Core/Dungeon Finder: Remove disconnected players from LFG queue

Fix LFG queue issues by removing disconnected players from LFG queue and their party with them.

(cherry picked from commit b7f9836d22)

src/server/game/DungeonFinding/LFGMgr.cpp

@@ -583,7 +583,7 @@ void LFGMgr::JoinLfg(Player* player, uint8 roles, LfgDungeonSet& dungeons, const
 
    @param[in]     guid Player or group guid
 */
-void LFGMgr::LeaveLfg(ObjectGuid guid)
+void LFGMgr::LeaveLfg(ObjectGuid guid, bool disconnected)
 {
     ObjectGuid gguid = guid.IsParty() ? guid : GetGroup(guid);
 
@@ -644,7 +644,7 @@ void LFGMgr::LeaveLfg(ObjectGuid guid)
             break;
         case LFG_STATE_DUNGEON:
         case LFG_STATE_FINISHED_DUNGEON:
-            if (guid != gguid) // Player
+            if (guid != gguid && !disconnected) // Player
                 SetState(guid, LFG_STATE_NONE);
             break;
     }

src/server/game/DungeonFinding/LFGMgr.h

@@ -405,7 +405,7 @@ class LFGMgr
         /// Join Lfg with selected roles, dungeons and comment
         void JoinLfg(Player* player, uint8 roles, LfgDungeonSet& dungeons, std::string const& comment);
         /// Leaves lfg
-        void LeaveLfg(ObjectGuid guid);
+        void LeaveLfg(ObjectGuid guid, bool disconnected = false);
 
         // LfgQueue
         /// Get last lfg state (NONE, DUNGEON or FINISHED_DUNGEON)

src/server/game/DungeonFinding/LFGScripts.cpp

@@ -44,6 +44,8 @@ void LFGPlayerScript::OnLogout(Player* player)
         player->GetSession()->SendLfgLfrList(false);
         sLFGMgr->LeaveLfg(player->GetGUID());
     }
+    else if (player->GetSession()->PlayerDisconnected())
+        sLFGMgr->LeaveLfg(player->GetGUID(), true);
 }
 
 void LFGPlayerScript::OnLogin(Player* player, bool /*loginFirst*/)

src/server/game/Server/WorldSession.h

@@ -807,6 +807,7 @@ class WorldSession
         bool PlayerLogout() const { return m_playerLogout; }
         bool PlayerLogoutWithSave() const { return m_playerLogout && m_playerSave; }
         bool PlayerRecentlyLoggedOut() const { return m_playerRecentlyLogout; }
+        bool PlayerDisconnected() const { return !m_Socket; }
 
         void ReadAddonsInfo(ByteBuffer& data);
         void SendAddonsInfo();