Nullspace map entity is created every time the client joins the server. This fixes #520.

Content.Client/EntryPoint.cs

@@ -173,6 +173,11 @@ namespace Content.Client
             {
                 _stateManager.RequestStateChange<GameScreen>();
             };
+
+            _baseClient.PlayerJoinedServer += (sender, args) =>
+            {
+                IoCManager.Resolve<IMapManager>().CreateNewMapEntity(MapId.Nullspace);
+            };
         }
 
         /// <summary>
@@ -217,7 +222,6 @@ namespace Content.Client
             IoCManager.Resolve<IChatManager>().Initialize();
             IoCManager.Resolve<ISandboxManager>().Initialize();
             IoCManager.Resolve<IClientPreferencesManager>().Initialize();
-            IoCManager.Resolve<IMapManager>().CreateNewMapEntity(MapId.Nullspace);
             IoCManager.Resolve<IItemSlotManager>().Initialize();
         }
 

Content.Client/Parallax/ParallaxOverlay.cs

@@ -1,4 +1,4 @@
-using Content.Client.Interfaces.Parallax;
+using Content.Client.Interfaces.Parallax;
 using Robust.Client.Graphics;
 using Robust.Client.Graphics.Drawing;
 using Robust.Client.Graphics.Overlays;
@@ -52,7 +52,7 @@ namespace Content.Client.Parallax
             var screenHandle = (DrawingHandleScreen) handle;
 
             var (sizeX, sizeY) = _parallaxTexture.Size;
-            var (posX, posY) = _eyeManager.ScreenToWorld(Vector2.Zero).ToWorld(_mapManager).Position;
+            var (posX, posY) = _eyeManager.ScreenToMap(Vector2.Zero).Position;
             var (ox, oy) = (Vector2i) new Vector2(-posX / Slowness, posY / Slowness);
             ox = MathHelper.Mod(ox, sizeX);
             oy = MathHelper.Mod(oy, sizeY);

Content.Server/GameTicking/GameTicker.cs

@@ -322,11 +322,7 @@ namespace Content.Server.GameTicking
                 // FIXME: Actually, definitely.
                 entity.Delete();
 
-            // Delete all maps outside of nullspace.
-            foreach (var mapId in _mapManager.GetAllMapIds().ToList())
-                // TODO: Maybe something less naive here?
-                if (mapId != MapId.Nullspace)
-                    _mapManager.DeleteMap(mapId);
+            _mapManager.Restart();
 
             // Delete the minds of everybody.
             // TODO: Maybe move this into a separate manager?