fix(Core/LFG): Sort players by role in LFG proposals (#25954)

src/server/game/DungeonFinding/LFGMgr.cpp

@@ -1692,18 +1692,32 @@ namespace lfg
         LfgGuidList players;
         GuidUnorderedSet playersToTeleport;
 
-        for (LfgProposalPlayerContainer::const_iterator it = proposal.players.begin(); it != proposal.players.end(); ++it)
-        {
-            ObjectGuid guid = it->first;
-            if (guid == proposal.leader)
-                players.push_front(guid);
-            else
-                players.push_back(guid);
+        // Sort players by role, leader first, then tank, healer and dps
+        std::vector<ObjectGuid> tanks, healers, dps;
 
+        if (proposal.leader && proposal.players.contains(proposal.leader))
+            players.push_back(proposal.leader);
+
+        for (auto const& [guid, player] : proposal.players)
+        {
             if (proposal.isNew || GetGroup(guid) != proposal.group)
                 playersToTeleport.insert(guid);
+
+            if (guid == proposal.leader)
+                continue;
+
+            if (player.role & lfg::PLAYER_ROLE_TANK)
+                tanks.push_back(guid);
+            else if (player.role & lfg::PLAYER_ROLE_HEALER)
+                healers.push_back(guid);
+            else
+                dps.push_back(guid);
         }
 
+        players.insert(players.end(), tanks.begin(), tanks.end());
+        players.insert(players.end(), healers.begin(), healers.end());
+        players.insert(players.end(), dps.begin(), dps.end());
+
         // Set the dungeon difficulty
         LFGDungeonData const* dungeon = GetLFGDungeon(proposal.dungeonId);
         ASSERT(dungeon);

src/server/game/Handlers/LFGHandler.cpp

@@ -569,12 +569,32 @@ void WorldSession::SendLfgUpdateProposal(lfg::LfgProposal const& proposal)
     data << uint8(silent);                                 // Show proposal window
     data << uint8(proposal.players.size());                // Group size
 
-    for (lfg::LfgProposalPlayerContainer::const_iterator it = proposal.players.begin(); it != proposal.players.end(); ++it)
+    // Sort by roles: tank, healer, dps
+    std::vector<ObjectGuid> ordered;
+    ordered.reserve(proposal.players.size());
+
+    std::vector<ObjectGuid> tanks, healers, dps;
+
+    for (auto const& [pguid, player] : proposal.players)
     {
-        lfg::LfgProposalPlayer const& player = it->second;
+        if (player.role & lfg::PLAYER_ROLE_TANK)
+            tanks.push_back(pguid);
+        else if (player.role & lfg::PLAYER_ROLE_HEALER)
+            healers.push_back(pguid);
+        else
+            dps.push_back(pguid);
+    }
+
+    ordered.insert(ordered.end(), tanks.begin(), tanks.end());
+    ordered.insert(ordered.end(), healers.begin(), healers.end());
+    ordered.insert(ordered.end(), dps.begin(), dps.end());
+
+    for (auto const& pguid : ordered)
+    {
+        lfg::LfgProposalPlayer const& player = proposal.players.find(pguid)->second;
         data << uint32(player.role);                       // Role
-        data << uint8(it->first == guid);                  // Self player
-        if (!player.group)                                 // Player not it a group
+        data << uint8(pguid == guid);                      // Self player
+        if (!player.group)                                 // Player not in a group
         {
             data << uint8(0);                              // Not in dungeon
             data << uint8(0);                              // Not same group