fix typo; don't point from an item to itself

cockatrice/src/arrowitem.cpp

@@ -32,14 +32,18 @@ void ArrowItem::updatePath(const QPointF &endPoint)
 	QLineF line(startPoint, endPoint);
 	qreal lineLength = line.length();
 	
-	path = QPainterPath(QPointF(0, -arrowWidth / 2));
-	path.lineTo(0, arrowWidth / 2);
-	path.lineTo(lineLength - headLength, arrowWidth / 2);
-	path.lineTo(lineLength - headLength, headWidth / 2);
-	path.lineTo(lineLength, 0);
-	path.lineTo(lineLength - headLength, -headWidth / 2);
-	path.lineTo(lineLength - headLength, -arrowWidth / 2);
-	path.lineTo(0, -arrowWidth / 2);
+	if (lineLength < headLength)
+		path = QPainterPath();
+	else {
+		path = QPainterPath(QPointF(0, -arrowWidth / 2));
+		path.lineTo(0, arrowWidth / 2);
+		path.lineTo(lineLength - headLength, arrowWidth / 2);
+		path.lineTo(lineLength - headLength, headWidth / 2);
+		path.lineTo(lineLength, 0);
+		path.lineTo(lineLength - headLength, -headWidth / 2);
+		path.lineTo(lineLength - headLength, -arrowWidth / 2);
+		path.lineTo(0, -arrowWidth / 2);
+	}
 	
 	setPos(startPoint);
 	setTransform(QTransform().rotate(-line.angle()));
@@ -79,7 +83,7 @@ void ArrowDragItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
 
 void ArrowDragItem::mouseReleaseEvent(QGraphicsSceneMouseEvent * /*event*/)
 {
-	if (targetItem) {
+	if (targetItem && (targetItem != startItem)) {
 		CardZone *startZone = static_cast<CardZone *>(startItem->parentItem());
 		CardZone *targetZone = static_cast<CardZone *>(targetItem->parentItem());
 		startZone->getPlayer()->client->createArrow(

cockatrice/src/player.h

@@ -42,7 +42,7 @@ public slots:
 	void actShuffle();
 	void actDrawCard();
 	void actDrawCards();
-        void actMuligan();
+        void actMulligan();
 
 	void actViewLibrary();
 	void actViewTopCards();

servatrice/src/serversocket.cpp

@@ -581,7 +581,7 @@ ReturnMessage::ReturnCode ServerSocket::cmdCreateArrow(const QList<QVariant> &pa
 		return ReturnMessage::ReturnContextError;
 	Card *startCard = startZone->getCard(params[2].toInt(), false);
 	Card *targetCard = targetZone->getCard(params[5].toInt(), false);
-	if (!startCard || !targetCard)
+	if (!startCard || !targetCard || (startCard == targetCard))
 		return ReturnMessage::ReturnContextError;
 	
 	emit broadcastEvent(QString("create_arrow|%1|%2|%3|%4|%5|%6")