Core/Spell: fix some issues with taunt spells

src/server/game/Spells/Spell.cpp

@@ -2439,6 +2439,10 @@ void Spell::TargetInfo::PreprocessTarget(Spell* spell)
     else if (MissCondition == SPELL_MISS_REFLECT && ReflectResult == SPELL_MISS_NONE)
         _spellHitTarget = spell->m_caster->ToUnit();
 
+    // Ensure that a player target is put in combat by a taunt, even if they result immune clientside
+    if ((MissCondition == SPELL_MISS_IMMUNE || MissCondition == SPELL_MISS_IMMUNE2) && spell->m_caster->GetTypeId() == TYPEID_PLAYER && unit->GetTypeId() == TYPEID_PLAYER && spell->m_caster->IsValidAttackTarget(unit, spell->GetSpellInfo()))
+        unit->SetInCombatWith(spell->m_caster->ToPlayer());
+
     _enablePVP = false; // need to check PvP state before spell effects, but act on it afterwards
     if (_spellHitTarget)
     {