"Fixed" width option for things like dividers.
I'm unsure whether this is already added and I'm just unaware of how it works, so I'm unsure of whether to mark this as bug or suggestion.

What I'm trying to achieve;
Top = Default Symbol
Bottom = Symbol with override
![image](https://user-images.githubusercontent.com/34422459/40977889-c8935b5a-6904-11e8-9c20-b45ee27a2dc4.png)

However, it seems that when using a Paddy inside of a symbol, it causes the actual symbol to shrink/grow in width, so you are left with the result below.
![image](https://user-images.githubusercontent.com/34422459/40977970-fd4d7f92-6904-11e8-83b8-448d427c1f19.png)

I've tried playing around with the 'Resizing' modifiers inside the symbol since I suspected that might fix it if the line itself had a fixed width, but no. It still resizes.

If this is already in paddy, some clarification would be great. Otherwise consider this a feature request. :)
