Fix mouse rotator error spam (#39071)

Ignore mouse rotation requests when the player is switching controlled entity

Content.Client/MouseRotator/MouseRotatorSystem.cs

@@ -57,7 +57,8 @@ public sealed class MouseRotatorSystem : SharedMouseRotatorSystem
                 rotation += 2 * Math.PI;
             RaisePredictiveEvent(new RequestMouseRotatorRotationEvent
             {
-                Rotation = rotation
+                Rotation = rotation,
+                User = GetNetEntity(player)
             });
 
             return;
@@ -77,7 +78,8 @@ public sealed class MouseRotatorSystem : SharedMouseRotatorSystem
 
         RaisePredictiveEvent(new RequestMouseRotatorRotationEvent
         {
-            Rotation = angle
+            Rotation = angle,
+            User = GetNetEntity(player)
         });
     }
 }

Content.Shared/MouseRotator/MouseRotatorComponent.cs

@@ -48,4 +48,5 @@ public sealed partial class MouseRotatorComponent : Component
 public sealed class RequestMouseRotatorRotationEvent : EntityEventArgs
 {
     public Angle Rotation;
+    public NetEntity? User;
 }

Content.Shared/MouseRotator/SharedMouseRotatorSystem.cs

@@ -47,6 +47,11 @@ public abstract class SharedMouseRotatorSystem : EntitySystem
 
     private void OnRequestRotation(RequestMouseRotatorRotationEvent msg, EntitySessionEventArgs args)
     {
+        // Ignore the request if the requested entity is not the user's attached entity.
+        // This can happen when a player switches controlled entities while rotating.
+        if (args.SenderSession.AttachedEntity != GetEntity(msg.User))
+            return;
+
         if (args.SenderSession.AttachedEntity is not { } ent
             || !TryComp<MouseRotatorComponent>(ent, out var rotator))
         {