21.2.b20: C-g in isearch differs from old b17 behavior

I've recently upgraded from 21.2.b17 to 21.2.b20 and I notice that C-g behaves differently during incremental search. Suppose I isearch (successfully) for "foo" and press RET to exit isearch. Next I isearch (successfully) for "bar" and use C-g to exit isearch. In b17, pressing C-s C-s would isearch for "bar"; in b20, it searches for "foo". Is this by design? I don't remember seeing mention of it on the xemacs-beta list. I notice that isearch-quit (bound by default to (ugh!) ESC ESC ESC) remembers the most recent search string. Perhaps I'll just bind isearch-quit to something more convenient (and eventually retrain my fingers). -Mark