PaperMC/patches/server/0751-Fix-removing-recipes-from-RecipeIterator.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake <jake.m.potrebic@gmail.com>
Date: Tue, 30 Nov 2021 12:01:56 -0800
Subject: [PATCH] Fix removing recipes from RecipeIterator

== AT ==
public net.minecraft.world.item.crafting.RecipeManager byName

diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/RecipeIterator.java b/src/main/java/org/bukkit/craftbukkit/inventory/RecipeIterator.java
index 24f336c89b548c5ba2a95372db0d7c83b5c4ec47..91895c639c33a1cafd2a35bab7b5fd83e558468d 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/RecipeIterator.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/RecipeIterator.java
@@ -11,6 +11,7 @@ import org.bukkit.inventory.Recipe;
 public class RecipeIterator implements Iterator<Recipe> {
     private final Iterator<Map.Entry<RecipeType<?>, Object2ObjectLinkedOpenHashMap<ResourceLocation, net.minecraft.world.item.crafting.Recipe<?>>>> recipes;
     private Iterator<net.minecraft.world.item.crafting.Recipe<?>> current;
+    private Recipe currentRecipe; // Paper - fix removing recipes
 
     public RecipeIterator() {
         this.recipes = MinecraftServer.getServer().getRecipeManager().recipes.entrySet().iterator();
@@ -34,10 +35,16 @@ public class RecipeIterator implements Iterator<Recipe> {
     public Recipe next() {
         if (this.current == null || !this.current.hasNext()) {
             this.current = this.recipes.next().getValue().values().iterator();
-            return this.next();
+            // Paper start - fix removing recipes
+            this.currentRecipe = this.next();
+            return this.currentRecipe;
+            // Paper end
         }
 
-        return this.current.next().toBukkitRecipe();
+        // Paper start - fix removing recipes
+        this.currentRecipe = this.current.next().toBukkitRecipe();
+        return this.currentRecipe;
+        // Paper end
     }
 
     @Override
@@ -46,6 +53,11 @@ public class RecipeIterator implements Iterator<Recipe> {
             throw new IllegalStateException("next() not yet called");
         }
 
+        // Paper start - fix removing recipes
+        if (this.currentRecipe instanceof org.bukkit.Keyed keyed) {
+            MinecraftServer.getServer().getRecipeManager().byName.remove(org.bukkit.craftbukkit.util.CraftNamespacedKey.toMinecraft(keyed.getKey()));
+        }
+        // Paper end
         this.current.remove();
     }
 }