Core/Loot: make Loot::AddItem() honor LootItem::AllowedForPlayer() so that items that cannot be looted don't prevent skinning. (#23408)

(cherry picked from commit a1b2aa97fc)

src/server/game/Loot/Loot.cpp

@@ -248,6 +248,8 @@ bool Loot::FillLoot(uint32 lootId, LootStore const& store, Player* lootOwner, bo
     if (!lootOwner)
         return false;
 
+    lootOwnerGUID = lootOwner->GetGUID();
+
     LootTemplate const* tab = store.GetLootFor(lootId);
 
     if (!tab)
@@ -316,6 +318,24 @@ void Loot::AddItem(LootStoreItem const& item)
         lootItems.push_back(generatedLoot);
         count -= proto->GetMaxStackSize();
 
+        // In some cases, a dropped item should be visible/lootable only for some players in group
+        bool canSeeItemInLootWindow = false;
+        if (Player* player = ObjectAccessor::FindPlayer(lootOwnerGUID))
+        {
+            if (Group* group = player->GetGroup())
+            {
+                for (GroupReference* itr = group->GetFirstMember(); itr != nullptr; itr = itr->next())
+                    if (Player* member = itr->GetSource())
+                        if (generatedLoot.AllowedForPlayer(member))
+                            canSeeItemInLootWindow = true;
+            }
+            else if (generatedLoot.AllowedForPlayer(player))
+                canSeeItemInLootWindow = true;
+        }
+
+        if (!canSeeItemInLootWindow)
+            continue;
+
         // non-conditional one-player only items are counted here,
         // free for all items are counted in FillFFALoot(),
         // non-ffa conditionals are counted in FillNonQuestNonFFAConditionalLoot()

src/server/game/Loot/Loot.h

@@ -215,6 +215,7 @@ struct TC_GAME_API Loot
     uint32 gold;
     uint8 unlootedCount;
     ObjectGuid roundRobinPlayer;                            // GUID of the player having the Round-Robin ownership for the loot. If 0, round robin owner has released.
+    ObjectGuid lootOwnerGUID;
     LootType loot_type;                                     // required for achievement system
     uint8 maxDuplicates;                                    // Max amount of items with the same entry that can drop (default is 1; on 25 man raid mode 3)