[9850] Fixed target selection for area spells casted from aura at enemy.

* Spell::GetCastingObject must be use for selection visual/point cast,
  not for friend/enemy checks. Add extanded GetAffectiveCasterObject
  for proper provide for referecned checks wild gameobject casted case.

* Also support chain damage spells casted by gameobjects.

src/game/GridNotifiers.h

@@ -821,34 +821,36 @@ namespace MaNGOS
     class AnyAoEVisibleTargetUnitInObjectRangeCheck
     {
         public:
-            AnyAoEVisibleTargetUnitInObjectRangeCheck(WorldObject const* obj, Unit const* funit, float range)
-                : i_obj(obj), i_funit(funit), i_range(range)
+            AnyAoEVisibleTargetUnitInObjectRangeCheck(WorldObject const* obj, WorldObject const* originalCaster, float range)
+                : i_obj(obj), i_originalCaster(originalCaster), i_range(range)
             {
-                Unit const* check = i_funit;
-                Unit const* owner = i_funit->GetOwner();
-                if(owner)
-                    check = owner;
-                i_targetForPlayer = ( check->GetTypeId()==TYPEID_PLAYER );
+                i_targetForUnit = i_originalCaster->isType(TYPEMASK_UNIT);
+                i_targetForPlayer = (i_originalCaster->GetTypeId() == TYPEID_PLAYER);
             }
             bool operator()(Unit* u)
             {
                 // Check contains checks for: live, non-selectable, non-attackable flags, flight check and GM check, ignore totems
                 if (!u->isTargetableForAttack())
                     return false;
+
+                // ignore totems as AoE targets
                 if(u->GetTypeId()==TYPEID_UNIT && ((Creature*)u)->isTotem())
                     return false;
-                if (!u->isVisibleForOrDetect(i_funit, i_funit, false))
+
+                // check visibility only for unit-like original casters
+                if (i_targetForUnit && !u->isVisibleForOrDetect((Unit const*)i_originalCaster, i_originalCaster, false))
                     return false;
 
-                if(( i_targetForPlayer ? !i_funit->IsFriendlyTo(u) : i_funit->IsHostileTo(u) )&& i_obj->IsWithinDistInMap(u, i_range))
+                if ((i_targetForPlayer ? !i_originalCaster->IsFriendlyTo(u) : i_originalCaster->IsHostileTo(u)) && i_obj->IsWithinDistInMap(u, i_range))
                     return true;
 
                 return false;
             }
         private:
+            bool i_targetForUnit;
             bool i_targetForPlayer;
             WorldObject const* i_obj;
-            Unit const* i_funit;
+            WorldObject const* i_originalCaster;
             float i_range;
     };
 

src/game/Spell.cpp

@@ -1660,7 +1660,7 @@ void Spell::SetTargetMap(SpellEffectIndex effIndex, uint32 targetMode, UnitList&
             else
             {
                 Unit* pUnitTarget = m_targets.getUnitTarget();
-                Unit* originalCaster = GetAffectiveCaster();
+                WorldObject* originalCaster = GetAffectiveCasterObject();
                 if(!pUnitTarget || !originalCaster)
                     break;
 
@@ -6486,6 +6486,16 @@ void Spell::FillRaidOrPartyHealthPriorityTargets(UnitList &targetUnitMap, Unit*
     }
 }
 
+WorldObject* Spell::GetAffectiveCasterObject() const
+{
+    if (m_originalCasterGUID.IsEmpty())
+        return m_caster;
+
+    if (m_originalCasterGUID.IsGameobject() && m_caster->IsInWorld())
+        return m_caster->GetMap()->GetGameObject(m_originalCasterGUID);
+    return m_originalCaster;
+}
+
 WorldObject* Spell::GetCastingObject() const
 {
     if (m_originalCasterGUID.IsGameobject())

src/game/Spell.h

@@ -475,7 +475,9 @@ class Spell
         // caster types:
         // formal spell caster, in game source of spell affects cast
         Unit* GetCaster() const { return m_caster; }
-        // real source of cast affects, explcit caster, or DoT/HoT applier, or GO owner, etc. Can be NULL
+        // real source of cast affects, explcit caster, or DoT/HoT applier, or GO owner, or wild GO itself. Can be NULL
+        WorldObject* GetAffectiveCasterObject() const;
+        // limited version returning NULL in cases not Unit* caster object, need for Aura (auras currently not support non-Unit caster)
         Unit* GetAffectiveCaster() const { return !m_originalCasterGUID.IsEmpty() ? m_originalCaster : m_caster; }
         // m_originalCasterGUID can store GO guid, and in this case this is visual caster
         WorldObject* GetCastingObject() const;
@@ -656,7 +658,7 @@ namespace MaNGOS
         SpellNotifierPlayer(Spell &spell, std::list<Unit*> &data, const uint32 &i, float radius)
             : i_data(data), i_spell(spell), i_index(i), i_radius(radius)
         {
-            i_originalCaster = i_spell.GetCastingObject();
+            i_originalCaster = i_spell.GetAffectiveCasterObject();
         }
 
         void Visit(PlayerMapType &m)
@@ -694,7 +696,7 @@ namespace MaNGOS
             SpellTargets TargetType = SPELL_TARGETS_NOT_FRIENDLY)
             : i_data(&data), i_spell(spell), i_push_type(type), i_radius(radius), i_TargetType(TargetType)
         {
-            i_originalCaster = spell.GetCastingObject();
+            i_originalCaster = i_spell.GetAffectiveCasterObject();
             i_playerControled = i_originalCaster  ? i_originalCaster->IsControlledByPlayer() : false;
         }
 

src/shared/revision_nr.h

@@ -1,4 +1,4 @@
 #ifndef __REVISION_NR_H__
 #define __REVISION_NR_H__
- #define REVISION_NR "9849"
+ #define REVISION_NR "9850"
 #endif // __REVISION_NR_H__