NodeGroups are dirtied when one of the nodes' snapgrid position changes.

Adds method to add behavior to a node when its snapgrid position changes.

Content.Server/GameObjects/Components/NodeContainer/NodeGroups/BaseNetConnectorNodeGroup.cs

@@ -16,7 +16,7 @@ namespace Content.Server.GameObjects.Components.NodeContainer.NodeGroups
                 .GetAllComponents<TNetConnector>()
                 .Where(powerComp => (NodeGroupID) powerComp.Voltage == node.NodeGroupID)
                 .ToList();
-            _netConnectorComponents.Add(node, newNetConnectorComponents);
+            _netConnectorComponents[node] = newNetConnectorComponents;
             foreach (var netConnectorComponent in newNetConnectorComponents)
             {
                 SetNetConnectorNet(netConnectorComponent);

Content.Server/GameObjects/Components/NodeContainer/Nodes/Node.cs

@@ -73,6 +73,10 @@ namespace Content.Server.GameObjects.Components.NodeContainer.Nodes
             }
         }
 
+        public virtual void OnSnapGridMove()
+        {
+        }
+
         public virtual void OnContainerShutdown()
         {
             _deleting = true;

Content.Server/GameObjects/EntitySystems/NodeGroupSystem.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using Content.Server.GameObjects.Components.NodeContainer;
 using Content.Server.GameObjects.Components.NodeContainer.NodeGroups;
 using JetBrains.Annotations;
 using Robust.Shared.GameObjects;
@@ -10,6 +11,22 @@ namespace Content.Server.GameObjects.EntitySystems
     {
         private readonly HashSet<INodeGroup> _dirtyNodeGroups = new();
 
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            SubscribeLocalEvent<NodeContainerComponent, SnapGridPositionChangedEvent>(OnSnapGridPositionChanged);
+        }
+
+        private void OnSnapGridPositionChanged(EntityUid uid, NodeContainerComponent component, SnapGridPositionChangedEvent args)
+        {
+            foreach (var node in component.Nodes.Values)
+            {
+                node.OnSnapGridMove();
+                AddDirtyNodeGroup(node.NodeGroup);
+            }
+        }
+
         public void AddDirtyNodeGroup(INodeGroup nodeGroup)
         {
             _dirtyNodeGroups.Add(nodeGroup);