Created attachment 102684 [details]
xorg log

On a Dell Inspiron 15 7000 series laptop with clickpad. Clicking and dragging is almost impossible because as soon as the dragging finger is lifted the cursor jumps a long distance toward the location of the clicking finger. This usually results in any attempt to click and drag jumping to the bottom left corner of the screen.

As a workaround I tried to set AreaBottomEdge to ignore the area in which I usually click. This workaround fails because AreaBottomEdge does not ignore input in the following two cases:

1) When a finger is dragged from outside of the excluded area into the excluded area the movement doesn't always stop (sometimes it just slows, sometimes it stops after some activity in the excluded area)
2) And more importantly when clicking to drag as soon as the dragging finger touches the pad then input events are sent from the clicking finger even if it is within the zone excluded by AreaBottomEdge.

So it seems to me that there are two incorrect behaviors here. First is that AreaBottomEdge does not exclude movement input in all cases. The second is that click and drag behavior does not keep movement from different points on the pad mapped to the location of the dragging cursor. For example the behavior of the Windows driver is two allow both the clicking and the dragging finger to move the pointer but the pointer never "jumps" regardless of which finger is lifted off of the pad during a drag.