rem: const revealed = action.revealedCard; if(revealed) revealed.setFaceUp(); 
add: const cs = action.revealedCards; for(var i = 0; i != cs.length; ++i) cs[i].setFaceUp(); 
context:   redo: function() {    const undone = this.actionsUndone;    const action = undone.pop();    this.actionsDone.push(action);    this.canUndo = true;    this.canRedo = undone.length != 0;    gScoreDisplay.value = this.score += action.score;    this.hintsReady = false;    if(action.redo) action.redo();    else action.perform();    const revealed = action.revealedCard;    if(revealed) revealed.setFaceUp();    if(this.redealsRemaining==0) gCmdRedeal.setAttribute("disabled","true");    if("redoNext" in action && action.redoNext) this.redo();  },
meta: 3385	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/3385/51238e4aeced596a0a6b1b1d3f980bc0d9f2ac0c/cardgame.js/clean/cardgame.js