Scrolling with mouse wheel does not work while dragging
Exactly as the title says, when you're dragging anything you can't scroll the document with the mouse wheel at the same time until you drop whatever you were dragging. Having this feature is useful if I want to drop something off page. The automatic scrolling when dragging near the edge is not always available and when available is inconsistent (sometimes crazy fast like Libreoffice, sometimes crazy slow, or sometimes the drag scroll target is too small or hard to find). Controlling it with the mouse wheel is very consistent.
Tested on Kubuntu 18.04 with Libinput and X11.