PaperMC/nms-patches/CraftingManager.patch

--- a/net/minecraft/server/CraftingManager.java
+++ b/net/minecraft/server/CraftingManager.java
@@ -20,7 +20,7 @@
     private static final Logger c = LogManager.getLogger();
     public static final int a = "recipes/".length();
     public static final int b = ".json".length();
-    public Map<MinecraftKey, IRecipe> recipes = Maps.newHashMap();
+    public it.unimi.dsi.fastutil.objects.Object2ObjectLinkedOpenHashMap<MinecraftKey, IRecipe> recipes = new it.unimi.dsi.fastutil.objects.Object2ObjectLinkedOpenHashMap<>(); // CraftBukkit
     private boolean e;
 
     public CraftingManager() {}
@@ -84,7 +84,7 @@
         if (this.recipes.containsKey(irecipe.getKey())) {
             throw new IllegalStateException("Duplicate recipe ignored with ID " + irecipe.getKey());
         } else {
-            this.recipes.put(irecipe.getKey(), irecipe);
+            this.recipes.putAndMoveToFirst(irecipe.getKey(), irecipe); // CraftBukkit - SPIGOT-4638: last recipe gets priority
         }
     }
 
@@ -95,12 +95,14 @@
 
         do {
             if (!iterator.hasNext()) {
+                iinventory.setCurrentRecipe(null); // CraftBukkit - Clear recipe when no recipe is found
                 return ItemStack.a;
             }
 
             irecipe = (IRecipe) iterator.next();
         } while (!irecipe.a(iinventory, world));
 
+        iinventory.setCurrentRecipe(irecipe); // CraftBukkit
         return irecipe.craftItem(iinventory);
     }
 
@@ -112,12 +114,14 @@
 
         do {
             if (!iterator.hasNext()) {
+                iinventory.setCurrentRecipe(null); // CraftBukkit - Clear recipe when no recipe is found
                 return null;
             }
 
             irecipe = (IRecipe) iterator.next();
         } while (!irecipe.a(iinventory, world));
 
+        iinventory.setCurrentRecipe(irecipe); // CraftBukkit
         return irecipe;
     }