Enable redo using CMD+SHIFT+Z

	switch(event.charCode)
	{
            case 90:      // Z
            case 122:    // z
                /* pre-Argo and on the mac then ignoreNextTextEvent */
                if (!Configuration.playerEnablesArgoFeatures && isMac) {
                    ignoreNextTextEvent = true;
                }
  
                if (event.shiftKey) {
                    redo();
                    event.preventDefault();
  
                } else {
                    undo();
                    event.preventDefault();
                }
  
                break;