Pan not working if image is wrapped

[enekesabel]

Hello Brad,
First of all thanks for this awesome library, it's an out of the box solution for my current project.
My problem is that I have to use inline svg instead of image element (I'm creating some kind of a map). The svg is contained in a wrapper element, so my code basically looks like:
<PinchZoomPan> <div className="wrapper"> {... svg loaded by some other lib} </div> </PinchZoomPan>
Zooming works perfectly, but unfortunately pan seems to be broken.

I managed to fix this with 2 lines, but I'd appreciate if you checked the code since you have a much deeper understanding of this project than me :)
Link to PR: #10