if (windows.size() < 2 && invisible == null) {
if (!isMac && windows.size() < 2) {
	public void JSLFrameClosing(JSLFrameEvent e) {	    JSLFrame f = e.getJSLFrame();	    if (f == toolbar) {		if (windows.size() < 2 && invisible == null) { // !MacUtils.isMac()		    exitAction.actionPerformed(null);		} else {		    showState(f, "hidden. " + (windows.size() - 1)                            + " windows still open.");		}	    } else	        last_selected = null;	}