shapeshift detection via GetShapeshiftFormID + UPDATE_SHAPESHIFT_FORM

actionbar.lua: pageswitch now listens to UPDATE_SHAPESHIFT_FORM as the
authoritative form-change signal. PLAYER_AURAS_CHANGED becomes a
narrowly-scoped prowl-detection trigger that runs after form state is
already known. The Nampower SPELL_GO_SELF hook drops its Cat Form
(spellID 768) branch — UPDATE_SHAPESHIFT_FORM covers form changes
without per-spellID watchlists. Prowl IDs stay hooked for zero-latency
detection that PLAYER_AURAS_CHANGED can't match.

autoshift.lua: the texture-list shapeshift detection becomes a form-ID-
keyed map. GetShapeshiftFormID returns the active form directly so we
don't have to texture-match against every possible form pattern. The
moonkin_scan frame disappears entirely — its talent-conditional was a
workaround for the agility buff sharing Moonkin's icon, which form ID
makes irrelevant (form 31 is only reported when the player is genuinely
in Moonkin Form). Loop also splits into two phases for clarity: mount
priority pass, then form cancel.

modules/autoshift.lua

@@ -24,31 +24,25 @@ pfUI:RegisterModule("autoshift", "vanilla", function ()
     "根据您的骑行技能提高速度。", "根据骑术技能提高速度。", "又慢又稳......",
   }
 
+  -- Form ID -> icon-path fragment of that form's buff. GetShapeshiftFormID
+  -- tells us the active form directly; we still need to locate the buff in
+  -- the player's array to find the bid for CancelPlayerBuff.
+  --
+  -- Replaces the old texture-list scan plus moonkin_scan frame: the agility
+  -- buff that shares moonkin's icon no longer causes false positives because
+  -- form ID 31 is only reported when the player is genuinely in Moonkin Form,
+  -- regardless of what other buffs happen to be active.
   pfUI.autoshift.shapeshifts = {
-    "ability_racial_bearform", "ability_druid_catform", "ability_druid_travelform",
-    "ability_druid_aquaticform", "spell_shadow_shadowform", "spell_nature_spiritwolf",
+    [1]  = "ability_druid_catform",       -- Cat Form
+    [3]  = "ability_druid_travelform",    -- Travel Form
+    [4]  = "ability_druid_aquaticform",   -- Aquatic Form
+    [5]  = "ability_racial_bearform",     -- Bear Form
+    [8]  = "ability_racial_bearform",     -- Dire Bear (shares texture with Bear)
+    [16] = "spell_nature_spiritwolf",     -- Shaman Ghost Wolf
+    [28] = "spell_shadow_shadowform",     -- Priest Shadowform
+    [31] = "spell_nature_forceofnature",  -- Druid Moonkin
   }
 
-  -- an agility buff exists which has the same icon as the moonkin form
-  -- therefore only add the moonkin icon to the removable buffs if
-  -- moonkin is skilled and player is druid. Frame is required as talentpoints
-  -- are only accessible after certain events.
-  local moonkin_scan = CreateFrame("Frame")
-  moonkin_scan:RegisterEvent("PLAYER_ENTERING_WORLD")
-  moonkin_scan:RegisterEvent("UNIT_NAME_UPDATE")
-  moonkin_scan:SetScript("OnEvent", function()
-    local _, class = UnitClass("player")
-    if class == "DRUID" then
-      local _,_,_,_,moonkin = GetTalentInfo(1,16)
-      if moonkin == 1 then
-        table.insert(pfUI.autoshift.shapeshifts, "spell_nature_forceofnature")
-        moonkin_scan:UnregisterAllEvents()
-      end
-    else
-      moonkin_scan:UnregisterAllEvents()
-    end
-  end)
-
   pfUI.autoshift.errors = { SPELL_FAILED_NOT_MOUNTED, ERR_ATTACK_MOUNTED, ERR_TAXIPLAYERALREADYMOUNTED,
     SPELL_FAILED_NOT_SHAPESHIFT, SPELL_FAILED_NO_ITEMS_WHILE_SHAPESHIFTED, SPELL_NOT_SHAPESHIFTED,
     SPELL_NOT_SHAPESHIFTED_NOSPACE, ERR_CANT_INTERACT_SHAPESHIFTED, ERR_NOT_WHILE_SHAPESHIFTED,
@@ -71,19 +65,17 @@ pfUI:RegisterModule("autoshift", "vanilla", function ()
       return
     end
 
-    -- delay shapeshift cancel
-    local CancelLater = nil
-
     -- scan through buffs and cancel shapeshift/mount
     for id, errorstring in pairs(pfUI.autoshift.errors) do
       if arg1 == errorstring then
-        -- dont's cancel form when clicking on npcs while in combat
+        -- don't cancel form when clicking on npcs while in combat
         if arg1 == ERR_CANT_INTERACT_SHAPESHIFTED and UnitAffectingCombat("player") then
           return
         end
 
-        for i=0,31,1 do
-          -- detect mounts based on tooltip text
+        -- Phase 1: mounts take priority (mount/shapeshift can't coexist in
+        -- vanilla, but the original error list also covers mount-only states).
+        for i = 0, 31 do
           pfUI.autoshift.scanner:SetPlayerBuff(i)
           for _, str in pairs(pfUI.autoshift.mounts) do
             if pfUI.autoshift.scanner:Find(str) then
@@ -91,27 +83,19 @@ pfUI:RegisterModule("autoshift", "vanilla", function ()
               return
             end
           end
-
-          -- detect shapeshift based on texture
-          local buff = GetPlayerBuffTexture(i)
-          if buff then
-            for id, bufftype in pairs(pfUI.autoshift.shapeshifts) do
-              if string.find(string.lower(buff), bufftype, 1) then
-                if string.find(string.lower(buff), "spell_shadow_shadowform", 1) then
-                  -- only cancel shadow form if no other buff was hindering casting
-                  CancelLater = i
-                else
-                  CancelPlayerBuff(i)
-                  return
-                end
-              end
-            end
-          end
         end
 
-        -- if nothing else was found, cancel shadowform
-        if CancelLater then
-          CancelPlayerBuff(CancelLater)
+        -- Phase 2: cancel the active shapeshift if any. GetShapeshiftFormID
+        -- gives us the form directly; we iterate to find its buff bid.
+        local formTexture = pfUI.autoshift.shapeshifts[GetShapeshiftFormID()]
+        if formTexture then
+          for i = 0, 31 do
+            local buff = GetPlayerBuffTexture(i)
+            if buff and string.find(string.lower(buff), formTexture, 1) then
+              CancelPlayerBuff(i)
+              return
+            end
+          end
         end
       end
     end