SPIGOT-6078: Add SmithItemEvent and expand SmithingInventory API

By: Julian van den Berkmortel <julianvdberkmortel@outlook.com>

paper-server/nms-patches/net/minecraft/world/inventory/ContainerSmithing.patch

@@ -18,7 +18,7 @@
  
      public ContainerSmithing(int i, PlayerInventory playerinventory) {
          this(i, playerinventory, ContainerAccess.a);
-@@ -63,13 +68,13 @@
+@@ -63,13 +68,16 @@
          List<RecipeSmithing> list = this.g.getCraftingManager().b(Recipes.SMITHING, this.repairInventory, this.g);
  
          if (list.isEmpty()) {
@@ -30,11 +30,14 @@
  
              this.resultInventory.a((IRecipe) this.h);
 -            this.resultInventory.setItem(0, itemstack);
-+            org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareSmithingEvent(getBukkitView(), itemstack); // CraftBukkit
++            // CraftBukkit start
++            this.repairInventory.setCurrentRecipe(this.h);
++            org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareSmithingEvent(getBukkitView(), itemstack);
++            // CraftBukkit end
          }
  
      }
-@@ -85,4 +90,18 @@
+@@ -85,4 +93,18 @@
      public boolean a(ItemStack itemstack, Slot slot) {
          return slot.inventory != this.resultInventory && super.a(itemstack, slot);
      }