Confirmed the wheel vscroll value received by Xmir is exactly 7.0:
vscroll = mir_pointer_event_axis_value(pev, mir_pointer_axis_vscroll);
So for each mouse wheel tick:
USC sends a vscroll value of +1/-1 to Unity8
Unity8 sends a vscroll value of +7/-7 to apps
In previous versions of Xmir, we would ignore the magnitude and convert
the 7 into 1. But now Xmir does proper smooth scrolling we need to
honour the magnitude. So a value of 7 from Unity8 now results in 7x more
scrolling.
The Xmir change is correct and we need to fix some Untiy8/Qt code
somewhere so that a mouse wheel tick is always vscroll=1.0.
--
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which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1607240
Title:
Xmir Firefox scrolling is too fast (mouse wheel) when run under Unity8
(since Xmir 2:1.18.4-1ubuntu4)
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https://bugs.launchpad.net/ubuntu/+source/qtmir/+bug/1607240/+subscriptions
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