Apply autostack FiR rules to Top Up action

Patches/StackFirItemsPatch.cs

@@ -8,7 +8,15 @@ using System.Reflection;
 
 namespace UIFixes
 {
-    public class StackFirItemsPatch : ModulePatch
+    public static class StackFirItemsPatches
+    {
+        public static void Enable()
+        {
+            new ContainerStackPatch().Enable();
+            new TopUpStackPatch().Enable();
+        }
+
+        public class ContainerStackPatch : ModulePatch
         {
             private static Type MergeableItemType;
 
@@ -59,4 +67,34 @@ namespace UIFixes
                 return false;
             }
         }
+
+        public class TopUpStackPatch : ModulePatch
+        {
+            protected override MethodBase GetTargetMethod()
+            {
+                return AccessTools.Method(typeof(Item), nameof(Item.IsSameItem));
+            }
+
+            [PatchPrefix]
+            public static bool Prefix(Item __instance, Item other, ref bool __result)
+            {
+                bool ignoreSpawnedInSession;
+                if (__instance.Template is MoneyClass)
+                {
+                    ignoreSpawnedInSession = Settings.MergeFIRMoney.Value;
+                }
+                else if (__instance.Template is AmmoTemplate)
+                {
+                    ignoreSpawnedInSession = Settings.MergeFIRAmmo.Value;
+                }
+                else
+                {
+                    ignoreSpawnedInSession = Settings.MergeFIROther.Value;
+                }
+
+                __result = __instance.TemplateId == other.TemplateId && __instance.Id != other.Id && (ignoreSpawnedInSession || __instance.SpawnedInSession == other.SpawnedInSession);
+                return false;
+            }
+        }
+    }
 }

Plugin.cs

@@ -24,7 +24,7 @@ namespace UIFixes
             InspectWindowStatsPatches.Enable();
             new RemoveDoorActionsPatch().Enable();
             ScrollPatches.Enable();
-            new StackFirItemsPatch().Enable();
+            StackFirItemsPatches.Enable();
             SwapPatches.Enable();
             SyncScrollPositionPatches.Enable();
             new TransferConfirmPatch().Enable();