Make item size scale with stack size (#17623)

* Make stack count affect item size

* and the test, too

* readd this check

* vwoom

* huh

* if you ever read this commit message ping me on discord in #contributors

* changerinos

Content.Shared/Stacks/StackPrototype.cs

@@ -2,40 +2,46 @@
 using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
 using Robust.Shared.Utility;
 
-namespace Content.Shared.Stacks
+namespace Content.Shared.Stacks;
+
+[Prototype("stack")]
+public sealed class StackPrototype : IPrototype
 {
-    [Prototype("stack")]
-    public sealed class StackPrototype : IPrototype
-    {
-        [ViewVariables]
-        [IdDataField]
-        public string ID { get; } = default!;
+    [ViewVariables]
+    [IdDataField]
+    public string ID { get; } = default!;
 
-        /// <summary>
-        ///     Human-readable name for this stack type e.g. "Steel"
-        /// </summary>
-        /// <remarks>This is a localization string ID.</remarks>
-        [DataField("name")]
-        public string Name { get; } = string.Empty;
+    /// <summary>
+    ///     Human-readable name for this stack type e.g. "Steel"
+    /// </summary>
+    /// <remarks>This is a localization string ID.</remarks>
+    [DataField("name")]
+    public string Name { get; } = string.Empty;
 
-        /// <summary>
-        ///     An icon that will be used to represent this stack type.
-        /// </summary>
-        [DataField("icon")]
-        public SpriteSpecifier? Icon { get; }
+    /// <summary>
+    ///     An icon that will be used to represent this stack type.
+    /// </summary>
+    [DataField("icon")]
+    public SpriteSpecifier? Icon { get; }
 
-        /// <summary>
-        ///     The entity id that will be spawned by default from this stack.
-        /// </summary>
-        [DataField("spawn", required: true, customTypeSerializer:typeof(PrototypeIdSerializer<EntityPrototype>))]
-        public string Spawn { get; } = string.Empty;
+    /// <summary>
+    ///     The entity id that will be spawned by default from this stack.
+    /// </summary>
+    [DataField("spawn", required: true, customTypeSerializer:typeof(PrototypeIdSerializer<EntityPrototype>))]
+    public string Spawn { get; } = string.Empty;
 
-        /// <summary>
-        ///     The maximum amount of things that can be in a stack.
-        ///     Can be overriden on <see cref="StackComponent"/>
-        ///     if null, simply has unlimited max count.
-        /// </summary>
-        [DataField("maxCount")]
-        public int? MaxCount { get; }
-    }
+    /// <summary>
+    ///     The maximum amount of things that can be in a stack.
+    ///     Can be overriden on <see cref="StackComponent"/>
+    ///     if null, simply has unlimited max count.
+    /// </summary>
+    [DataField("maxCount")]
+    public int? MaxCount { get; }
+
+    /// <summary>
+    /// The size of an individual unit of this stack.
+    /// </summary>
+    [DataField("itemSize")]
+    public int? ItemSize;
 }
+