HdyPaginator should support mouse scrolling
Another one of those "I thought there was already an issue".
While it's possible to drag, so mouse users aren't technically left out, there really needs to be scrolling support.
We need to be careful to avoid repeating gnome-shell mistakes though, with scrolling being hard to use.
There are 2 problems here:
- How to do it so that it feels natural. Though in my experience, a simple non-interactive scrolling + timeout works here
- Mice often only support vertical scrolling. Devices such as trackpoints support horizontal with no problems. While it's straightforward for vertical orientation, having e.g. vertical scrolling on mice and horizontal on trackpoints might be kinda confusing.