Ah no, I'm reading the API wrong (kudos to faenil for correcting me):
QPoint pixelDelta
is in integers, as are all QWheelEvent calculations. So that's not going to 
work without breaking Qt APIs, which is unlikely.

An alternative option might be to us Qt's support for native gesture
events - this is used on OS X. These do let Qt do Pan/Swipe gestures
with float precision.

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to unity8 in Ubuntu.
https://bugs.launchpad.net/bugs/1605513

Title:
  Touchpad scrolling is disproportionately faster than mouse wheel
  scrolling

Status in Canonical System Image:
  New
Status in qtmir package in Ubuntu:
  New
Status in unity8 package in Ubuntu:
  Invalid

Bug description:
  Touchpad scrolling is disproportionately faster than mouse wheel
  scrolling in Unity8 (web browser and system settings).

  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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