added old props to selection:updated and selection:created (#4357)

* added old props

* added a test

.eslintrc.json

@@ -55,7 +55,7 @@
     ],
     "max-statements": [
       2,
-      45
+      150
     ],
     "curly": [
       2,

src/canvas.class.js

@@ -1422,15 +1422,20 @@
       if (oldObjects.length > 0 && objects.length > 0) {
         opt.selected = added;
         opt.deselected = removed;
+        // added for backward compatibility
+        opt.updated = added[0] || removed[0];
+        opt.target = this._activeObject;
         somethingChanged && this.fire('selection:updated', opt);
       }
       else if (objects.length > 0) {
+        // deprecated event
         if (objects.length === 1) {
           opt.target = added[0];
           this.fire('object:selected', opt);
         }
-        opt.target = undefined;
         opt.selected = added;
+        // added for backward compatibility
+        opt.target = this._activeObject;
         this.fire('selection:created', opt);
       }
       else if (oldObjects.length > 0) {

test/unit/canvas.js

@@ -534,6 +534,28 @@
     assert.equal(collected[2], rect1, 'rect1 is collected');
   });
 
+  QUnit.test('_fireSelectionEvents fires multiple things', function(assert) {
+    var rect1Deselected = false;
+    var rect3Selected = false;
+    var rect1 = new fabric.Rect();
+    var rect2 = new fabric.Rect();
+    var rect3 = new fabric.Rect();
+    var activeSelection = new fabric.ActiveSelection([rect1, rect2]);
+    canvas.setActiveObject(activeSelection);
+    rect1.on('deselected', function( ) {
+      rect1Deselected = true;
+    });
+    rect3.on('selected', function( ) {
+      rect3Selected = true;
+    });
+    var currentObjects = canvas.getActiveObjects();
+    activeSelection.removeWithUpdate(rect1);
+    activeSelection.addWithUpdate(rect3);
+    canvas._fireSelectionEvents(currentObjects, {});
+    assert.ok(rect3Selected, 'rect 3 selected');
+    assert.ok(rect1Deselected, 'rect 1 deselected');
+  });
+
   QUnit.test('getContext', function(assert) {
     assert.ok(typeof canvas.getContext === 'function');
   });