Updated Hammerspoon script to scroll with right click + trackball. Tested with Logi M575

mouse.lua

-- https://github.com/tekezo/Karabiner/issues/814
-- HANDLE SCROLLING WITH MOUSE BUTTON PRESSED
local scrollMouseButton = 2
local deferred = false

overrideOtherMouseDown =
  hs.eventtap.new(
  {hs.eventtap.event.types.rightMouseDown},
  function(e)
    deferred = true
    return true
  end
)

overrideOtherMouseUp =
  hs.eventtap.new(
  {hs.eventtap.event.types.rightMouseUp},
  function(e)
    if (deferred) then
      overrideOtherMouseDown:stop()
      overrideOtherMouseUp:stop()
      hs.eventtap.rightClick(e:location(), pressedMouseButton)
      overrideOtherMouseDown:start()
      overrideOtherMouseUp:start()
      return true
    end
    return false
  end
)

local oldmousepos = {}
local scrollmult = 6 -- positive multiplier for natural scrolling
local smoothFactor = 0.5 -- Adjust this value (0 to 1) to control the smoothing effect

dragOtherToScroll =
  hs.eventtap.new(
  {hs.eventtap.event.types.rightMouseDragged},
  function(e)
    deferred = false
    oldmousepos = hs.mouse.absolutePosition()
    local dx = e:getProperty(hs.eventtap.event.properties["mouseEventDeltaX"]) * smoothFactor
    local dy = e:getProperty(hs.eventtap.event.properties["mouseEventDeltaY"]) * smoothFactor
    
    -- Get modifier keys
    local flags = e:getFlags()
    
    -- Create a scroll event with both vertical and horizontal components
    local scroll = hs.eventtap.event.newScrollEvent(
      {dx * scrollmult, dy * scrollmult},
      {},
      "pixel"
    )
    
    -- Set the flags on the scroll event to match the current modifier keys
    scroll:setFlags(flags)
    
    -- Restore the mouse position
    hs.mouse.absolutePosition(oldmousepos)
    
    return true, {scroll}
  end
)

overrideOtherMouseDown:start()
overrideOtherMouseUp:start()
dragOtherToScroll:start()

This update addresses the deprecation warning by making two changes:

1. Changed oldmousepos = hs.mouse.getAbsolutePosition() to oldmousepos = hs.mouse.absolutePosition()
2. Changed hs.mouse.setAbsolutePosition(oldmousepos) to hs.mouse.absolutePosition(oldmousepos)

These changes use the newer hs.mouse.absolutePosition function, which can both get and set the mouse position.