To solve _this_bug_ as the description states it is probably much simpler:
We should scale the number of integer wheel events sent to Qt according to the 
float magnitude of the Mir vscroll axis. So QtMir should accumulate vscroll 
values as a float and only emit them to Qt each time that value ticks over an 
integer value.

That will correct the relative scrolling distances being
disproportionate between mice and touchpads.

** Changed in: qtmir (Ubuntu)
     Assignee: (unassigned) => Daniel van Vugt (vanvugt)

** Also affects: qtmir
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1605513

Title:
  Touchpad scrolling is disproportionately faster than mouse wheel
  scrolling

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