check for slide length

game/src/Taquin.gd

@@ -23,6 +23,7 @@ var current_animation_path := "AnimationPlayer/MockPiece:position"
 
 var swipe := Vector2(0, 0)
 var is_sliding := false
+var minimum_slide_length := 5.0
 
 var current_sliding_piece: Piece = null
 var missing_piece: Piece = null
@@ -118,7 +119,10 @@ func _input(event):
 	#
 	if event is InputEventScreenDrag:
 		swipe = event.relative
-		if not is_sliding:
+		# We check that the slide to have a minimum length
+		# before detecting the direction to avoid jittering.
+		if swipe.length() > minimum_slide_length and not is_sliding:
+			print("sliding started")
 			is_sliding = true
 			current_touch_slide = Vector2.ZERO
 			var angle = swipe.angle()