ((error = thegame.validate_params(par)) != NULL) {

+	    fprintf(stderr, "%s: %s\n", pname, error);

+            return 1;

         }

 	parstr = thegame.encode_params(par, FALSE);