Scripts/Spells: Suppression Aura should not hit stealthed units. (#11270)

* Scripts/Spells: Suppression Aura should not hit stealthed units.

Fixes #11249

* Update.

* Update data/sql/updates/pending_db_world/rev_1648996451912542300.sql

Co-authored-by: Nefertumm <nefertum.dev@protonmail.com>

data/sql/updates/pending_db_world/rev_1648996451912542300.sql

@@ -0,0 +1,5 @@
+INSERT INTO `version_db_world` (`sql_rev`) VALUES ('1648996451912542300');
+
+DELETE FROM `spell_script_names` WHERE `spell_id`=22247;
+INSERT INTO `spell_script_names` (`spell_id`, `ScriptName`) VALUES
+(22247,'spell_suppression_aura');

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

@@ -21,6 +21,7 @@
 #include "ScriptMgr.h"
 #include "ScriptedCreature.h"
 #include "blackwing_lair.h"
+#include "SpellScript.h"
 
 enum Say
 {
@@ -247,8 +248,28 @@ class go_suppression_device : public GameObjectScript
         }
 };
 
+class spell_suppression_aura : public SpellScript
+{
+    PrepareSpellScript(spell_suppression_aura);
+
+    void FilterTargets(std::list<WorldObject*>& targets)
+    {
+        targets.remove_if([&](WorldObject* target) -> bool
+        {
+            Unit* unit = target->ToUnit();
+            return !unit || unit->HasAuraType(SPELL_AURA_MOD_STEALTH);
+        });
+    }
+
+    void Register() override
+    {
+        OnObjectAreaTargetSelect += SpellObjectAreaTargetSelectFn(spell_suppression_aura::FilterTargets, EFFECT_ALL, TARGET_UNIT_DEST_AREA_ENEMY);
+    }
+};
+
 void AddSC_boss_broodlord()
 {
     new boss_broodlord();
     new go_suppression_device();
+    RegisterSpellScript(spell_suppression_aura);
 }