Retain pet buffs/debuffs/spells when pet is resummoned after lagout/flightpath unsummon

Research and patch by Liberate (minor assist by click)
Fixes issue #689
Fixes issue #794
Fixes issue #1454

--HG--
branch : trunk

src/game/Pet.cpp

@@ -378,6 +378,9 @@ void Pet::SavePetToDB(PetSaveMode mode)
     uint32 curhealth = GetHealth();
     uint32 curmana = GetPower(POWER_MANA);
 
+    // save auras before possibly removing them
+    _SaveAuras();
+
     // stable and not in slot saves
     if (mode > PET_SAVE_AS_CURRENT)
     {
@@ -386,7 +389,6 @@ void Pet::SavePetToDB(PetSaveMode mode)
 
     _SaveSpells();
     _SaveSpellCooldowns();
-    _SaveAuras();
 
     // current/stable/not_in_slot
     if (mode >= PET_SAVE_AS_CURRENT)
@@ -1261,7 +1263,8 @@ void Pet::_SaveAuras()
 
     for (AuraMap::const_iterator itr = m_ownedAuras.begin(); itr != m_ownedAuras.end() ; ++itr)
     {
-        if (!itr->second->CanBeSaved())
+        // check if the aura has to be saved
+        if (!itr->second->CanBeSaved() || IsPetAura(itr->second))
             continue;
 
         Aura * aura = itr->second;
@@ -1935,6 +1938,24 @@ void Pet::CastPetAura(PetAura const* aura)
         CastSpell(this, auraId, true);
 }
 
+bool Pet::IsPetAura(Aura const* aura)
+{
+    Unit* owner = GetOwner();
+
+    if (!owner || owner->GetTypeId() != TYPEID_PLAYER)
+        return false;
+
+    for (uint8 i = 0; i < MAX_SPELL_EFFECTS; ++i)
+    {
+        PetAura const* pa = spellmgr.GetPetAura(aura->GetId(),i);
+
+        // if the owner has that pet aura, return true
+        if (owner->m_petAuras.find(pa) != m_petAuras.end())
+            return true;
+    }
+    return false;
+}
+
 void Pet::learnSpellHighRank(uint32 spellid)
 {
     learnSpell(spellid);

src/game/Pet.h

@@ -186,6 +186,7 @@ class Pet : public Guardian
         void LearnPetPassives();
         void CastPetAuras(bool current);
         void CastPetAura(PetAura const* aura);
+        bool IsPetAura(Aura const* aura);
 
         void _LoadSpellCooldowns();
         void _SaveSpellCooldowns();