fix(Core/Spells): Send proper caster's guid in SMSG_SPELL_START/SMSG_SPELL_GO packets in case of spells casted originally by gameobjects. (#11337)

Added visual channeling when mind controlling Razorgore by player.
Fixes #11275

src/server/game/Spells/Spell.cpp

@@ -4495,13 +4495,25 @@ void Spell::SendSpellStart()
     if (m_spellInfo->RuneCostID && m_spellInfo->PowerType == POWER_RUNE)
         castFlags |= CAST_FLAG_NO_GCD; // not needed, but Blizzard sends it
 
+    PackedGuid realCasterGUID = m_caster->GetPackGUID();
+    if (TempSummon const* tempSummon = m_caster->ToTempSummon())
+    {
+        if (tempSummon->GetEntry() == WORLD_TRIGGER)
+        {
+            if (GameObject* casterGameobject = tempSummon->GetSummonerGameObject())
+            {
+                realCasterGUID = casterGameobject->GetPackGUID();
+            }
+        }
+    }
+
     WorldPacket data(SMSG_SPELL_START, (8 + 8 + 4 + 4 + 2));
     if (m_CastItem)
         data << m_CastItem->GetPackGUID();
     else
-        data << m_caster->GetPackGUID();
+        data << realCasterGUID;
 
-    data << m_caster->GetPackGUID();
+    data << realCasterGUID;
     data << uint8(m_cast_count);                            // pending spell cast?
     data << uint32(m_spellInfo->Id);                        // spellId
     data << uint32(castFlags);                              // cast flags
@@ -4581,14 +4593,26 @@ void Spell::SendSpellGo()
     if (!m_spellInfo->StartRecoveryTime)
         castFlags |= CAST_FLAG_NO_GCD;
 
+    PackedGuid realCasterGUID = m_caster->GetPackGUID();
+    if (TempSummon const* tempSummon = m_caster->ToTempSummon())
+    {
+        if (tempSummon->GetEntry() == WORLD_TRIGGER)
+        {
+            if (GameObject* casterGameobject = tempSummon->GetSummonerGameObject())
+            {
+                realCasterGUID = casterGameobject->GetPackGUID();
+            }
+        }
+    }
+
     WorldPacket data(SMSG_SPELL_GO, 150);                    // guess size
 
     if (m_CastItem)
         data << m_CastItem->GetPackGUID();
     else
-        data << m_caster->GetPackGUID();
+        data << realCasterGUID;
 
-    data << m_caster->GetPackGUID();
+    data << realCasterGUID;
     data << uint8(m_cast_count);                            // pending spell cast?
     data << uint32(m_spellInfo->Id);                        // spellId
     data << uint32(castFlags);                              // cast flags

src/server/scripts/EasternKingdoms/BlackrockMountain/BlackwingLair/boss_razorgore.cpp

@@ -34,6 +34,7 @@ enum Say
 enum Spells
 {
     SPELL_MINDCONTROL           = 19832,
+    SPELL_MINDCONTROL_VISUAL    = 45537,
     SPELL_EGG_DESTROY           = 19873,
     SPELL_MIND_EXHAUSTION       = 23958,
 
@@ -161,12 +162,14 @@ public:
                 if (Unit* charmer = ObjectAccessor::GetUnit(*me, _charmerGUID))
                 {
                     charmer->CastSpell(charmer, SPELL_MIND_EXHAUSTION, true);
+                    charmer->CastSpell(me, SPELL_MINDCONTROL_VISUAL, false);
                 }
             }
             else
             {
                 if (Unit* charmer = ObjectAccessor::GetUnit(*me, _charmerGUID))
                 {
+                    charmer->RemoveAurasDueToSpell(SPELL_MINDCONTROL_VISUAL);
                     me->TauntApply(charmer);
                 }
             }