move pieces even with null speed

src/Taquin.gd

@@ -72,14 +72,8 @@ func _ready() -> void:
 	$Background.rect_size.y = height
 	
 	rng.randomize()
-
-	var pieces_order: Array = []
-	for order in range(1, rows * columns + 1):
-		pieces_order.append(order)
-	var hidden_piece = rows * columns # Last piece is hidden
 	
-	init(pieces_order, hidden_piece)
-	shuffle(difficulty, 0.0)
+	new_game("normal")
 
 func _input(event):
 	if $AnimationPlayer.is_playing():
@@ -231,8 +225,10 @@ func move_piece(direction, speed: float) -> bool:
 		moving_piece_animation.track_set_key_value(moving_piece_track_index, 1, missing_piece.position)
 		$AnimationPlayer.play("MovingPiece")
 	else:
+		var previous_position = current_sliding_piece.position
+		current_sliding_piece.position = missing_piece.position
+		missing_piece.position = previous_position
 		commit_slide(false, false)
-		update()
 
 	return true
 
@@ -252,6 +248,7 @@ func commit_slide(audio: bool, check_solved: bool):
 
 	ensure_validity()
 	reset_slide()
+	update()
 	if check_solved:
 		check_solved()
 
@@ -364,7 +361,7 @@ func init(pieces_order: Array, hidden_piece: int) -> void:
 		for c in range(pieces.size()):
 			for r in range(pieces[c].size()):
 				var piece: Piece = pieces[c][r].queue_free()
-	pieces.clear()
+		pieces.clear()
 
 	for c in range(columns):
 		var pieces_row: Array = []
@@ -401,22 +398,9 @@ func init(pieces_order: Array, hidden_piece: int) -> void:
 
 		pieces.append(pieces_row)
 
-#
-# Signals
-#
-func _on_Timer_timeout():
-	transition_to(State.GAME_OVER)
-
-func _on_AnimationPlayer_animation_finished(anim_name):
-	match anim_name:
-		"MovingPiece":
-			commit_slide(true, true)
-			update()
-			check_solved()
-
-func _on_NewGamePanel_start_triggered(preferences):
-	var difficulty = preferences.get_value("game", "difficulty", "normal")
-	match difficulty:
+func new_game(difficulty_mode: String) -> void:
+	print_debug("difficulty mode: ", difficulty_mode)
+	match difficulty_mode:
 		"easy":
 			rows = 3
 			columns = 3
@@ -441,3 +425,18 @@ func _on_NewGamePanel_start_triggered(preferences):
 	var hidden_piece = rows * columns # Last piece is hidden
 	init(pieces_order, hidden_piece)
 	shuffle(difficulty, 0.0)
+
+#
+# Signals
+#
+func _on_Timer_timeout():
+	transition_to(State.GAME_OVER)
+
+func _on_AnimationPlayer_animation_finished(anim_name):
+	match anim_name:
+		"MovingPiece":
+			commit_slide(true, true)
+
+func _on_NewGamePanel_start_triggered(preferences):
+	var difficulty_mode = preferences.get_value("game", "difficulty", "normal")
+	new_game(difficulty_mode)