Fixed bug where the previews for mutations with lists in their plots

could get a repeat permutation.

Scripts/Garden/MutationRecipePreview.js

@@ -4,6 +4,7 @@ let MutationRecipePreviewFrame = 0;
 let MutationRecipePreviewTimer = null;
 
 const MutationRecipePreviewCells = new Set();
+const MutationRecipePreviewPermutations = new Map();
 
 
 function GetMutationRecipePreviewListReference(
@@ -419,16 +420,25 @@ function CreateMutationRecipePreviewPermutation(
     ListNumber,
     Frame
 ) {
+    const CacheKey =
+        ListNumber + ":" + ItemCount;
+
+    const Cached =
+        MutationRecipePreviewPermutations.get(
+            CacheKey
+        );
+
+    if (Cached?.Frame === Frame) {
+        return Cached.Permutation;
+    }
+
     const Permutation =
         Array.from(
             { length: ItemCount },
             (_, Index) => Index
         );
 
-    if (ItemCount < 2 || Frame === 0) {
+    if (ItemCount >= 2 && Frame !== 0) {
-        return Permutation;
-    }
-
         let State =
             (
                 Math.imul(
@@ -470,6 +480,33 @@ function CreateMutationRecipePreviewPermutation(
                 Permutation[Index]
             ];
         }
+    }
+
+    if (
+        ItemCount >= 2 &&
+        Cached?.Frame === Frame - 1 &&
+        Permutation.every(
+            (Value, Index) =>
+                Value ===
+                Cached.Permutation[Index]
+        )
+    ) {
+        [
+            Permutation[0],
+            Permutation[1]
+        ] = [
+            Permutation[1],
+            Permutation[0]
+        ];
+    }
+
+    MutationRecipePreviewPermutations.set(
+        CacheKey,
+        {
+            Frame: Frame,
+            Permutation: Permutation
+        }
+    );
 
     return Permutation;
 }