Fixed undoMove feature in ChessEngine

schach/src/main/java/de/hs_mannheim/informatik/chess/model/ChessEngine.java

@@ -23,7 +23,13 @@ public class ChessEngine {
         Move libMove = new Move(Square.valueOf(from), Square.valueOf(to));
         if (board.legalMoves().contains(libMove)) {
             board.doMove(libMove);
-            moves.add(libMove); // <-- hier merken!
+
+            //Replay? Dann abschneiden
+            if (currentMoveIndex < moves.size()) {
+                moves = new ArrayList<>(moves.subList(0, currentMoveIndex));
+            }
+            moves.add(libMove);
+            currentMoveIndex++;
             return true;
         }
         return false;