[Bug] Layer resize arbitrarily when you try to create a symbol
when you apply a paddy plugin to a group of layers and you want to convert one layer of that group into a symbol, that a layer resize arbitrarily...
![feb-15-2018 19-02-59](https://user-images.githubusercontent.com/2532631/36287507-5c1ba84c-1283-11e8-87af-ed5bea7be4d4.gif)
