It appears we have flaws (incorrect multiplication) in both QtMir and
our default System Settings:

1. QtMir is multiplying vscroll events by 15, and forgetting to un-
multiply them before passing them down to clients.

2. Our default System Settings (the unlabelled second slider under Mouse
& Touchpad) seems to have a default scale of around 0.5. So the vscroll
values of 15 from QtMir get converted to +7/-7 and that's what Mir apps
receive in Unity8 instead of the expected +1/-1.

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https://bugs.launchpad.net/bugs/1607240

Title:
  Unity8 default mouse wheel speed is 7.0 (it should be 1.0)

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