Core/GameObject: Mage Portals and Refreshment Tables should be usable when the creating Mage is on another map or offline as long as you remain in group (#31730)

Closes #31527

Co-authored-by: CraftedRO <268975402+imstuckbro@users.noreply.github.com>
Co-authored-by: Kaytotes <kaytotes@users.noreply.github.com>
Co-authored-by: Shauren <shauren.trinity@gmail.com>

Author: 3 people

src/server/game/Entities/GameObject/GameObject.cpp

@@ -2034,12 +2034,23 @@ void GameObject::Use(Unit* user)
 
             if (info->spellcaster.partyOnly)
             {
-                Unit* caster = GetOwner();
-                if (!caster || caster->GetTypeId() != TYPEID_PLAYER)
+                ObjectGuid ownerGuid = GetOwnerGUID();
+                if (ownerGuid.IsEmpty())
                     return;
 
-                if (user->GetTypeId() != TYPEID_PLAYER || !user->ToPlayer()->IsInSameRaidWith(caster->ToPlayer()))
-                    return;
+                if (ownerGuid != user->GetGUID())
+                {
+                    if (Unit* owner = ObjectAccessor::GetUnit(*this, ownerGuid))
+                        ownerGuid = owner->GetCharmerOrOwnerOrOwnGUID();
+
+                    Player const* playerUser = user->GetCharmerOrOwnerPlayerOrPlayerItself();
+                    if (!playerUser)
+                        return;
+
+                    Group const* group = playerUser->GetGroup();
+                    if (!group || !group->IsMember(ownerGuid))
+                        return;
+                }
             }
 
             user->RemoveAurasByType(SPELL_AURA_MOUNTED);