No pulling yourself via your chair (#5324)

Content.Shared/Pulling/Systems/SharedPullingSystem.Actions.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using Content.Shared.Alert;
+using Content.Shared.Buckle.Components;
 using Content.Shared.GameTicking;
 using Content.Shared.Input;
 using Content.Shared.Physics.Pull;
@@ -49,6 +50,15 @@ namespace Content.Shared.Pulling
                 return false;
             }
 
+            if (puller.TryGetComponent<SharedBuckleComponent>(out var buckle))
+            {
+                // Prevent people pulling the chair they're on, etc.
+                if (buckle.Buckled && (buckle.LastEntityBuckledTo == pulled.Uid))
+                {
+                    return false;
+                }
+            }
+
             var startPull = new StartPullAttemptEvent(puller, pulled);
             RaiseLocalEvent(puller.Uid, startPull);
             return !startPull.Cancelled;