fix steps

app/src/main/java/gui/menu/SudokuView.java

@@ -1,5 +1,7 @@
 package gui.menu;
 
+import java.util.ArrayList;
+import java.util.List;
 import java.util.concurrent.CancellationException;
 
 import gui.widget.SudokuRenderer;
@@ -11,6 +13,7 @@ import sudoku.solver.HintHelper;
 import sudoku.solver.HumanSolver;
 import sudoku.solver.MixedSolver;
 import sudoku.solver.Solver;
+import sudoku.solver.SolverStep;
 import sudoku.solver.HintHelper.Hint;
 import sudoku.structure.MultiDoku;
 
@@ -90,8 +93,9 @@ public class SudokuView extends BaseView {
 
 	private void startSolve(Solver solver) {
 		resolveThread = new Thread(() -> {
+			List<SolverStep> steps = new ArrayList<>();
 			try {
-				unresolved = !solver.solve(this.doku);
+				unresolved = !solver.solve(this.doku, steps);
 			} catch (CancellationException e) {
 				System.out.println("The user is bored !");
 			}