fixed dirty (#3782)

src/shapes/object.class.js

@@ -1083,6 +1083,10 @@
         this.dirty = true;
       }
 
+      if (this.group && this.stateProperties.indexOf(key) > -1) {
+        this.group.set('dirty', true);
+      }
+
       if (key === 'width' || key === 'height') {
         this.minScaleLimit = Math.min(0.1, 1 / Math.max(this.width, this.height));
       }

src/shapes/rect.class.js

@@ -13,6 +13,9 @@
   var stateProperties = fabric.Object.prototype.stateProperties.concat();
   stateProperties.push('rx', 'ry');
 
+  var cacheProperties = fabric.Object.prototype.cacheProperties.concat();
+  cacheProperties.push('rx', 'ry');
+
   /**
    * Rectangle class
    * @class fabric.Rect
@@ -50,11 +53,7 @@
      */
     ry:   0,
 
-    /**
-     * Used to specify dash pattern for stroke on this object
-     * @type Array
-     */
-    strokeDashArray: null,
+    cacheProperties: cacheProperties,
 
     /**
      * Constructor

test/unit/group.js

@@ -538,6 +538,17 @@
     equal(g1.dirty, true, 'Group has dirty flag set');
   });
 
+  test('dirty flag propagation from children up with', function() {
+    var g1 = makeGroupWith4Objects();
+    var obj = g1.item(0);
+    g1.dirty = false;
+    obj.dirty = false;
+    equal(g1.dirty, false, 'Group has no dirty flag set');
+    obj.set('angle', 5);
+    equal(obj.dirty, false, 'Obj has dirty flag still false');
+    equal(g1.dirty, true, 'Group has dirty flag set');
+  });
+
   test('_getCacheCanvasDimensions returns dimensions and zoom for cache canvas are influenced by group', function() {
     var g1 = makeGroupWith4Objects();
     var obj = g1.item(0);

test/unit/rect.js

@@ -53,6 +53,13 @@
     ok(typeof rect.complexity == 'function');
   });
 
+  test('cache properties', function() {
+    var rect = new fabric.Rect();
+
+    ok(rect.cacheProperties.indexOf('rx') > -1, 'rx is in cacheProperties array');
+    ok(rect.cacheProperties.indexOf('ry') > -1, 'ry is in cacheProperties array');
+  });
+
   test('toObject', function() {
     var rect = new fabric.Rect();
     ok(typeof rect.toObject == 'function');