fix lathe queue interruption bug (#10533)

Content.Server/Lathe/LatheSystem.cs

@@ -15,6 +15,7 @@ using Robust.Shared.Prototypes;
 using Robust.Shared.Player;
 using JetBrains.Annotations;
 using System.Linq;
+using Content.Server.Power.Components;
 using Robust.Server.Player;
 
 namespace Content.Server.Lathe
@@ -27,7 +28,7 @@ namespace Content.Server.Lathe
         [Dependency] private readonly SharedAudioSystem _audioSys = default!;
         [Dependency] private readonly UserInterfaceSystem _uiSys = default!;
         [Dependency] private readonly ResearchSystem _researchSys = default!;
-        
+
         public override void Initialize()
         {
             base.Initialize();
@@ -36,6 +37,7 @@ namespace Content.Server.Lathe
             SubscribeLocalEvent<LatheComponent, LatheQueueRecipeMessage>(OnLatheQueueRecipeMessage);
             SubscribeLocalEvent<LatheComponent, LatheSyncRequestMessage>(OnLatheSyncRequestMessage);
             SubscribeLocalEvent<LatheComponent, LatheServerSelectionMessage>(OnLatheServerSelectionMessage);
+            SubscribeLocalEvent<LatheComponent, PowerChangedEvent>(OnPowerChanged);
             SubscribeLocalEvent<TechnologyDatabaseComponent, LatheServerSyncMessage>(OnLatheServerSyncMessage);
         }
 
@@ -156,7 +158,7 @@ namespace Content.Server.Lathe
             EntityManager.QueueDeleteEntity(args.Used);
 
             EnsureComp<LatheInsertingComponent>(uid).TimeRemaining = component.InsertionTime;
-            
+
             _popupSystem.PopupEntity(Loc.GetString("machine-insert-item", ("machine", uid),
                 ("item", args.Used)), uid, Filter.Entities(args.User));
 
@@ -167,6 +169,14 @@ namespace Content.Server.Lathe
             UpdateInsertingAppearance(uid, true);
         }
 
+
+        private void OnPowerChanged(EntityUid uid, LatheComponent component, PowerChangedEvent args)
+        {
+            //if the power state changes, try to produce.
+            //aka, if you went from unpowered --> powered, resume lathe queue.
+            TryStartProducing(uid, component: component);
+        }
+
         /// <summary>
         /// This handles the checks to start producing an item, and
         /// starts up the sound and visuals