I believe these values should be like the below.

Refer to for example here: http://xahlee.info/linux/linux_x11_mouse_button_number.html (the first scroll event is button 4). And the up-direction should be negative for Squeak. After these adjustments the behavior was correct on my machine.

To try out, ensure that you have `Smalltalk sendMouseWheelEvents: true` You can view, comment on, or merge this pull request online at:

https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/446

-- Commit Summary --

* fix calculation of x11 scroll distances

-- File Changes --

M platforms/unix/vm-display-X11/sqUnixX11.c (6)

-- Patch Links --

https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/446.patch https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/446.diff