Fix griddrag and tethergun (#10510)

Content.Shared/Maps/SharedGridDraggingSystem.cs

@@ -3,7 +3,7 @@ using Robust.Shared.Serialization;
 namespace Content.Shared.Maps;
 
 /// <summary>
-/// Helper system to allow you to move grids with a mouse.
+/// Helper system to allow you to move entities with a mouse.
 /// </summary>
 public abstract class SharedGridDraggingSystem : EntitySystem
 {
@@ -11,6 +11,15 @@ public abstract class SharedGridDraggingSystem : EntitySystem
 }
 
 
+/// <summary>
+/// Sent from server to client if grid dragging is toggled on.
+/// </summary>
+[Serializable, NetSerializable]
+public sealed class GridDragToggleMessage : EntityEventArgs
+{
+    public bool Enabled;
+}
+
 /// <summary>
 /// Raised on the client to request a grid move to a specific position.
 /// </summary>