[Bug] Symbol Text Doesn't Respect Stacking When Overidden
If you override a symbol's text that has vertical spacing set, I would expect it to push up or down once the text length changes. Below, I have an example of a symbol that has a stacked set of copy. If you change the middle block, it does not push down the third text element when it moves from being one line to many.

![screen shot 2018-02-26 at 11 02 09 am](https://user-images.githubusercontent.com/717668/36681547-ebc42a1c-1ae6-11e8-8c12-659db28ce148.png)
