Core/Quests: Fix an issue where auto-completed quests would not be automatically completed if the quest was added through either the SmartAI action_type SMART_ACTION_ADD_QUEST, the spell effect SPELL_EFFECT_QUEST_START or the opcode CMSG_QUEST_CONFIRM_ACCEPT. Also fixes auto-complete quests in the SAI and opcode case not calling the AI hook.

src/server/game/AI/SmartScripts/SmartScript.cpp

@@ -369,7 +369,7 @@ void SmartScript::ProcessAction(SmartScriptHolder& e, Unit* unit, uint32 var0, u
                 if (IsPlayer(*itr))
                     if (Quest const* q = sObjectMgr->GetQuestTemplate(e.action.quest.quest))
                     {
-                        (*itr)->ToPlayer()->AddQuest(q, NULL);
+                        (*itr)->ToPlayer()->AddQuestAndCheckCompletion(q, NULL);
                         TC_LOG_DEBUG("scripts.ai", "SmartScript::ProcessAction:: SMART_ACTION_ADD_QUEST: Player guidLow %u add quest %u",
                             (*itr)->GetGUIDLow(), e.action.quest.quest);
                     }

src/server/game/Handlers/QuestHandler.cpp

@@ -483,7 +483,7 @@ void WorldSession::HandleQuestConfirmAccept(WorldPacket& recvData)
             return;
 
         if (_player->CanAddQuest(quest, true))
-            _player->AddQuest(quest, NULL);                // NULL, this prevent DB script from duplicate running
+            _player->AddQuestAndCheckCompletion(quest, NULL); // NULL, this prevent DB script from duplicate running
 
         _player->SetDivider(0);
     }

src/server/game/Spells/SpellEffects.cpp

@@ -5595,12 +5595,8 @@ void Spell::EffectQuestStart(SpellEffIndex effIndex)
 
     Player* player = unitTarget->ToPlayer();
     if (Quest const* qInfo = sObjectMgr->GetQuestTemplate(m_spellInfo->Effects[effIndex].MiscValue))
-    {
         if (player->CanTakeQuest(qInfo, false) && player->CanAddQuest(qInfo, false))
-        {
-            player->AddQuest(qInfo, NULL);
-        }
-    }
+            player->AddQuestAndCheckCompletion(qInfo, NULL);
 }
 
 void Spell::EffectActivateRune(SpellEffIndex effIndex)