Fixes StaticCanvas.onBeforeScaleRotate not triggering when canvas is zoomed

src/mixins/canvas_events.mixin.js

@@ -573,7 +573,7 @@
       this.stateful && target.saveState();
 
       // determine if it's a drag or rotate case
-      if (target._findTargetCorner(this.getPointer(e))) {
+      if (target._findTargetCorner(this.getPointer(e, true))) {
         this.onBeforeScaleRotate(target);
       }
 

test/unit/canvas.js

@@ -2337,6 +2337,56 @@
     fabric.Canvas.prototype._onResize = originalResize;
   });
 
+  QUnit.test('_beforeTransform', function (assert) {
+    assert.ok(typeof canvas._beforeTransform === 'function');
+
+    var canvasEl = canvas.getElement(),
+        canvasOffset = fabric.util.getElementOffset(canvasEl);
+
+    var rect = new fabric.Rect({ left: 50, top: 50, width: 50, height: 50 });
+    canvas.add(rect);
+    canvas.setActiveObject(rect);
+
+    var t, counter = 0;
+    var _onBeforeScaleRotate = canvas.onBeforeScaleRotate;
+    canvas.onBeforeScaleRotate = function (target) {
+      t = target;
+      counter++;
+    };
+
+    var corners = ['tl', 'mt', 'tr', 'mr', 'br', 'mb', 'bl', 'ml', 'mtr'];
+    for (var i = 0; i < corners.length; i++) {
+      var co = rect.oCoords[corners[i]].corner;
+      var e = {
+        clientX: canvasOffset.left + (co.tl.x + co.tr.x) / 2,
+        clientY: canvasOffset.top + (co.tl.y + co.bl.y) / 2,
+        which: 1
+      };
+      canvas._beforeTransform(e, rect);
+    }
+    assert.equal(counter, corners.length, '_beforeTransform should trigger onBeforeScaleRotate for all corners');
+    assert.equal(t, rect, 'onBeforeScaleRotate should receive correct target');
+
+    canvas.zoomToPoint({ x: 25, y: 25 }, 2);
+
+    t = null;
+    counter = 0;
+    for (var i = 0; i < corners.length; i++) {
+      var c = corners[i];
+      var co = rect.oCoords[c].corner;
+      var e = {
+        clientX: canvasOffset.left + (co.tl.x + co.tr.x) / 2,
+        clientY: canvasOffset.top + (co.tl.y + co.bl.y) / 2,
+        which: 1
+      };
+      canvas._beforeTransform(e, rect);
+    }
+    assert.equal(counter, corners.length, '_beforeTransform should trigger onBeforeScaleRotate when canvas is zoomed');
+    assert.equal(t, rect, 'onBeforeScaleRotate should receive correct target when canvas is zoomed');
+
+    canvas.zoomToPoint({ x: 0, y: 0 }, 1);
+    canvas.onBeforeScaleRotate = _onBeforeScaleRotate;
+  });
 
   QUnit.test('actionIsDisabled ', function(assert) {
     assert.ok(typeof fabric.Canvas.prototype.actionIsDisabled === 'function', 'actionIsDisabled is a function');