fix calculation of item count in bulk filter item

#264

Author: desht

src/main/java/me/desht/modularrouters/container/handler/BaseModuleHandler.java

@@ -9,10 +9,12 @@
 import net.minecraft.core.component.DataComponentType;
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.item.component.ItemContainerContents;
+import net.neoforged.neoforge.items.IItemHandler;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import java.util.List;
+import java.util.function.BiFunction;
 import java.util.stream.IntStream;
 
 public abstract class BaseModuleHandler extends GhostItemHandler {
@@ -74,8 +76,8 @@ protected void onContentsChanged(int slot) {
      *
      * @return number of items in the filter
      */
-    public static int getFilterItemCount(ItemStack holderStack) {
-        ModuleFilterHandler handler = new ModuleFilterHandler(holderStack, null);
+    public static int getFilterItemCount(ItemStack holderStack, BiFunction<ItemStack, ModularRouterBlockEntity, BaseModuleHandler> factory) {
+        BaseModuleHandler handler = factory.apply(holderStack, null);
         return (int) IntStream.range(0, handler.getSlots())
                 .filter(i -> !handler.getStackInSlot(i).isEmpty())
                 .count();

src/main/java/me/desht/modularrouters/item/smartfilter/BulkItemFilter.java

@@ -60,7 +60,7 @@ public InteractionResult useOn(UseOnContext ctx) {
 
     @Override
     public int getSize(ItemStack filterStack) {
-        return BaseModuleHandler.getFilterItemCount(filterStack);
+        return BaseModuleHandler.getFilterItemCount(filterStack, BulkFilterHandler::new);
     }
 
     private InteractionResult handleUseServerSide(UseOnContext ctx) {