Issue: Awkward navigation

[Nenotriple]

I think the main issue is when using the mouse-wheel. Scrolling down to navigate Next/+1 or up the index feels awkward. It's a little hard to pinpoint if this is the only aspect of the issue. I think the file order also plays a part in the awkwardness.

Navigation Method	Action	Index Change
Mouse-wheel	Down	+1 index
Mouse-wheel	Up	-1 index
UI Button	Next	+1 index
UI Button	Prev	-1 index
Arrow Key	Right	+1 index
Arrow Key	Left	-1 index

Flipping the mouse-wheel binds may feel more natural.
Adding up/down arrow-key navigation would be nice.