Merge branch 'P5-1859_panorama_canvas_breaks'

src/Canvas.js

@@ -63,6 +63,7 @@ var Canvas = fabric.util.createClass(fabric.Canvas, {
             this.getViewport().reset();
         }
         this.sendToBack(this.getImage());
+        this.getImage().center();
         this.getDragbars().resetPosition();
         this.renderAll();
     },

src/DragbarHandler.js

@@ -86,7 +86,7 @@ function DragbarHandler(canvas) {
 
         _dragbars.x = new fabric.Rect($.extend({}, config.dragBar, {
             axis: 'x',
-            width: canvas.getImage().width,
+            width: canvas.getImage().width * canvas.getImage().scaleY,
             height: config.dragBar.size,
             lockMovementY: true,
             selectable: true,
@@ -99,7 +99,7 @@ function DragbarHandler(canvas) {
         _dragbars.y = new fabric.Rect($.extend({}, config.dragBar, {
             axis: 'y',
             width: config.dragBar.size,
-            height: canvas.getImage().height,
+            height: canvas.getImage().height * canvas.getImage().scaleY,
             lockMovementX: true,
             selectable: true,
             hoverCursor: 'ns-resize',