fix(Core/Scripting): Fix healing reduction abilities not applying cor… (#10435)

src/server/game/Entities/Unit/Unit.cpp

@@ -11979,8 +11979,8 @@ uint32 Unit::SpellHealingBonusTaken(Unit* caster, SpellInfo const* spellProto, u
 {
     float TakenTotalMod = 1.0f;
     float minval = 0.0f;
-    // Healing taken percent
 
+    // Healing taken percent
     if (!sScriptMgr->OnSpellHealingBonusTakenNegativeModifiers(this, caster, spellProto, minval))
     {
         minval = float(GetMaxNegativeAuraModifier(SPELL_AURA_MOD_HEALING_PCT));

src/server/game/Scripting/ScriptDefines/GlobalScript.cpp

@@ -143,13 +143,13 @@ bool ScriptMgr::OnSpellHealingBonusTakenNegativeModifiers(Unit const* target, Un
 {
     auto ret = IsValidBoolScript<GlobalScript>([&](GlobalScript* script)
     {
-        return !script->OnSpellHealingBonusTakenNegativeModifiers(target, caster, spellInfo, val);
+        return script->OnSpellHealingBonusTakenNegativeModifiers(target, caster, spellInfo, val);
     });
 
     if (ret && *ret)
     {
-        return false;
+        return true;
     }
 
-    return true;
+    return false;
 }

src/server/game/Scripting/ScriptMgr.h

@@ -1530,7 +1530,7 @@ public:
     virtual bool OnIsAffectedBySpellModCheck(SpellInfo const* /*affectSpell*/, SpellInfo const* /*checkSpell*/, SpellModifier const* /*mod*/) { return true; };
 
     // Called when checking for spell negative healing modifiers
-    virtual bool OnSpellHealingBonusTakenNegativeModifiers(Unit const* /*target*/, Unit const* /*caster*/, SpellInfo const* /*spellInfo*/, float& /*val*/) { return true; };
+    virtual bool OnSpellHealingBonusTakenNegativeModifiers(Unit const* /*target*/, Unit const* /*caster*/, SpellInfo const* /*spellInfo*/, float& /*val*/) { return false; };
 };
 
 class BGScript : public ScriptObject