Alice Mikhaylenko authored Feb 04, 2021 and Adrien Plazas committed Feb 19, 2021

In some cases we may get event with very low delta at the end of the swipe.
While we can't completely ignore them, we can smooth them using a scroll
history, similarly to what GTK kinetic scrolling does: keep track of the
last 150ms of events, and sum their deltas when calculating the velocity.