ISSUE-4598 load from datalessJSON for svg groups is broken (#5970)

src/shapes/group.class.js

@@ -568,7 +568,19 @@
    * @param {Function} [callback] Callback to invoke when an group instance is created
    */
   fabric.Group.fromObject = function(object, callback) {
-    fabric.util.enlivenObjects(object.objects, function(enlivenedObjects) {
+    var objects = object.objects,
+        options = fabric.util.object.clone(object, true);
+    delete options.objects;
+    if (typeof objects === 'string') {
+      // it has to be an url or something went wrong.
+      fabric.loadSVGFromURL(objects, function (elements) {
+        var group = fabric.util.groupSVGElements(elements, object, objects);
+        group.set(options);
+        callback && callback(group);
+      });
+      return;
+    }
+    fabric.util.enlivenObjects(objects, function(enlivenedObjects) {
       fabric.util.enlivenObjects([object.clipPath], function(enlivedClipPath) {
         var options = fabric.util.object.clone(object, true);
         options.clipPath = enlivedClipPath[0];

test/unit/group.js

@@ -444,6 +444,21 @@
     });
   });
 
+  QUnit.test('fromObject with svg url', function(assert) {
+    var done = assert.async();
+    var url = 'data:image/svg+xml,%3csvg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="612px" height="502.174px" viewBox="0 65.326 612 502.174" enable-background="new 0 65.326 612 502.174" xml:space="preserve"%3e %3cellipse fill="%23C6C6C6" cx="283.5" cy="487.5" rx="259" ry="80"/%3e %3cpath id="bird" d="M210.333%2c65.331C104.367%2c66.105-12.349%2c150.637%2c1.056%2c276.449c4.303%2c40.393%2c18.533%2c63.704%2c52.171%2c79.03 c36.307%2c16.544%2c57.022%2c54.556%2c50.406%2c112.954c-9.935%2c4.88-17.405%2c11.031-19.132%2c20.015c7.531-0.17%2c14.943-0.312%2c22.59%2c4.341 c20.333%2c12.375%2c31.296%2c27.363%2c42.979%2c51.72c1.714%2c3.572%2c8.192%2c2.849%2c8.312-3.078c0.17-8.467-1.856-17.454-5.226-26.933 c-2.955-8.313%2c3.059-7.985%2c6.917-6.106c6.399%2c3.115%2c16.334%2c9.43%2c30.39%2c13.098c5.392%2c1.407%2c5.995-3.877%2c5.224-6.991 c-1.864-7.522-11.009-10.862-24.519-19.229c-4.82-2.984-0.927-9.736%2c5.168-8.351l20.234%2c2.415c3.359%2c0.763%2c4.555-6.114%2c0.882-7.875 c-14.198-6.804-28.897-10.098-53.864-7.799c-11.617-29.265-29.811-61.617-15.674-81.681c12.639-17.938%2c31.216-20.74%2c39.147%2c43.489 c-5.002%2c3.107-11.215%2c5.031-11.332%2c13.024c7.201-2.845%2c11.207-1.399%2c14.791%2c0c17.912%2c6.998%2c35.462%2c21.826%2c52.982%2c37.309 c3.739%2c3.303%2c8.413-1.718%2c6.991-6.034c-2.138-6.494-8.053-10.659-14.791-20.016c-3.239-4.495%2c5.03-7.045%2c10.886-6.876 c13.849%2c0.396%2c22.886%2c8.268%2c35.177%2c11.218c4.483%2c1.076%2c9.741-1.964%2c6.917-6.917c-3.472-6.085-13.015-9.124-19.18-13.413 c-4.357-3.029-3.025-7.132%2c2.697-6.602c3.905%2c0.361%2c8.478%2c2.271%2c13.908%2c1.767c9.946-0.925%2c7.717-7.169-0.883-9.566 c-19.036-5.304-39.891-6.311-61.665-5.225c-43.837-8.358-31.554-84.887%2c0-90.363c29.571-5.132%2c62.966-13.339%2c99.928-32.156 c32.668-5.429%2c64.835-12.446%2c92.939-33.85c48.106-14.469%2c111.903%2c16.113%2c204.241%2c149.695c3.926%2c5.681%2c15.819%2c9.94%2c9.524-6.351 c-15.893-41.125-68.176-93.328-92.13-132.085c-24.581-39.774-14.34-61.243-39.957-91.247 c-21.326-24.978-47.502-25.803-77.339-17.365c-23.461%2c6.634-39.234-7.117-52.98-31.273C318.42%2c87.525%2c265.838%2c64.927%2c210.333%2c65.331 z M445.731%2c203.01c6.12%2c0%2c11.112%2c4.919%2c11.112%2c11.038c0%2c6.119-4.994%2c11.111-11.112%2c11.111s-11.038-4.994-11.038-11.111 C434.693%2c207.929%2c439.613%2c203.01%2c445.731%2c203.01z"/%3e %3c/svg%3e';
+    var groupObject = {
+      left: 10,
+      top: 10,
+      objects: url
+    };
+    fabric.Group.fromObject(groupObject, function(newGroupFromObject) {
+      assert.equal(newGroupFromObject.sourcePath, url, 'the url is copied in sourcePath');
+      assert.equal(newGroupFromObject._objects.length, 2, '2 objects are created');
+      done();
+    });
+  });
+
   QUnit.test('toSVG', function(assert) {
     var group = makeGroupWith2Objects();
     assert.ok(typeof group.toSVG === 'function');