README, dist.

README.md

@@ -478,6 +478,7 @@ Changes
 #### v0.2.7-dev (Development version)
 
 - update `destroy([detachGrid])` call ([#422](https://github.com/troolee/gridstack.js/issues/422)).
+- don't mutate options when calling `draggable` and `resizable`. ([#505](https://github.com/troolee/gridstack.js/issues/505)).
 
 #### v0.2.6 (2016-08-17)
 

dist/gridstack.js

@@ -1115,13 +1115,13 @@
         };
 
         el
-            .draggable(_.extend(this.opts.draggable, {
+            .draggable(_.extend({}, this.opts.draggable, {
                 containment: this.opts.isNested ? this.container.parent() : null,
                 start: onStartMoving,
                 stop: onEndMoving,
                 drag: dragOrResize
             }))
-            .resizable(_.extend(this.opts.resizable, {
+            .resizable(_.extend({}, this.opts.resizable, {
                 start: onStartMoving,
                 stop: onEndMoving,
                 resize: dragOrResize