Paper/nms-patches/ContainerSmithing.patch

--- a/net/minecraft/server/ContainerSmithing.java
+++ b/net/minecraft/server/ContainerSmithing.java
@@ -3,12 +3,17 @@
 import java.util.List;
 import javax.annotation.Nullable;
 
+import org.bukkit.craftbukkit.inventory.CraftInventoryView; // CraftBukkit
+
 public class ContainerSmithing extends ContainerAnvilAbstract {
 
     private final World g;
     @Nullable
     private RecipeSmithing h;
     private final List<RecipeSmithing> i;
+    // CraftBukkit start
+    private CraftInventoryView bukkitEntity;
+    // CraftBukkit end
 
     public ContainerSmithing(int i, PlayerInventory playerinventory) {
         this(i, playerinventory, ContainerAccess.a);
@@ -68,4 +73,18 @@
             return recipesmithing.a(itemstack);
         });
     }
+
+    // CraftBukkit start
+    @Override
+    public CraftInventoryView getBukkitView() {
+        if (bukkitEntity != null) {
+            return bukkitEntity;
+        }
+
+        org.bukkit.craftbukkit.inventory.CraftInventory inventory = new org.bukkit.craftbukkit.inventory.CraftInventorySmithing(
+                this.repairInventory, this.resultInventory);
+        bukkitEntity = new CraftInventoryView(this.player.getBukkitEntity(), inventory, this);
+        return bukkitEntity;
+    }
+    // CraftBukkit end
 }