[11512] Fixes for channeled spells casting.

* Set as expected caster channeling target to created dynamic object
  at persistent aura area spell casts for channeled spell.
* Select correct caster/target for triggered spell in case channeled perioding trigger aura.

src/game/Spell.cpp

@@ -695,7 +695,7 @@ void Spell::prepareDataForTriggerSystem()
         switch (m_spellInfo->SpellFamilyName)
         {
             case SPELLFAMILY_MAGE:
-                // Arcane Missles / Blizzard triggers need do it
+                // Arcane Missiles / Blizzard triggers need do it
                 if (m_spellInfo->SpellFamilyFlags & UI64LIT(0x0000000000200080))
                     m_canTrigger = true;
                 // Clearcasting trigger need do it
@@ -3166,16 +3166,16 @@ void Spell::cast(bool skipCheck)
 
 void Spell::handle_immediate()
 {
-    // start channeling if applicable
+    // process immediate effects (items, ground, etc.) also initialize some variables
+    _handle_immediate_phase();
+
+    // start channeling if applicable (after _handle_immediate_phase for get persistent effect dynamic object for channel target
     if (IsChanneledSpell(m_spellInfo) && m_duration)
     {
         m_spellState = SPELL_STATE_CASTING;
         SendChannelStart(m_duration);
     }
 
-    // process immediate effects (items, ground, etc.) also initialize some variables
-    _handle_immediate_phase();
-
     for(TargetList::iterator ihit = m_UniqueTargetInfo.begin(); ihit != m_UniqueTargetInfo.end(); ++ihit)
         DoAllEffectOnTarget(&(*ihit));
 
@@ -4010,8 +4010,11 @@ void Spell::SendChannelStart(uint32 duration)
 {
     WorldObject* target = NULL;
 
+    // select dynobject created by first effect if any
+    if (m_spellInfo->Effect[EFFECT_INDEX_0] == SPELL_EFFECT_PERSISTENT_AREA_AURA)
+        target = m_caster->GetDynObject(m_spellInfo->Id, EFFECT_INDEX_0);
     // select first not resisted target from target list for _0_ effect
-    if (!m_UniqueTargetInfo.empty())
+    else if (!m_UniqueTargetInfo.empty())
     {
         for(TargetList::const_iterator itr = m_UniqueTargetInfo.begin(); itr != m_UniqueTargetInfo.end(); ++itr)
         {

src/game/SpellAuras.cpp

@@ -1870,9 +1870,46 @@ void Aura::TriggerSpell()
         }
     }
 
+    Unit* triggerCaster = triggerTarget;
+    WorldObject* triggerTargetObject = NULL;
+
+    // for channeled spell cast applied from aura owner to channel target (persistent aura affects already applied to true target)
+    // come periodic casts applied to targets, so need seelct proper caster (ex. 15790)
+    if (IsChanneledSpell(GetSpellProto()) && GetSpellProto()->Effect[GetEffIndex()] != SPELL_EFFECT_PERSISTENT_AREA_AURA)
+    {
+        // interesting 2 cases: periodic aura at caster of channeled spell
+        if (target->GetObjectGuid() == casterGUID)
+        {
+            triggerCaster = target;
+
+            if (WorldObject* channelTarget = target->GetMap()->GetWorldObject(target->GetChannelObjectGuid()))
+            {
+                if (channelTarget->isType(TYPEMASK_UNIT))
+                    triggerTarget = (Unit*)channelTarget;
+                else
+                    triggerTargetObject = channelTarget;
+            }
+        }
+        // or periodic aura at caster channel target
+        else if (Unit* caster = GetCaster())
+        {
+            if (target->GetObjectGuid() == caster->GetChannelObjectGuid())
+            {
+                triggerCaster = caster;
+                triggerTarget = target;
+            }
+        }
+    }
+
     // All ok cast by default case
     if (triggeredSpellInfo)
-        triggerTarget->CastSpell(triggerTarget, triggeredSpellInfo, true, NULL, this, casterGUID);
+    {
+        if (triggerTargetObject)
+            triggerCaster->CastSpell(triggerTargetObject->GetPositionX(), triggerTargetObject->GetPositionY(), triggerTargetObject->GetPositionZ(),
+                triggeredSpellInfo, true, NULL, this, casterGUID);
+        else
+            triggerCaster->CastSpell(triggerTarget, triggeredSpellInfo, true, NULL, this, casterGUID);
+    }
     else
     {
         if (Unit* caster = GetCaster())

src/shared/revision_nr.h

@@ -1,4 +1,4 @@
 #ifndef __REVISION_NR_H__
 #define __REVISION_NR_H__
- #define REVISION_NR "11511"
+ #define REVISION_NR "11512"
 #endif // __REVISION_NR_H__