Added PyMac_OutputSeen(), which acknowledges all current output in the stdio window, i.e. it acts like input has been read insofar as the keep-console-open option is interested.

Mac/Python/macmain.c

@@ -538,6 +538,15 @@ Py_Main(argc, argv)
 	/*NOTREACHED*/
 }
 
+/*
+** Reset the "unseen output" flag
+*/
+void
+PyMac_OutputSeen()
+{
+	gusisioux_state = GUSISIOUX_STATE_LASTREAD;
+}
+
 /*
 ** Terminate application
 */