Option to keep AddOffer window open

Patches/KeepOfferWindowOpenPatches.cs

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+using Aki.Reflection.Patching;
+using EFT.UI.Ragfair;
+using HarmonyLib;
+using System.Reflection;
+using System.Threading.Tasks;
+
+namespace UIFixes
+{
+    public static class KeepOfferWindowOpenPatches
+    {
+        private static bool BlockClose = false;
+
+        public static void Enable()
+        {
+            new PlaceOfferClickPatch().Enable();
+            new ClosePatch().Enable();
+            new ManageTaskPatch().Enable();
+        }
+
+        public class PlaceOfferClickPatch : ModulePatch
+        {
+            protected override MethodBase GetTargetMethod()
+            {
+                return AccessTools.Method(typeof(AddOfferWindow), nameof(AddOfferWindow.method_1));
+            }
+
+            [PatchPrefix]
+            public static void Prefix()
+            {
+                BlockClose = Settings.KeepAddOfferOpen.Value;
+            }
+
+            [PatchPostfix]
+            public static void Postfix()
+            {
+                BlockClose = false;
+            }
+        }
+
+        public class ClosePatch : ModulePatch
+        {
+            protected override MethodBase GetTargetMethod()
+            {
+                return AccessTools.Method(typeof(AddOfferWindow), nameof(AddOfferWindow.Close));
+            }
+
+            [PatchPrefix]
+            public static bool Prefix()
+            {
+                return !BlockClose;
+            }
+        }
+
+        // The window has a task completion source that completes when closing window or upon successful offer placement (which assumes window closes too)
+        // Replace implementation to ensure it only completes when window is closed, or placement is successful AND window has since closed
+        public class ManageTaskPatch : ModulePatch
+        {
+            protected override MethodBase GetTargetMethod()
+            {
+                return AccessTools.Method(typeof(AddOfferWindow), nameof(AddOfferWindow.method_16));
+            }
+
+            [PatchPrefix]
+            public static bool Prefix(AddOfferWindow __instance, TaskCompletionSource<object> ___taskCompletionSource_0, ref bool ___bool_2)
+            {
+                if (!Settings.KeepAddOfferOpen.Value)
+                {
+                    return true;
+                }
+
+                ___bool_2 = false;
+                if (!__instance.gameObject.activeInHierarchy)
+                {
+                    ___taskCompletionSource_0.SetResult(null);
+                }
+
+                return false;
+            }
+        }
+    }
+}