Fix Item transfers related to Hoppers.

src/main/java/net/minecraftforge/items/VanillaHopperItemHandler.java

@@ -40,16 +40,16 @@ public class VanillaHopperItemHandler extends InvWrapper
     public ItemStack insertItem(int slot, @Nonnull ItemStack stack, boolean simulate)
     {
         if (stack.func_190926_b())
-            return null;
-//        if (simulate || !hopper.mayTransfer())
-//            return super.insertItem(slot, stack, simulate);
+            return ItemStack.field_190927_a;
+        if (simulate || !hopper.mayTransfer())
+            return super.insertItem(slot, stack, simulate);
 
         int curStackSize = stack.func_190916_E();
         ItemStack itemStack = super.insertItem(slot, stack, false);
-//        if (itemStack == null || curStackSize != itemStack.func_190916_E())
-//        {
-//            hopper.setTransferCooldown(8);
-//        }
+        if (itemStack.func_190926_b() || curStackSize != itemStack.func_190916_E())
+        {
+            hopper.setTransferCooldown(8);
+        }
         return itemStack;
     }
 }

src/main/java/net/minecraftforge/items/VanillaInventoryCodeHooks.java

@@ -120,7 +120,7 @@ public class VanillaInventoryCodeHooks
         for (int i = 0; i < hopper.getSizeInventory(); i++)
         {
             ItemStack stackInSlot = hopper.getStackInSlot(i);
-            if (stackInSlot.func_190926_b())
+            if (!stackInSlot.func_190926_b())
             {
                 ItemStack insert = stackInSlot.copy();
                 insert.func_190920_e(1);

src/main/java/net/minecraftforge/items/wrapper/InvWrapper.java

@@ -93,7 +93,7 @@ public class InvWrapper implements IItemHandlerModifiable
                 if (!simulate)
                 {
                     ItemStack copy = stack.copy();
-                    copy.func_190918_g(stackInSlot.func_190916_E());
+                    copy.func_190917_f(stackInSlot.func_190916_E());
                     getInv().setInventorySlotContents(slot, copy);
                     getInv().markDirty();
                 }