Jack Chen

icon location China Qingdao

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undos and redos saved the Drawing with background and stroke image that might caused a memory increase issue

![Screen Shot 2019-03-20 at 4 29 50 PM](https://user-images.githubusercontent.com/48739899/54669972-952ee200-4b2d-11e9-84b3-0dc809e3cd84.png)