[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] fix calculation of x11 scroll distances (#446)

[Tom Beckmann]

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

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