nameplates: use single event listener for all plates

modules/nameplates.lua

@@ -245,11 +245,29 @@ pfUI:RegisterModule("nameplates", "vanilla:tbc", function ()
   -- create nameplate core
   local nameplates = CreateFrame("Frame", "pfNameplates", UIParent)
   nameplates:RegisterEvent("PLAYER_ENTERING_WORLD")
+  nameplates:RegisterEvent("PLAYER_TARGET_CHANGED")
+  nameplates:RegisterEvent("UNIT_COMBO_POINTS")
+  nameplates:RegisterEvent("PLAYER_COMBO_POINTS")
+  nameplates:RegisterEvent("UNIT_AURA")
+
   nameplates:SetScript("OnEvent", function()
-    this:SetGameVariables()
+    if event == "PLAYER_ENTERING_WORLD" then
+      this:SetGameVariables()
+    else
+      this.eventcache = true
+    end
   end)
 
   nameplates:SetScript("OnUpdate", function()
+    -- propagate events to all nameplates
+    if this.eventcache then
+      this.eventcache = nil
+      for plate in pairs(registry) do
+        plate.eventcache = true
+      end
+    end
+
+    -- detect new nameplates
     parentcount = WorldFrame:GetNumChildren()
     if initialized < parentcount then
       childs = { WorldFrame:GetChildren() }
@@ -410,13 +428,6 @@ pfUI:RegisterModule("nameplates", "vanilla:tbc", function ()
     HookScript(parent, "OnShow", nameplates.OnShow)
     HookScript(parent, "OnUpdate", nameplates.OnUpdate)
 
-
-    nameplate:RegisterEvent("PLAYER_TARGET_CHANGED")
-    nameplate:RegisterEvent("UNIT_AURA")
-    nameplate:RegisterEvent("UNIT_COMBO_POINTS")
-    nameplate:RegisterEvent("PLAYER_COMBO_POINTS")
-    nameplate:SetScript("OnEvent", nameplates.OnEvent)
-
     nameplates.OnConfigChange(parent)
     nameplates.OnShow(parent)
   end
@@ -502,11 +513,6 @@ pfUI:RegisterModule("nameplates", "vanilla:tbc", function ()
     nameplates:OnDataChanged(this:GetParent().nameplate)
   end
 
-  nameplates.OnEvent = function(frame)
-    local frame = frame or this
-    frame.eventcache = true
-  end
-
   nameplates.OnDataChanged = function(self, plate)
     local visible = plate:IsVisible()
     local hp = plate.original.healthbar:GetValue()