Maybe we should remove panning/dragging. It is from a time when view sizes were buggy and views are required to fill the entire available size. Panning/dragging is also buggy on Avalonia (the hit detection requires you to click a non-transparent pixel requiring precise cursor movement, and you can drag out of view bounds). Now that view sizes is getting fixed (#32, #136), we should replace all uses of panning/dragging with ScrollViews.

If we are to remove panning/dragging anyways, we might as well ignore this issue for now.