Name unknown field in who list packet.

Thanks to Grender.

src/game/Handlers/MiscHandler.cpp

@@ -215,7 +215,7 @@ public:
             data << uint32(pzoneid);                            // player zone id
 
 #if SUPPORTED_CLIENT_BUILD <= CLIENT_BUILD_1_8_4
-            data << uint32(0);                                  // unknown
+            data << uint32(pPlayer->GetWhoListPartyStatus());   // not actually displayed anywhere
 #endif
             // 50 is maximum player count sent to client
             if ((++clientcount) == 49)

src/game/Objects/Player.cpp

@@ -2881,6 +2881,19 @@ void Player::RemoveFromGroup(Group* group, ObjectGuid guid)
     }
 }
 
+#if SUPPORTED_CLIENT_BUILD <= CLIENT_BUILD_1_8_4
+uint32 Player::GetWhoListPartyStatus() const
+{
+    if (sLFGMgr.IsPlayerInQueue(GetObjectGuid()))
+        return WHO_PARTY_STATUS_LFG;
+
+    if (GetGroup())
+        return WHO_PARTY_STATUS_IN_PARTY;
+
+    return WHO_PARTY_STATUS_NOT_IN_PARTY;
+}
+#endif
+
 void Player::SendLogXPGain(uint32 GivenXP, Unit* victim, uint32 RestXP) const
 {
     WorldPacket data(SMSG_LOG_XPGAIN, 21);

src/game/Objects/Player.h

@@ -344,6 +344,15 @@ enum PlayerFieldByte2Flags
     PLAYER_FIELD_BYTE2_INVISIBILITY_GLOW = 0x40
 };
 
+#if SUPPORTED_CLIENT_BUILD <= CLIENT_BUILD_1_8_4
+enum WhoListPartyStatus
+{
+    WHO_PARTY_STATUS_NOT_IN_PARTY = 0x0,
+    WHO_PARTY_STATUS_IN_PARTY     = 0x1,
+    WHO_PARTY_STATUS_LFG          = 0x2
+};
+#endif
+
 enum ActivateTaxiReplies
 {
     ERR_TAXIOK                      = 0,
@@ -2455,6 +2464,10 @@ class MANGOS_DLL_SPEC Player final: public Unit
         void SendUpdateToOutOfRangeGroupMembers();
         void SendDestroyGroupMembers(bool includingSelf = false);
 
+#if SUPPORTED_CLIENT_BUILD <= CLIENT_BUILD_1_8_4
+        uint32 GetWhoListPartyStatus() const;
+#endif
+
         // BattleGround Group System
         void SetBattleGroundRaid(Group* group, int8 subgroup = -1);
         void RemoveFromBattleGroundRaid();