Selection Box Is not being scaled when dragged

This may be a really nit-picky bug, But when you use the selection box the texture of the box is not being scaled but stretched,

How to replicate:

1 Select a tool with a selection example: priority.

2 drag

3 observe how the edges of the box are getting stretched and squished.

Suggestion:

Since you guys said that you use Unity, the first thing came to my mind when I saw this was that I think the image type property on the image is not set to tile or sliced. Or the boarder is not defined on the sprite editor. I don't know though, its just a suggestion 

Example:

I would like to thank you guys for this game game and the weekly devcast. It always makes my Thursday!