Synchronize stash scrolling

Patches/ScrollSyncPatches.cs

@@ -0,0 +1,85 @@
+using Aki.Reflection.Patching;
+using EFT.UI;
+using EFT.UI.Ragfair;
+using HarmonyLib;
+using System.Reflection;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace UIFixes
+{
+    public class ScrollSyncPatches
+    {
+        private static float StashScrollPosition = 1f;
+
+        public static void Enable()
+        {
+            new SimpleStashPanelPatch().Enable();
+            new TraderDealScreenPatch().Enable();
+            new AddOfferWindowPatch().Enable();
+        }
+
+        private static void UpdateScrollPosition(Vector2 position)
+        {
+            StashScrollPosition = position.y;
+        }
+
+        private static void SynchronizeScrollRect(UIElement element, ScrollRect scrollRect = null)
+        {
+            if (!Settings.SynchronizeStashScrolling.Value || element == null || (scrollRect ??= element.GetComponentInChildren<ScrollRect>()) == null)
+            {
+                return;
+            }
+
+            scrollRect.verticalNormalizedPosition = StashScrollPosition;
+            scrollRect.onValueChanged.AddListener(UpdateScrollPosition);
+        }
+
+        private class SimpleStashPanelPatch : ModulePatch
+        {
+            protected override MethodBase GetTargetMethod()
+            {
+                return AccessTools.Method(typeof(SimpleStashPanel), "Show");
+            }
+
+            [PatchPostfix]
+            private static void Postfix(SimpleStashPanel __instance)
+            {
+                SynchronizeScrollRect(__instance);
+            }
+        }
+
+        public class TraderDealScreenPatch : ModulePatch
+        {
+            protected override MethodBase GetTargetMethod()
+            {
+                return AccessTools.Method(typeof(TraderDealScreen), "method_3");
+            }
+
+            // TraderDealScreen is a monstrosity that loads multiple times and isn't done loading when Show() is done
+            // method_3 shows the stash grid, if method_5() returned true
+            [PatchPostfix]
+            private static void Postfix(TraderDealScreen __instance, ScrollRect ____stashScroll)
+            {
+                if (__instance.method_5())
+                {
+                    SynchronizeScrollRect(__instance, ____stashScroll);
+                }
+            }
+        }
+
+        public class AddOfferWindowPatch : ModulePatch
+        {
+            protected override MethodBase GetTargetMethod()
+            {
+                return AccessTools.Method(typeof(AddOfferWindow), "Show");
+            }
+
+            [PatchPostfix]
+            private static void Postfix(AddOfferWindow __instance)
+            {
+                SynchronizeScrollRect(__instance);
+            }
+        }
+    }
+}

Plugin.cs

@@ -23,6 +23,7 @@ namespace UIFixes
             DialogPatches.Enable();
             ItemPanelResizePatches.Enable();
             ProductionPanelPatches.Enable();
+            ScrollSyncPatches.Enable();
         }
     }
 }

Settings.cs

@@ -40,6 +40,7 @@ namespace UIFixes
         // Inventory
         public static ConfigEntry<bool> SwapItems { get; set; }
         public static ConfigEntry<bool> SwapImpossibleContainers { get; set; }
+        public static ConfigEntry<bool> SynchronizeStashScrolling { get; set; }
         public static ConfigEntry<bool> MergeFIRMoney { get; set; }
         public static ConfigEntry<bool> MergeFIRAmmo { get; set; }
         public static ConfigEntry<bool> MergeFIROther { get; set; }
@@ -126,6 +127,15 @@ namespace UIFixes
                     null,
                     new ConfigurationManagerAttributes { })));
 
+            configEntries.Add(SynchronizeStashScrolling = config.Bind(
+                InventorySection,
+                "Synchronize Stash Scroll Position",
+                false,
+                new ConfigDescription(
+                    "Remember your scroll position all the places you see your stash - inventory, trading screen, mail screen, etc.",
+                    null,
+                    new ConfigurationManagerAttributes { })));
+
             configEntries.Add(MergeFIRMoney = config.Bind(
                 InventorySection,
                 "Autostack Money with FiR Money",