This bug was fixed in the package qtmir - 0.4.8+16.10.20160810-0ubuntu1

---------------
qtmir (0.4.8+16.10.20160810-0ubuntu1) yakkety; urgency=medium

  [ Alan Griffiths ]
  * Reduce MirServer to an implementation detail of QMirServer (nothing
    else needs to touch it).

  [ Albert Astals Cid ]
  * Improvements from running clazy over the code
  * Compile with clang

  [ Daniel d'Andrada ]
  * Remove Application.stage and RoleStage from ApplicationManager

  [ Daniel van Vugt ]
  * Fix incorrect mouse wheel/touchpad scrolling scale (LP: #1607240)
    (LP: #1607223, #1607240)

 -- Michał Sawicz <michal.saw...@canonical.com>  Wed, 10 Aug 2016
06:53:16 +0000

** Changed in: qtmir (Ubuntu)
       Status: Fix Committed => Fix Released

** Changed in: qtubuntu (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1607223

Title:
  Two-finger touchpad scrolling is not accurate in apps under Unity8
  (but is in Mir demo servers)

Status in Canonical System Image:
  Fix Committed
Status in QtMir:
  Fix Committed
Status in qtubuntu:
  Fix Committed
Status in qtmir package in Ubuntu:
  Fix Released
Status in qtubuntu package in Ubuntu:
  Fix Released

Bug description:
  Smooth two-finger touchpad scrolling is not accurate in apps under
  Unity8 (but is in Mir demo servers).

  The reason appears to be because QtMir drops the nice float vscroll
  precision that Mir gives it and converts that into an int with very
  limited resolution:

      void handleWheelEvent(ulong timestamp, QPoint angleDelta,
  Qt::KeyboardModifiers mods) override

  QPoint is a pair of integers, but touchpad v/hscroll values are
  floats.

  I have only just discovered that although my new smooth scrolling
  support about to land in Xmir works in Mir's demo servers, it doesn't
  work when I run the same binaries under Unity8.

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