[BUG] Text Box WIDTH in Symbols Is Not Respected - Autoresizes Arbitrarily
In Sketch, when adding text to our artboard we can create either free text layers (by clicking with the text tool), or **text boxes** (by dragging instead of clicking). The difference between the two types of layers is:

- free text layers will extend horizontally automatically when text is added, and will auto-shrink when text is removed. If you want new lines in your text you must add them manually. Free text layers have their "Alignment" in the Type Inspector set to "Auto":
<img width="216" alt="screen shot 2018-02-10 at 8 44 37 pm" src="https://user-images.githubusercontent.com/2994472/36060747-7dcfa3f0-0ea3-11e8-8a50-9ec843f8ed83.png">

- text boxes have a **set width**: as you add text, the text will auto-wrap to the width of the box, and new lines are added automatically. Text boxes have their "Alignment" in the Type Inspector set to "Fixed":
<img width="215" alt="screen shot 2018-02-10 at 8 44 13 pm" src="https://user-images.githubusercontent.com/2994472/36060755-a4b96618-0ea3-11e8-81a2-e63c7a078b7e.png">


It seems, however, that when we have a text box (with *fixed* alignment) inside a SYMBOL, Paddy does not respect the set width of the box, and automatically resizes all text boxes HORIZONTALLY to fit the text, as if they were free text layers (with *auto* alignment). This is not the native behaviour, and gives somewhat confusing results.

To make matters worse, when we add extensive text to a symbol, Paddy seems to resize the symbol arbitrarily. I setup a simple group with 1 background rectangle (with 30px padding), and 1 text box (200px wide). So the entire symbol is supposed to be 260px. I can set it up, and define the symbol without any issues. But when I place the symbol back on the page, it autoresizes it down (because it is autoresizing the text box just wide enough to fit the default text, which is small. If I add a paragraph of text with 2 or 3 lines, it resizes the box to about 410px, and I get 2 lines of text. If I add very extensive text - line, 20 lines - it resizes the box to over 2000px. 

Although we can use Paddy's width settings to *manually* set min/max/default widths, and try to limit this autoresizing, this seems cumbersome, and not what is expected by default. 