Fix leaking client-side enchantment cost prediction in AnvilWindow

Author: NichtStudioCode

invui/src/main/java/xyz/xenondevs/invui/internal/menu/CustomAnvilMenu.java

@@ -4,6 +4,7 @@
 import net.minecraft.network.protocol.game.ServerboundRenameItemPacket;
 import net.minecraft.world.inventory.MenuType;
 import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
 import org.jspecify.annotations.Nullable;
 import xyz.xenondevs.invui.internal.network.PacketListener;
 
@@ -14,6 +15,8 @@
  */
 public class CustomAnvilMenu extends CustomContainerMenu {
 
+    private static final int ENCHANTMENT_COST_DIRTY_MARKER = Integer.MIN_VALUE;
+    
     private String renameText = "";
     private @Nullable Consumer<? super String> renameHandler;
 
@@ -40,11 +43,22 @@ public void handleClosed() {
         super.handleClosed();
     }
 
+    @Override
+    public void setItem(int slot, @Nullable ItemStack item) {
+        super.setItem(slot, item);
+        
+        // updating second input slot causes client-side prediction of enchantment cost
+        if (slot == 1) {
+            remoteDataSlots[0] = ENCHANTMENT_COST_DIRTY_MARKER;
+        }
+    }
+    
     private void handleRename(ServerboundRenameItemPacket packet) {
         renameText = packet.getName();
         if (renameHandler != null)
             renameHandler.accept(renameText);
         remoteItems.set(2, DIRTY_MARKER);
+        remoteDataSlots[0] = ENCHANTMENT_COST_DIRTY_MARKER;
     }
 
     /**