added test and bad snapshot

Author: asturur

test/visual/control_rendering.js

@@ -300,6 +300,33 @@
     fabricClass: 'Canvas',
   });
 
+  function controlboxFlippedXInGroup(canvas, callback) {
+    var rect = new fabric.Rect({
+      width: 90, height: 90, padding: 9, angle: 0, flipX: true,
+      cornerSize: 12, cornerColor: 'green', cornerStrokeColor: 'blue',
+      transparentCorners: false, borderScaleFactor: 3,
+      fill: 'red', top: 50, left: 35,
+    });
+    var group = new fabric.Group([rect], {
+      interactive: true,
+      subTargetCheck: true,
+    });
+    canvas.add(group);
+    canvas.setActiveObject(rect);
+    canvas.renderAll();
+    callback(canvas.lowerCanvasEl);
+  }
+
+  tests.push({
+    test: 'controlbox with flipped X in group',
+    code: controlboxFlippedXInGroup,
+    golden: 'controls11group.png',
+    percentage: 0.004,
+    width: 150,
+    height: 180,
+    fabricClass: 'Canvas',
+  });
+
   function controlboxOpacitySingle(canvas, callback) {
     var rect = new fabric.Rect({
       width: 90, height: 90, padding: 3, opacity: 0.4,