fusionbox/django-widgy — pull request #74 by rockymeza (2013-07-05 22:52:12+00:00)
Title: Changing the preview_template for something with a shelf results in two shelfs

![image](https://f.cloud.github.com/assets/21784/689454/6853a720-dab3-11e2-82db-34378f04cf2b.png)

The `change:preview_template` must be being fired before the code that removes the old shelf. Rerendering fixes the problem.