libunitscan: disable target sounds during scan

libs/libunitscan.lua

@@ -140,15 +140,26 @@ end)
 -- since TargetByName can only be triggered within vanilla,
 -- we can't auto-scan targets on further expansions.
 if pfUI.client <= 11200 then
+  -- setup sound function switches
+  local SoundOn = PlaySound
+  local SoundOff = function() return end
+
   libunitscan:SetScript("OnUpdate", function()
     -- don't scan when another unit is in target
     if UnitExists("target") or UnitName("target") then return end
 
     local name = next(queue)
     if name then
+      -- disable sound
+      _G.PlaySound = SoundOff
+
       -- try to target the unknown unit
       TargetByName(name, true)
       ClearTarget()
+
+      -- enable sound again
+      _G.PlaySound = SoundOn
+
       queue[name] = nil
     end