Comment 27 for bug 1509776

The following sequence of operations produces the bug every time. xubuntu 16.04 as
released, default settings for touchpad. Open file manager window on directory big enough
to require scrollbar. Using touchpad move mouse pointer onto scrollbar slider. Press
and hold down left (pad) button. Using right finger on touchpad operate scroll slider.
So far all operates correctly. Remove R finger from touchpad to stop scroll but still
holding down L button. Replace R finger on touchpad to resume scrolling and mouse
pointer jumps to the right, often to the screen edge. If before replacing the R finger
the L button is released and repressed scrolling can be resumed correctly.