fix "same value" detection in setAttr. fix #378

test/unit/shapes/Line-test.js

@@ -309,4 +309,34 @@ suite('Line', function() {
     layer2.hide();
     compareLayers(layer, layer2);
   });
+
+  test('updating points with old mutable array should trigger recalculations', function() {
+    var stage = addStage();
+    var layer = new Konva.Layer();
+
+    var points = [-25, 50, 250, -30, 150, 50];
+    var blob = new Konva.Line({
+      x: 50,
+      y: 50,
+      points: points,
+      stroke: 'blue',
+      strokeWidth: 10,
+      draggable: true,
+      closed: true,
+      tension: 1
+    });
+
+    var tensionPoints = blob.getTensionPoints();
+    points.push(250, 100);
+    blob.setPoints(points);
+
+    layer.add(blob);
+    stage.add(layer);
+
+    assert.equal(
+      tensionPoints === blob.getTensionPoints(),
+      false,
+      'calculated points should change'
+    );
+  });
 });