Add ability to show stack visuals on closed containers

Content.Client/Storage/Systems/ItemCounterSystem.cs

@@ -31,7 +31,7 @@ private void OnAppearanceChange(EntityUid uid, ItemCounterComponent comp, ref Ap
 
         if (!_appearanceSystem.TryGetData<bool>(uid, StackVisuals.Hide, out var hidden, args.Component))
             hidden = false;
-        
+
         if (comp.IsComposite)
             ProcessCompositeSprite(uid, actual, maxCount, comp.LayerStates, hidden, sprite: args.Sprite);
         else

Content.Shared/Storage/Components/ItemCounterComponent.cs

@@ -1,4 +1,4 @@
-using Content.Shared.Storage.EntitySystems;
+using Content.Shared.Storage.EntitySystems;
 using Content.Shared.Whitelist;
 
 namespace Content.Shared.Storage.Components

Content.Shared/Storage/EntitySystems/SharedStorageSystem.cs

@@ -806,7 +806,11 @@ public void UpdateAppearance(Entity<StorageComponent?, AppearanceComponent?> ent
         _appearance.SetData(uid, StorageVisuals.Capacity, capacity, appearance);
         _appearance.SetData(uid, StorageVisuals.Open, isOpen, appearance);
         _appearance.SetData(uid, SharedBagOpenVisuals.BagState, isOpen ? SharedBagState.Open : SharedBagState.Closed, appearance);
-        _appearance.SetData(uid, StackVisuals.Hide, !isOpen, appearance);
+
+        // set the StackVisuals.Hide property to true when the container is closed. This is done
+        // on containers that only show their contents when they are open (e.g. donut boxes)
+        if (storage.HideClosedStackVisuals)
+            _appearance.SetData(uid, StackVisuals.Hide, !isOpen, appearance);
     }
 
     /// <summary>

Content.Shared/Storage/StorageComponent.cs

@@ -123,6 +123,14 @@ public sealed partial class StorageComponent : Component
         [DataField, ViewVariables(VVAccess.ReadWrite)]
         public StorageDefaultOrientation? DefaultStorageOrientation;
 
+        /// <summary>
+        /// If true, sets StackVisuals.Hide to true when the container is closed
+        /// Used in cases where there are sprites that are shown when the container is open but not
+        /// when it is closed
+        /// </summary>
+        [DataField]
+        public bool HideClosedStackVisuals = true;
+
         [Serializable, NetSerializable]
         public enum StorageUiKey : byte
         {

Resources/Prototypes/Entities/Objects/Consumable/Drinks/drinks_cans.yml

@@ -432,6 +432,7 @@
     whitelist:
       tags:
         - Cola
+    hideClosedStackVisuals: false
   - type: StorageFill
     contents:
       - id: DrinkColaCan