Bypass ghost slot when we're dealing with a filter

src/main/java/com/raoulvdberge/refinedstorage/container/ContainerBase.java

@@ -1,5 +1,6 @@
 package com.raoulvdberge.refinedstorage.container;
 
+import com.raoulvdberge.refinedstorage.RSItems;
 import com.raoulvdberge.refinedstorage.apiimpl.API;
 import com.raoulvdberge.refinedstorage.container.slot.*;
 import com.raoulvdberge.refinedstorage.tile.TileBase;
@@ -59,13 +60,15 @@ public abstract class ContainerBase extends Container {
         Slot slot = id >= 0 ? getSlot(id) : null;
 
         if (slot instanceof SlotFilter) {
+            if (slot.getStack().getItem() == RSItems.FILTER) {
+                return super.slotClick(id, dragType, clickType, player);
+            }
+
             if (((SlotFilter) slot).allowsSize()) {
                 if (clickType == ClickType.QUICK_MOVE) {
                     slot.putStack(ItemStack.EMPTY);
                 } else if (!player.inventory.getItemStack().isEmpty()) {
-                    int amount = player.inventory.getItemStack().getCount();
+                    slot.putStack(player.inventory.getItemStack().copy());
-
-                    slot.putStack(ItemHandlerHelper.copyStackWithSize(player.inventory.getItemStack(), amount));
                 } else if (slot.getHasStack()) {
                     int amount = slot.getStack().getCount();
 
@@ -80,6 +83,10 @@ public abstract class ContainerBase extends Container {
             } else if (player.inventory.getItemStack().isEmpty()) {
                 slot.putStack(ItemStack.EMPTY);
             } else if (slot.isItemValid(player.inventory.getItemStack())) {
+                if (player.inventory.getItemStack().getItem() == RSItems.FILTER) {
+                    return super.slotClick(id, dragType, clickType, player);
+                }
+
                 slot.putStack(player.inventory.getItemStack().copy());
             }
 
@@ -118,6 +125,10 @@ public abstract class ContainerBase extends Container {
                 slot.putStack(ItemHandlerHelper.copyStackWithSize(stack, 1));
                 slot.onSlotChanged();
 
+                if (stack.getItem() == RSItems.FILTER) {
+                    stack.setCount(0);
+                }
+
                 return ItemStack.EMPTY;
             }
         }

src/main/java/com/raoulvdberge/refinedstorage/container/slot/SlotFilter.java

@@ -1,5 +1,6 @@
 package com.raoulvdberge.refinedstorage.container.slot;
 
+import com.raoulvdberge.refinedstorage.RSItems;
 import net.minecraft.block.state.IBlockState;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.init.Blocks;
@@ -30,7 +31,7 @@ public class SlotFilter extends SlotItemHandler {
 
     @Override
     public boolean canTakeStack(EntityPlayer player) {
-        return false;
+        return getStack().getItem() == RSItems.FILTER;
     }
 
     @Override