Server side only item callback: allow a held item to decide if it wants to pass sneak-clicks through

to a block, or not. Defaults false- the same as the new vanilla behaviour (sneak clicks with an item
in hand don't activateBlock anymore).

patches/minecraft/net/minecraft/item/Item.java.patch

@@ -18,17 +18,16 @@
  
  public class Item
  {
-@@ -229,6 +232,9 @@
- 
+@@ -230,18 +233,26 @@
      /** full name of item from language file */
      private String itemName;
-+    
+ 
 +    /** FORGE: To disable repair recipes. */
 +    protected boolean canRepair = true;
- 
++
      public Item(int par1)
      {
-@@ -236,12 +242,17 @@
+         this.shiftedIndex = 256 + par1;
  
          if (itemsList[256 + par1] != null)
          {
@@ -58,7 +57,7 @@
          Vec3 var23 = var13.addVector((double)var18 * var21, (double)var17 * var21, (double)var20 * var21);
          return par1World.rayTraceBlocks_do_do(var13, var23, par3, !par3);
      }
-@@ -701,4 +716,289 @@
+@@ -701,4 +716,304 @@
      {
          StatList.initStats();
      }
@@ -346,5 +345,20 @@
 +                    original.theMaximumChanceToGenerateItem, original.itemWeight);
 +        }
 +        return original;
++    }
++
++    /**
++     *
++     * Should this item, when held, allow sneak-clicks to pass through to the underlying block?
++     *
++     * @param par2World
++     * @param par4
++     * @param par5
++     * @param par6
++     * @return
++     */
++    public boolean shouldPassSneakingClickToBlock(World par2World, int par4, int par5, int par6)
++    {
++        return false;
 +    }
  }

patches/minecraft/net/minecraft/item/ItemInWorldManager.java.patch

@@ -180,7 +180,7 @@
 +        Block block = Block.blocksList[var11];
 +        boolean result = false;
 +
-+        if (block != null && (!par1EntityPlayer.isSneaking() || par1EntityPlayer.getHeldItem() == null))
++        if (block != null && (!par1EntityPlayer.isSneaking() || ( par1EntityPlayer.getHeldItem() == null || par1EntityPlayer.getHeldItem().getItem().shouldPassSneakingClickToBlock(par2World, par4, par5, par6))))
 +        {
 +            if (event.useBlock != Event.Result.DENY)
 +            {