SPIGOT-6557: PlayerEditBookEvent#setNewBookMeta does not update meta

By: md_5 <git@md-5.net>

paper-server/nms-patches/net/minecraft/server/network/PlayerConnection.patch

@@ -384,7 +384,7 @@
  
          if (itemstack.a(Items.WRITABLE_BOOK)) {
 -            this.a(list, UnaryOperator.identity(), itemstack);
-+            this.a(list, UnaryOperator.identity(), itemstack, i, itemstack.cloneItemStack()); // CraftBukkit
++            this.a(list, UnaryOperator.identity(), itemstack.cloneItemStack(), i, itemstack); // CraftBukkit
          }
      }
  
@@ -393,13 +393,14 @@
              this.a(list, (s) -> {
                  return IChatBaseComponent.ChatSerializer.a((IChatBaseComponent) (new ChatComponentText(s)));
 -            }, itemstack1);
+-            this.player.getInventory().setItem(i, itemstack1);
 +            }, itemstack1, i, itemstack); // CraftBukkit
-             this.player.getInventory().setItem(i, itemstack1);
++            this.player.getInventory().setItem(i, itemstack); // CraftBukkit - event factory updates the hand book
          }
      }
  
 -    private void a(List<ITextFilter.a> list, UnaryOperator<String> unaryoperator, ItemStack itemstack) {
-+    private void a(List<ITextFilter.a> list, UnaryOperator<String> unaryoperator, ItemStack itemstack, int slot, ItemStack old) { // CraftBukkit
++    private void a(List<ITextFilter.a> list, UnaryOperator<String> unaryoperator, ItemStack itemstack, int slot, ItemStack handItem) { // CraftBukkit
          NBTTagList nbttaglist = new NBTTagList();
  
          if (this.player.R()) {
@@ -412,7 +413,7 @@
          }
  
          itemstack.a("pages", (NBTBase) nbttaglist);
-+        CraftEventFactory.handleEditBookEvent(player, slot, old, itemstack); // CraftBukkit
++        CraftEventFactory.handleEditBookEvent(player, slot, handItem, itemstack); // CraftBukkit
      }
  
      @Override