Worth mentioning Flickable's mouse wheel support is also pretty poor. If
you move the wheel too quickly the Flickable may ignore the movement
completely. If you move the wheel slowly that can make the scrolling go
much faster.

Mouse wheels are relevant because it's the same code path as touchpad
scrolling. High precision touchpad scrolling just emits smaller
fractional values (float/QReal) of what would be a mouse wheel
increment. And it works great everywhere except for Qt Flickable, which
Unity8 uses a lot. :)

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src in Ubuntu.
https://bugs.launchpad.net/bugs/1605513

Title:
  Touchpad scrolling in Flickables is disproportionately faster than
  mouse wheel scrolling

Status in Canonical System Image:
  Confirmed
Status in qtdeclarative-opensource-src package in Ubuntu:
  Confirmed
Status in unity8 package in Ubuntu:
  Invalid

Bug description:
  Touchpad scrolling in dash and system settings is disproportionately
  faster than mouse wheel scrolling

  I can only say this with confidence today because I implemented
  accurate smooth scrolling in Xmir yesterday, so I know how it should
  behave.

  It's possible QtMir is overreacting to the large number of events that
  touchpads generate compared to a mouse wheel, without taking into
  account the scroll magnitude of each one is smaller.

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