tracking: reduce memory load on aura change

modules/tracking.lua

@@ -3,6 +3,13 @@ pfUI:RegisterModule("tracking", function ()
   MiniMapTrackingFrame:UnregisterAllEvents()
   MiniMapTrackingFrame:Hide()
 
+  local function HasEntries(tbl)
+    for _ in pairs(tbl) do
+      return true
+    end
+    return nil
+  end
+
   local config = {
       border = C.appearance.border.default,
       size = tonumber(C.appearance.minimap.tracking_size),
@@ -71,7 +78,7 @@ pfUI:RegisterModule("tracking", function ()
     elseif not texture then
       state.texture = nil
 
-      if config.pulse and table.getn(state.spells) > 0 then
+      if config.pulse and HasEntries(state.spells) then
         this.pulse = true
         this.icon:SetTexture("Interface\\Icons\\INV_Misc_QuestionMark")
         this.icon:SetVertexColor(1,1,1,1)
@@ -126,28 +133,37 @@ pfUI:RegisterModule("tracking", function ()
     local _, playerClass = UnitClass("player")
     local isCatForm = pfUI.tracking:PlayerIsDruidInCatForm(playerClass)
 
-    state.spells = {}
     for tabIndex = 1, GetNumSpellTabs() do
       local _, _, offset, numSpells = GetSpellTabInfo(tabIndex)
       for spellIndex = offset + 1, offset + numSpells do
         local spellTexture = GetSpellTexture(spellIndex, BOOKTYPE_SPELL)
-        for _, c in pairs({"any", playerClass}) do
-          for _, t in pairs(knownTrackingSpellTextures[c] or {}) do
-            if c == "DRUID" and not isCatForm then
-              break
-            end
-            if strfind(spellTexture, t) then
-              table.insert(state.spells, {
+
+        for _, texture in pairs(knownTrackingSpellTextures["any"]) do
+          if strfind(spellTexture, texture) and not state.spells[texture] then
+            state.spells[texture] = {
+              index = spellIndex,
+              name = GetSpellName(spellIndex, BOOKTYPE_SPELL),
+              texture = spellTexture
+            }
+          end
+        end
+
+        for _, texture in pairs(knownTrackingSpellTextures[playerClass]) do
+          if strfind(spellTexture, texture) and not state.spells[texture] then
+              state.spells[texture] = {
                 index = spellIndex,
                 name = GetSpellName(spellIndex, BOOKTYPE_SPELL),
                 texture = spellTexture
-              })
-              break
-            end
+              }
           end
         end
       end
     end
+
+    -- remove humanoid tracking for non-cat druids
+    if playerClass == "DRUID" and not isCatForm then
+      state.spells["Ability_Tracking"] = nil
+    end
   end
 
   function pfUI.tracking:PlayerIsDruidInCatForm(playerClass)