Maps/Instances: Implement handling of CMSG_SET_SAVED_INSTANCE_EXTEND

src/server/game/Maps/Map.cpp

@@ -3209,22 +3209,37 @@ bool InstanceMap::Reset(uint8 method)
         }
         else
         {
+            bool doUnload = true;
             if (method == INSTANCE_RESET_GLOBAL)
+            {
                 // set the homebind timer for players inside (1 minute)
                 for (MapRefManager::iterator itr = m_mapRefManager.begin(); itr != m_mapRefManager.end(); ++itr)
-                    itr->GetSource()->m_InstanceValid = false;
+                {
+                    InstancePlayerBind* bind = itr->GetSource()->GetBoundInstance(GetId(), GetDifficulty());
+                    if (bind && bind->extendState && bind->save->GetInstanceId() == GetInstanceId())
+                        doUnload = false;
+                    else
+                        itr->GetSource()->m_InstanceValid = false;
+                }
 
-            // the unload timer is not started
-            // instead the map will unload immediately after the players have left
-            m_unloadWhenEmpty = true;
-            m_resetAfterUnload = true;
+                if (doUnload && HasPermBoundPlayers()) // check if any unloaded players have a nonexpired save to this
+                    doUnload = false;
+            }
+
+            if (doUnload)
+            {
+                // the unload timer is not started
+                // instead the map will unload immediately after the players have left
+                m_unloadWhenEmpty = true;
+                m_resetAfterUnload = true;
+            }
         }
     }
     else
     {
         // unloaded at next update
         m_unloadTimer = MIN_UNLOAD_DELAY;
-        m_resetAfterUnload = true;
+        m_resetAfterUnload = !(method == INSTANCE_RESET_GLOBAL && HasPermBoundPlayers());
     }
 
     return m_mapRefManager.isEmpty();
@@ -3305,6 +3320,13 @@ MapDifficulty const* Map::GetMapDifficulty() const
     return GetMapDifficultyData(GetId(), GetDifficulty());
 }
 
+bool InstanceMap::HasPermBoundPlayers() const
+{
+    PreparedStatement* stmt = CharacterDatabase.GetPreparedStatement(CHAR_SEL_PERM_BIND_BY_INSTANCE);
+    stmt->setUInt16(0,GetInstanceId());
+    return !!CharacterDatabase.Query(stmt);
+}
+
 uint32 InstanceMap::GetMaxPlayers() const
 {
     MapDifficulty const* mapDiff = GetMapDifficulty();