Closes https://github.com/ppy/osu/issues/28916.
The previous behaviour *may* have been intended, but it was honestly
quite baffling. This seems like a saner variant.
Closes https://github.com/ppy/osu/issues/28983.
While the direct cause of this is most likely mouse confine in
full-screen, it shouldn't/can't really be disabled just for this,
and I also get this on linux in *windowed* mode.
In checking other apps, adding some tolerance to this sort of
drag-scroll behaviour seems like a sane UX improvement anyways.
Touched on in https://github.com/ppy/osu/discussions/28581.
After a bit more usage of the editor I do agree with this and think that
making the fades a bit more gentle helps a lot.