SPIGOT-1984: Fix default interact state when sneaking

nms-patches/PlayerInteractManager.patch

@@ -226,11 +226,11 @@
          if (this.gamemode == WorldSettings.EnumGamemode.SPECTATOR) {
              TileEntity tileentity = world.getTileEntity(blockposition);
  
-@@ -329,6 +464,72 @@
+@@ -329,6 +464,74 @@
                  return itemstack.placeItem(entityhuman, world, blockposition, enumhand, enumdirection, f, f1, f2);
              }
          }
-+        // Interract event */
++        // Interact event */
 +        IBlockData blockdata = world.getType(blockposition);
 +        EnumInteractionResult result = EnumInteractionResult.FAIL;
 +        if (blockdata.getBlock() != Blocks.AIR) {
@@ -239,6 +239,8 @@
 +            if (this.gamemode == WorldSettings.EnumGamemode.SPECTATOR) {
 +                TileEntity tileentity = world.getTileEntity(blockposition);
 +                cancelledBlock = !(tileentity instanceof ITileInventory || tileentity instanceof IInventory);
++            } else {
++                cancelledBlock = !(!entityhuman.isSneaking() || entityhuman.getItemInMainHand() == null && entityhuman.getItemInOffHand() == null); // From above
 +            }
 +
 +            if (!entityhuman.getBukkitEntity().isOp() && itemstack != null && Block.asBlock(itemstack.getItem()) instanceof BlockCommand) {