Fix Vigilance.

Implements Glyph of Vigilance.
Fixes issue #1134. Thanks Bodompelle for the idea, even thought the fix is rather different.

--HG--
branch : trunk

src/game/SpellAuras.cpp

@@ -1320,6 +1320,17 @@ void Aura::HandleAuraSpecificMods(AuraApplication const * aurApp, Unit * caster,
     // mods at aura apply or remove
     switch (GetSpellProto()->SpellFamilyName)
     {
+        case SPELLFAMILY_GENERIC:
+            switch(GetId())
+            {
+                case 50720: // Vigilance
+                    if (apply)
+                        target->CastSpell(caster, 59665, true, 0, 0, caster->GetGUID());
+                    else
+                        target->SetReducedThreatPercent(0,0);
+                    break;
+            }
+            break;
         case SPELLFAMILY_ROGUE:
             // Stealth
             if (GetSpellProto()->SpellFamilyFlags[0] & 0x00400000)

src/game/ThreatManager.cpp

@@ -384,9 +384,16 @@ void ThreatManager::addThreat(Unit* pVictim, float fThreat, SpellSchoolMask scho
     // must check > 0.0f, otherwise dead loop
     if (threat > 0.0f && pVictim->GetReducedThreatPercent())
     {
-        float reducedThreat = threat * pVictim->GetReducedThreatPercent() / 100;
+        uint32 reducedThreadPercent = pVictim->GetReducedThreatPercent();
+
+        Unit *unit = pVictim->GetMisdirectionTarget();
+        if (unit)
+            if (Aura* pAura = unit->GetAura(63326)) // Glyph of Vigilance
+                reducedThreadPercent += pAura->GetSpellProto()->EffectBasePoints[0];
+
+        float reducedThreat = threat * reducedThreadPercent / 100;
         threat -= reducedThreat;
-        if (Unit *unit = pVictim->GetMisdirectionTarget())
+        if (unit)
             _addThreat(unit, reducedThreat);
     }